Gm 10 Bolt Gear Ratio Identification

That would be an extremely rare axle to find under a 4 door unless someone ordered your car with an L79 engine option. For example on a 4. Example: BL 1122 G2 For a 68 or 69 model, this is interpreted as a 3. If your classic muscle car already has one of the Buick or Pontiac 8. 5" ring gear was used in Chevelles. 10-Bolt Builder’s Guide GM's Mid Duty Axle Not only do you get a 9. 6" ring gear, Ratio option GU6, With G80 posi traction. This will help you pick the right size tires, transmission and gear ratio combination for your classic. Here is a listing of production GM vehicles that have flexible couplings that will adapt your steering column to the new steering gear with a 3/4 input shaft. bolt and the Dana 70. Please select a rear end that matches your vehicle below. Items may be different than pictured. It uses the B-O-P bellhousing bolt pattern which makes it compatible with nearly any GM engine. T-10 and T-89 bolt patterns look very similar also to ’49-’64 Ford pattern. Currie 12-bolt Rearends for 64-72 A-body vehicles are complete, ready to bolt-in assemblies, with a choice of popular differential type, gear ratio and brake options, making it easy to customize the package to meet almost any need. The rear does appear to be a 8. 5 ring gear, 3. Axle has 4. this means that dimension "C" is usually longer than dimension "B". 10 Ratio Ring and Pinion - 2-2021-410. 2-inch or the 12-bolt 8. 373 gear ratio regardless of trans. T-10-V, close ratio, was used '69 and up. 36:1 and up gear ratios. I belive there where two Gear Ratios that You could get from the Factory with the Tow Package. USA STANDARD GEAR SETS BY YUKON: ZG GM14T-373: GM 10. GM Authority is a must-read for GM news, GM rumors, GM reviews, and information about General Motors vehicles. , 1/4" wall), custom alloy axles (30, 33, or 35 spline. Axle Model and get Free Shipping on Orders Over $99 at Summit Racing!. Rear Axle 11. After mountain towing a camper I want to switch to 4. 5″ Rear-end; How To Install Ring and Pinion Gears in a Ford 8. The following is an article written by Ray Waldbaum. Rear Diffeial Gear Ratio Identification Blazer Forum. The input shaft measures at 6-1/2" in length with 1-1/8" 10 spline. Make sure the transmission is in 5th gear. AllieCat Customs 95,482 views. 25 Alum Bolt Thru Center Section, 35 Spline Spool 9310 Pro Spline Bolt 9310 Spool Thru Center Us Gear 35 Alum 3. 73:1 ratio to a 4. It was eventually replaced by the 4L80E. Traditional BOM’s are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61. My 2001 has a Tow package and I it came with like 3. using Moser Engineering owned Casting Boxes. 2 is garbage, but I've heard the BOP 8. You'll notice that the chart contains a few abbreviations. The Moser Engineering GM 12 Bolt: The strongest 12 bolt rear end for the 1970-1981 F-Body Camaro and Firebird on the market! The newly cast nodular iron housing is a direct replacement 12 bolt rear end for the 1970-1981 F-Body Camaro and Firebird. 2" 10-Bolt May consider trades, let me know what you have. 2" Posi / Gear Package * More Pictures Below * Auction Includes: * BRAND NEW Chevy 8. 2" 10 bolt rear end that was in a 69 Camaro. Edelbrock Crate Engines are 100% brand new and utilize our proven Power Package formulas to offer breathtaking performance right out of the box. No calls, text only. 32 Winters Ring And Pinion 4. I just wanted to stop by and let you know that GM Customer Care is here on the forum and are more then happy to answers questions just like your question regarding gear ratio. Remanufactured differential. Use these gear ratio calculators to custom tailor Richmond Gear products to your vehicle. we do not know the gear ratio or what years it will fit. Bmw 3 Series E36 316 318 320 323 325 X2 Front Wheel Bearing W Abs Ring 90. 5 till 1981 when the 8 lug 9. RANDYS carries GM differentials from the small 6. T-10T, wide ratio, was used briefly. The groove count of the four common T10 first gear ratios are as follows: the 2. -the thicker the gear the better the performance ratio, thinner the gear= less performance, more fuel economy and better highway performance. These units are factory set up with correct shims, torque specifications using correct parts including bearings, races and seals plus crush collar, better that rebuilt units. Chevrolet GM 8. second stage 60 foot pounds. The OEM Carrier 2 gears fit 3. 5-inch ring gear by switching to a 6-lug 14. The 10-bolt differential fits all passenger cars. Schedule a test drive for the Chevrolet 4500 LCF Gas available at Quirk Chevrolet of Bangor. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. If you are looking for help with restoring or hot rodding your chevy classic a good place to go for help is Chevy Talk my favorite forum is 1955-1957 ( Modified / pro street / show) forum. Buy high quality used 2008 Chevy Silverado 1500 Rear Axle Assembly cheap and fast. T-10 and T-89 bolt patterns look very similar also to ’49-’64 Ford pattern. 70 Gear Ratio Differential Identification and Axle. Supply the parts to your mechanic and save money. 38 ratio Yukon Ring & Pinion sets give you the confidence of knowing you're running gears designed for the harshest of conditions. 10 gear ratio. This Week on Everything Off Road we show you an easy way to identify your gear ratio in any Axle Import or Domestic without disassembly. If it happens you don't want the gear ratio, watch for a 14-bolt from a newer truck instead of changing gears out on yours. Corvette Gears; GM 10 Bolt 7. 875" (often rounded to 8. Both of these are semi-floating axles. 36 open 10-bolt BE - 3. 2" 10-Bolt May consider trades, let me know what you have. 5" ring gear, 1. Carrier Casting Numbers. After mountain towing a camper I want to switch to 4. Are you planning on tubbing the car? If not, then just switching to a 4 link will gain you some space for wider tires. 3", whereas a 12 bolt Chevy has a 12 bolt carrier that measures 8. Gear Ratios of Popular GM Transmissions Transmission Identification By Pan The TH200-4R is identified by 10 bolt holes and 2 dowel-pin locator holes on the. New 2020 Chevrolet Traverse Premier Redline 4D Sport Utility for sale - only $47,397. The 6L80E uses four under drive gears and two overdrive gears. Choosing the correct gear ratio is critical to maximizing performance, efficiency and drivability for any kind of vehicle operating under any conditions. 2" Posi / Gear Package * More Pictures Below * Auction Includes: * BRAND NEW Chevy 8. GM differentials come in a wide range of sizes. This pinion gear (left) is a 4. AAM has developed a series of axle and driveshaft components to make it easier for the installer to perform a repair or a complete replacement job. Differential Identification. The basic rule of thumb is that a 2-series differential will only work with gear ratios in the 2 series, as in 2. If it happens you don't want the gear ratio, watch for a 14-bolt from a newer truck instead of changing gears out on yours. 36 open 10-bolt BE - 3. 8 inches, which is noted in the part code: GM8. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. Get the best deals on Differentials & Parts for GMC Canyon 09-15 GM Chevy 8. Rear Axle Identification. Before we start, let's identify the parts. 73 Ratio Gear Set. 00 9 inch Ford, rear ends and parts, housings 31 spline axles. 2" and 12-bolt rearends. New 2020 Chevrolet Bolt EV LT 5D Wagon for sale - only $27,480. 73:1 ring gear fits the GM 12-bolt passenger car carrier. Visit Quirk Chevrolet in Braintree MA serving Boston, Hingham and Newton #3GCNYAEH3LG242493. The form below allows you to search for car, truck, motorcycle or boat parts in real time. trucks had the. CHEVROLET Differential Cover, Polished Aluminum GM 10. Chevy Chevrolet Serial Number Data Tag Id Plate Stamped With Your Information. It will need the speedo recalibrated. OK I got this rearend out of a 66 C10. 25 Front Differential. An easy way to spot a nice ratio after a while is by visual id. Is there a place I can look to find the gear ratio for ther rear end of my 1964 c10 stepside truck? It has a 12 bolt rear end in it. A 10 bolt of that era will have a alpa numerical code stamped high on pass side tube that will tell you exactly what car it is out of, gear ratio and if its a posi. Package includes; New Moser 12-Bolt Made in the U. First appearing in the 1970 as a corporate replacement for the 10-bolt 8. 5" 10 bolt is probably the strongest of the 10 bolt GM's and not much less than the 12 bolt. 2-inch units. And gear oil will work. GM / Chevy - Differential Identification Shop by your differential. 2019 and newer models: May use a similar 12 bolt rear cover that is slightly larger and not compatible with this cover. The GM 10 Bolt front axle was used on Chevy and GMC 1/2 ton and 3/4 ton 4x4 pickups from 1977 to 1987 and on Blazer/Jimmy, and Suburban SUVs from 1977 through 1991. 50" axles are night and day. You can either get a machine shop to enlarge this hole or use a special pinion bearing and race. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods. your obviously going to need to consider tire diameter, rear gear ratio and transmission gearing, generally your want the first gear in the transmission multiplied times the rear differential gear ratio to fall in the 10:1-10. By changing the ratio of just the head set (input shaft and front of the countergear) you can change the overall ratio. From 1964 through 1970 the format for the rear axle information consisted of a 2-letter code for the ratio, a 4-digit number for the month/year, and a single letter for the rear axle assembly plant. The OEM Carrier 2 gears fit 3. T-10 was used almost by every US car company in some point in time. 2-inch or the 12-bolt 8. Divide the 41 by the 11, this gives you a 3. 5" Ring and Pinion Gear Set • 10 Bolt • 7. Some trucks have the 10 bolt cover (see our GM 10 Bolt Cover). 2 Pinion Spline Count: 25 Ring & Pinion Gear Ratio: 4. 00 ratio (thinner gear), the other from a 3. My 2001 has a Tow package and I it came with like 3. Chevrolet GM 8. From a single rear wheel one ton Chevy. I do not answer unrecognizable numbers. The first (and I'm assuming original) rear axle differential assembly was in the dump bed when I purchased the truck. Eckler's Corvette has a wide selection of Corvette differential parts, and rear differentials. 11 gearing used on most early GM pickups. 73 Ratio Fits 08-12 Ford F350sd Pickup 378800. 60-1/4" wheel mounting to wheel mounting surface, 3. 73 and changed it to 3. ***Call Zumbrota Bearing and Gear at 1-800-658-2537 ext 125 for customer service, availability and technical assistance***. 10 and Numerically Lower Gear Ratio. i will guess 4. 2000 F250 Diesel, rear axle,sterling. Saginaw Steering Boxes are preferred for your build it allows us to use quicker ratios and 0-mile parts – this is what makes Saginaw’s better by design. In other cases, people will swap in a 12 bolt, or upgrade to 3/4 ton running gear for strength. 5" 10 bolt ring gear is not the same as the 1971 and newer 10 bolts). The LS3 is filled with components designed for high performance and longevity. Sometimes referred to as the GM 10-bolt. 5" 10-bolt rearend began production in 1971 to replace the 8. I want something with less mileage, so I'm wondering if their is a compatible late model chevy rear end I can use, even if the ratio is different. 2-inch 10-bolt differentials, several manufacturers have aftermarket upgrade parts available to change the ratio, add limited-slip or full-locking carriers and improve the assembly's durability. 8 inches, which is noted in the part code: GM8. Axle Model and get Free Shipping on Orders Over $99 at Summit Racing!. 5" Ring and Pinion Gear Set • 10 Bolt • 7. /4l80e/and the 9. AllieCat Customs 95,482 views. 2" Eaton-Style (Clutch) Posi Unit (28 Spline) * BRAND NEW Chevy 8. 2" 10 bolt rear end that was in a 69 Camaro. USA STANDARD GEAR SETS BY YUKON: ZG GM14T-373: GM 10. 5″ Rear End February 20, 2019 Roadkill Customs How To & DIY Tinman 2 Kustoms shows how to rebuild a 10 bolt Chevy 8. F350 Sterling, fits 97 diesel model, 3. For best results, please be specific and be patient. This unit does not include backing plates as shown in the picture. (441) 7 bolt side cover ford 3+1 overdrive ford/mercury (435) borg-warner torque tube tailshaft,. 2; GM 10 Bolt 8. OK I got this rearend out of a 66 C10. org members. It uses the B-O-P bellhousing bolt pattern which makes it compatible with nearly any GM engine. ID a 14 bolt rear and gear ratio #33483 Wed Jan 22 2003 11:12 PM: I was wondering why they did not have the GM rear end that was used from the early `40s until. 5", common under 3/4 and 1 ton trucks from Chevrolet and GMC. 2" 10 bolt rear end that was in a 69 Camaro. Do the same on the drive shaft or output shaft. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). Axle has 4. 50" axles are night and day. 625-inches to give it strength. I have a 77 chevy pickup c/10, and i was wondering what the stock rear end gear ratio should be, and how to determine - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. 75 Gears; Mopar Install Kits Lighten Gear Service; Microblue Service; Gear Ratio Calculator; Gears Application Guide; Install Kits and Gears Sets Listed By Rear End. Wiki User The rear gear ratio of a 1989 Chevy Cheyenne truck is between 2. Quality & Customer Service Distributor Support Warranty Info About Yukon Calculators Product. 50 Ring Gear 3. 5 10 bolt gear setup and final assembly - Duration: 17:30. The 1970 12 bolt version will bolt into any second generation Camaro and quite often is done so in high power applications. First appearing in the 1970 as a corporate replacement for the 10-bolt 8. 50" are only Full-Floaters. 3", whereas a 12 bolt Chevy has a 12 bolt carrier that measures 8. The gear ratio codes are located on the front passenger side of the differential as shown in the illustration below. I just wanted to stop by and let you know that GM Customer Care is here on the forum and are more then happy to answers questions just like your question regarding gear ratio. F350 Sterling, fits 97 diesel model, 3. 2", then they are not far off, but the 8. 5; GM 12 Bolt 8. 73:1 ring gear fits the GM 12-bolt passenger car carrier. 30 Motive Gear Ring Pinion Gear Set w/ Install Kit Limited Slip Posi. Overdrive … Continue reading GM 4-Speed Manual →. Front End Axle Assembly 2009-2010 09-10 Jeep Wrangler Dana 30 3. 50 Ring Gear 3. 5" 14 Bolt 3. I just wanted to stop by and let you know that GM Customer Care is here on the forum and are more then happy to answers questions just like your question regarding gear ratio. 2 ring gear Limited Slip Gear Ratio is 3. 55 gear ratio, limited slip $450 04 Chevy 2500 8 lug semi float 4. 1350 series yolk size. Looking for a late model compatible rear end for a 3. Chevelle Tech > Team Chevelle > Archives > 2004 > Super T-10 gear ratios 12 Bolt TrueTrac, 4. 75 10 Bolt --. 2 Chevy-style has a round cover with an indentation running across the cover (like the 12-bolt Chevy) and 2 casting projections on the top of the rear. (441) 7 bolt side cover ford 3+1 overdrive ford/mercury (435) borg-warner torque tube tailshaft,. Just from the pics it looks fairly wide, which is also in agreement with being Impala. 36 Ring and pinion. AXLE IDENTIFICATION Chevrolet began the manufacture of their own design Front Drive Axles for use on 1/ 2 and 3/ 4 ton (K10 & K20) Four Wheel Drive vehicles. Whether it's on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance. 625-inches to give it strength. 71- Newer 2wd GM trucks use a 5 on 5 lug pattern 71-76 Full Size GM Cars " "" "" "60" 60's GMC and some Chevy's Dana 44 or Dana 60 with leaf springs 6 lug, Gear ratio's 3. 38 ratio Yukon Ring & Pinion sets give you the confidence of knowing you're running gears designed for the harshest of conditions. 5 SF 8-lug 14 bolt rear and 3. 200Cover Bolts: 10Ring Gear Bolts: 10Spline Count: 28Dropout: FalsePinion Support: FalseCa. That tag on upper left around 11:00 position will tell the gear ratio and whether limited slip or not. It was used in IH trucks from the mid 1960s until the mid 1970s. 5" 10-bolt is actually just as strong as a 12-bolt or Ford 9-inch rear, with only a fraction of an inch difference in the ring-gear diameter. 25-INCH Ford's biggest axle comes with semi-floating shafts in 1983-and-newer F-250s, and as a full-floater in F-250HDs and F-350s. I recently put a powerglide in a '66 truck that was originally a 3-speed. trucks had the. 5" 10 bolt is probably the strongest of the 10 bolt GM's and not much less than the 12 bolt. This 5-speed transmission is a selective synchromesh type with five (5) speeds forward and one (1) housed in a cast iron case. Transmission Type. It was a 6 cyl. Available in 3. 73-87 Chevy Pickup RPO's (A - L) This isn't a complete list of all the RPO codes for our trucks. I got a 14 bolt I'm selling, it has stamped on the ring gear 11 41 10 77 Is this 4:10 or 3. These low-geared GM boxes have since been discontinued and are generally much more difficult to obtain. I do not answer unrecognizable numbers. 75 Gears; Mopar Install Kits Lighten Gear Service; Microblue Service; Gear Ratio Calculator; Gears Application Guide; Install Kits and Gears Sets Listed By Rear End. , 1/4" wall), custom alloy axles (30, 33, or 35 spline. 2-inch or the 12-bolt 8. 73 ratio; Replacement rear axles from USA Standard come complete with all differential components in one part number for easy, bolt-on installation. Traditional BOM’s are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61. 5" Ring and Pinion Gear Set • 10 Bolt • 7. 99+ silverado was a mix of disc and drum brakes so those won't bolt up, 00+ tahoe is coil sprung with discs and that won't bolt in either. 50" Ring Gear. 2″ 10 Bolt Using Differential Complete Installation Kit For Chevy 8. chart (continued) saginaw, g. Rear; Ratio: 4. 5" gears, ring and pinions, ring and pinion gear sets, master install kits, pinion kits, mini install kits, axles, ujoints, bearings, air lockers, lockers, triple drilled flange, diff housings, solid spacers, flanges and other GM 10 Bolt 8. Pompano Beach drivers can give us a call to schedule a test drive. 5 Inch 14 Bolt 4. I belive there where two Gear Ratios that You could get from the Factory with the Tow Package. The transmission is 23. The round bolt pattern is similar to that used on the Ford models. B) They use the standard GM bell housing bolt pattern. Which is attached to the carrier by 10 bolts (this 8. Last 3 part numbers indicate gear ratio. Just like a 10-bolt rearend, there should be stamped numbers on the axle tube - on the passenger's side. 75 10 Bolt --. Our inventory includes ring gear and pinion sets, including aftermarket and OE gear sets. 10 Bolt Chevy Identification Guide Know What You Re Looking At. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. 5" Rear - 30 Spline - 10 bolt cover with 8. 2 10 Bolt Differential Parts - Posi Units - Gears - Bearing Kits - 10 bolt cover with 8. The 1970 12 bolt version will bolt into any second generation Camaro and quite often is done so in high power applications. 5" 14 Bolt Gear. Carrier Casting Numbers. chevy rear differential identification. Direct bolt-in fit rearend for 1963 thru 1972 Chevy C10 two-wheel drive trucks with 5 or 6-lug bolt patterns. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). , 1/4" wall), custom alloy axles (30, 33, or 35 spline. At 70 MPH, the motor was turning 2900 RPM. Since both the 8. This pinion gear (left) is a 4. 73:1 ratio to a 4. To find the ratio of any gear combination; count the number of teeth on the pinion gear, and divide that number into the number of teeth on the ring gear, thus 41 divided by 10 = 4. 08 Great shape ****Lower controls are not included*** $350 CASH NO TRADES. The first thing to consider when swapping in a new gear set is the type of rearend your vehicle has. 2" ring gear from 1964 to early 1972. We make it easy to verify your. 10 gear for a 12-bolt Chevy housing that will mount to a 4. Bmw 2000-2003 E39 M5 Oem S62 Ratio 3. 2" Yes! The Buick engineers did their homework! This is not a typical GM 10 Bolt rear end, but one that was designed for the full size LeSabre and adapted to the `68-`70 GS, Skylark, Special and LeSabre as a durable performance model. Ford 4 speed Toploader. reference 4-speed transmission i. 2" 10-Bolt May consider trades, let me know what you have. How do you ID the gear ratio of a 10-bolt rear end and find out if it's posi-traction? Most all rear ends have a code stamped on the axle housing. OK I got this rearend out of a 66 C10. 10 Pinion & Ring Big Case 210 M3 E92 E46 M5 $1,149. AllieCat Customs 95,482 views. 5-inch 10-bolt was used in many different models by every GM division, with the exception of Cadillac, during the 1970s. 2" and 12-bolt rearends. (410) Borg-Warner T-10, GM AS-3 9 bolt curved bottom side cover. 6" ring gear, Ratio option GU4, With G80 posi traction. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). 5 R&P Note: When replacing a stock 2. 5 14 bolt has such huge teeth with very little pinion offset. Eckler's Corvette has a wide selection of Corvette differential parts, and rear differentials. Revolution Gear and Axle GM 8. 2 ring gear. 50" is HUGE!! Drive to the local GM Dealer and take a look. 2 Pontiac 10-bolt has 2 scallops (cutouts) on each side of the rear cover, whereas an 8. It was used in IH trucks from the mid 1960s until the mid 1970s. To determine axle ratio, divide number of ring gear teeth by number of pinion teeth. 73 Ratio Fits 08-12 Ford F350sd Pickup 378800. 2" BOP axle including ring and pinion sets, rebuilt kits and bearings, differential covers, upgraded axle shafts, heavy duty u-joints, and more. GMC V-6 used a 3. 7:1 compression ratio. Using only authentic OE approved and tested parts, Power to Deliver components will provide the proper fit and function required to avoid noise, vibration and harshness that leads to customer satisfaction. We have the opportunity to offer the almost impossable to get 12 bolt 5. All Ford T5s have a bellhousing bolt pattern that looks similar to that of a Top Loader, though it is different. Has a 10 bolt cover as well as 10 bolts securing the ring gear. Craigslist Search, Craigslist is no longer supported. part # description qty 40045940 coverpan 1 40018901 rubber over metal coverpan gasket 1 40002169 coverpan bolt w/ adhesive 10 40060238 special coverpan bolt 2 40007601 magnetic fill/drain plug 1. 73 NEW - $505. Automotive Front Differential Carrier Rebuild - Re-manufacture. T-10 and T-89 bolt patterns look very similar also to ’49-’64 Ford pattern. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). it is in a 1977 chevy k/20. MAX Lock Locker Toyota 8. 5" 14 bolt semi float 6 lug will have the right mounts but you will need new u bolts and figure out how to get the driveshaft to work. However, the 10. teeth spread out on a 10. To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H. 1977 thru 1982 Chevrolet and GMC C/K (2 wheel and 4 wheel drive) Pickup Trucks. Note: These gears come in 2 different thicknesses for the same ratio. You can do one of two things: take your VIN number and call the dealership, they will give you more information you can think of. 5" Diameter Ring Gear • 1. 2: look in your glove compartment and look for one of these RPO codes: GQ1 -- AXLE REAR, STD RATIO GT4 -- AXLE REAR, 3. CHEVROLET 12-BOLT PASSENGER CAR Auburn Posi's Recommended for normal to mild abuse appli-cations only. The GM 14-bolt came in both a 9½-inch ring gear and a 10½-inch ring gear, and they're totally different animals. A removable stamped steel cover provides access for inspection and maintenance of the differential assembly. Visit Mike Anderson Chevrolet in Chicago IL serving Glenview, Park Ridge and Elmhurst #1GCGTBEN5L1104522. but the fuel Consumshion is Very Bad too. Motive Gear stock performance ring and pinions are excellent replacements for OE. US Gear manufactures ring and pinion gears for the high performance and motorsports markets. WE REBUILD TO YOUR SPEC'S. ***Call Zumbrota Bearing and Gear at 1-800-658-2537 ext 125 for customer service, availability and technical assistance***. The gear measures 8. 5" Rear - 30 Spline - 10 bolt cover with 8. As with all GM Salisbury rear axle assemblies, the number of bolts, in this case 10, refers to both the ring gear bolt count and the number of bolts retaining the rear cover.