gm 10 bolt gear ratio identification

July 3, 2022

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gm 10 bolt gear ratio identification

There have been non C-clip rearends found in Chevelle wagons, and some El Caminos through at least 1974. CASE, Diff. at CA, KY, MN, WA. The1971-'72 Buick GS/Skylark and Olds Cutlass A-body 8.5 10 bolt did not have C-clip axles. This gives me a more accurate count. The GM 7.625" version of the axle uses a slightly larger 7.625" diameter ring gear with 28 spline axle shafts, however, because both models use the same axle housing, the . For simplicity, I generally calculate at 60 mph - here's how the tire size/gearing/rpm formula pencils out for my current set up, and for the ratio changes I'm considering.. Current setup - 3.73 diff ratio: 813 (tire revs per mile) x 3.73 (diff ratio) = 3032 (driveshaft rpm) x .67 (4th gear OD ratio) = 2031 rpm @ 60 mph. 10.50 5.13 RATIO THICK GEAR 4.10 &DN CARRIER: MOTIVE GEAR: MG3663696GM . GM 8.5 Inch 10 Bolt 4.10 Ratio Dry 2-Cut Ring and Pinion Revolution Gear. 1 - 12 of 12 Posts. I agree, pull the 10 bolts, then look on the ring gear, 2 numbers will be stamped on it, example 12 - 44 Divide them, that will give you your ratio. Hanging 12. For my car 10 tire revolutions equals 33.6 driveshaft revolutions, so I have a 3.36 gear ratio. The following is a complete list of GM RPO axle codes for Chevy and GMC vehicles starting with the letter F. RPO. Likewise, ring gear thickness must increase to properly mate to the smaller diameter pinion. Give us a call at 800-216-1632 to get started. Basic identification is simple. Installation. 8.5 inch 10-bolt. D = Day shift N = Night shift 1 = Day shift 2 = Night shift - = No positraction D = Dana . However, determining the different gear ratios of the . The ratio code is usually two letters (sometimes 3, sometimes a number & 2 letters), and is found on the right-hand axle tube. The 8.2 rear end has 3/8" ring gear bolts with 9/16" head where the 8.5 . Raise and support the rear of the vehicle with jack stands. Read the metal tag attached to one of the differential cover bolts. The pinion nut will be 1 1/4". There were two 8.5-inch carriers used: one for 3.23:1 and lower ratios, and one for 3.43:1 and higher ratios. To improve the strength of the 10-bolt would be to upgrade the axles, and the ring gear. 41 teeth on ring gear: 41 teeth on ring gear: 40 teeth on ring gear: 10 teeth on pinion: 12 teeth on pinion: 13 teeth on pinion: 41/10 = 4.10: 41 . The GM 10 Bolt 7.5 rear end, also known as the AAM 7.5, GM 7.6, and GM 7.625 rear end was the most common housing used in GM G-body car vehicles. Before you start, you need to identify your parts. That being said, limited gear sets are offered for the carriers, especially if you plan to change gear ratios. Differential Identification. _____ M.P.H. GM RPO Codes - Factory Identification Labels and Interpretation. This item GM Chevy 8.2" Chevy 10-Bolt Rearend Posi, Gear, Bearing Kit Package - 3.73 Ratio Yukon Gear & Axle (YDGGM8.2-3-28-1) 28-Spline Dura Grip Positraction for GM 8.2 Differential with 3.08 & Upward Axle Ratio SKU: GM10-410DC. USA Standard Ring & Pinion gear set for GM 8.2" in a 3.55 ratio. The GM 10.5" 14 Bolt axle, also known as the GM 14 Bolt and Corporate 14 Bolt has been in use by Chevy and GMC since 1973 and features . View Details. A Series 2 carrier will work with 2.56 and higher gears (numerically lower) such as 2.41. CHEVROLET 12-BOLT PASSENGER CAR Ring and Pinion Sets We offer complete coverage of ratios for your 12-bolt rears. $226.20 $119.60 Add to cart View Yukon Master Overhaul kit for '64-'72 GM 8.2" differential . . F17. 10-Bolt Carriers. The gear ratio codes are located on the front passenger side of the differential as shown in the illustration below. Inside the 8.2-inch 10-bolt, the ring-gear bolts have 9/16-inch socket heads with 3/8-24 left-hand threads. This rear end was available in a 10 bolt version only. Compared to the 14-bolt full-float axle, the 14 bolt semi-float has a smaller ring gear (9.5), and the axle shaft can not be removed without also removing the wheels. Much more accurate than trying to figure out what .36 revolutions is. As the name implies, GM 10-bolt differentials will utilize 10 bolts to secure the differential cover to the carrier. Popular OEM and Aftermarket Gear Ratios. Proper identification will be necessary for the purpose of ordering parts. The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. Gear Calculatoris available on RICHMOND website www.richmondgear.com The following formula has been developed to calculate the optimum final Gear Ratio to suit your application. There have been non C-clip rearends found in Chevelle wagons, and some El Caminos through at least 1974. Product Description; Additional Information; Product Description. 1974 A and G Body Rear Axle ID : This chart applies to most GM 8.5 10-bolt axles . T. However, only certain gear sets are offered for the carriers, especially if you change gear ratios. Call Sierra Gear & Axle at (800)792-2714. The non C-clip 8.5" 10 bolt, type "C" rearend was used in some 1969-'72 Pontiac GP and 1970-'72 Monte Carlo. The non C-clip 8.5" 10 bolt, type "C" rearend was used in some 1969-'72 Pontiac GP and 1970-'72 Monte Carlo. Teeth: 39-10. The BOM will identify the model number, the gear ratio, the type of axle / differential, and component parts. Keep in mind that in some applications the gear ratios might not calculate exactly, as is the case with 4.09, 4.10, and 4.11 gears and 4.30 and 4.31 gears. 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). The 10-bolt was used in all the low performance applications. 2.53. Some people will trash talk the GM 10-bolt as a "junk" rearend, and if they are talking about the 8.2-inch, then they are not far off. On some tags, the first 2 digits won't . This assembly used an 8.2-inch ring gear diameter and 28-spline axles for Camaros, Chevelles, Impalas and even the early Chevy II's. Has a 10 bolt cover as well as 10 bolts securing the ring gear. I`ve seen guys take the cover off and see 41 - 11 stamped on the ring gear and they`ll say "hey,, some 4.11`s!" and i do believe 41 - 11 is 3.73`s. Ratio. Item #: GM8.5-373-YG Yukon Gear. Differentials that feature Positraction will have a small identification number comprising two or three digits, located on the lower right side of the . In 1970 the rear end was built in both 10 and 12 bolt versions. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled "Service Parts Identification" inside the drivers door panel or glove box. Just like a 10-bolt rearend, there should be stamped numbers on the axle tube - on the passenger's side. The BOM stamp (2) or Axle Identification Tags (2A) are used to identify Dana axles / differentials. Ring Gear Bolt Torque: 120 ft-lbs Carrier Bearing Caps: 135 ft-lbs Gear Oil: Mineral Oil: Valvoline 80W-90: Full Synthetic: Mobil 1 75W-90: Recommended: Mobil 1 75W-140: Oil Capacity: 3.25 qt. Also with a new master rebuild kit, which comes with Timken bearings, will ensure greater strength and durability. RustyNailJustin said: 14 bolt uses "thick" ring gear no new carrier. Remember, the actual rpm indicated in the chart will be slightly higher (between 100 and 300 rpm) on vehicles equipped with an automatic transmission. But the 8.5-inch 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. Chevy 10-bolt car (8.2"): 2-series is 2.56 and 2.73. 3-series is 3.08, 3.36 and 3.55 (other ratios available in aftermarket). Transaxle. Individual gear ratio identification codes can be found for their respective years on this website. Axle Type. Only show this user. $204.99. All Yukon Gear GM 10 bolt 8.5 inch ring and pinion gears are manufactured to the highest specifications. 3.23 and numerically higher ring & pinion ratios are designed for use with a "3 series" carrier. These ring and pinion sets are manufactured to meet exact specifications to ensure a quality product every time. I agree, pull the 10 bolts, then look on the ring gear, 2 numbers will be stamped on it, example 12 - 44 Divide them, that will give you your ratio. There are several differentials for the 10-bolt rearend. The 12-bolt was used in many vehicles . Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or "Regular Production . Ring Gear Dia. 40 5531 2402525 10 BOLT, Gear to Case (Also Part of Gear Kit 5.529) 41 5.510 . . The 10 bolt Chevelle rear end has the 8.2" ring gear from 1964 to early 1972. 1958-1970 Chevy Rear Differential code Identification : . Menu. Ring Gear Diameter: 8.500 Cover Bolts: 10 Ring Gear Bolts: 10 Spline Count: 30 Dropout: False Pinion Support: False Carrier Breaks: 2.56 / 2.73 Rear Suspension: Solid : Featured Products GM 4.10:1 ring gear . J.T. Jan 6, 2009. Estimated to ship direct from manufacturer on 06/13/22, pending manufacturer availability. All Revolution Ring and Pinion sets are backed by an industry leading 2 Year Warranty against defects. Yukon Gears are a high performance quiet gear, perfect for any GM 10 bolt 8.5" or 8.6" equip. 4.10,4.11,4.56 Ratios (Less internal gears) CASE, Diff. Typically, 10-bolt carriers are specific to a series of gears. i just talked with dunks performance out of springfield oregon. GM 8.5" -1968-70 Oldsmobile 12-Bolt Cover/10-Bolt Gear GM 8.6" - 2000 & Newer 1/2 Ton Truck Ring Gear Diameter: 8.5" Ring Gear Diameter: 8.6" . Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading." A 2-Series carrier holds 2.56:1 and higher gears (numerically lower) such as 2.41. he said that yukon has discoutinued the the thin 5.13 gear sets, and if you are looking for a 5.13 gear your current axle must have 4.10 and numerically lower gears in it for the new 'thick' 5.13 gear set to work . If unknown, please consult your local mechanic as these items are critical to selecting the appropriate differential unit. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled "Service Parts Identification" inside the drivers door panel or glove box. Sometimes referred to as the "corporate 10-bolt", the GM 8.5" 10-bolt rearend began production in 1971 to replace the 8.2" and 12-bolt rearends. 4. Has 10 bolt cover and 30 spline c/clip axles. F16. Typically, 10-bolt differentials are specific to a series of gears. Most 8.5" 10-bolts have a bulged-out 11" cover (for ring gear clearance) with big square lugs on the housing below the cover (red arrows). I mark the tire and the drive shaft and rotate the tires 10 revolutions. Transaxle. Like all Chevy 10-bolts, the axles are retained by C-clips on the inner end of the axle shaft inside the carrier. How To Install a Limited Slip/Posi Unit in a GM 10 Bolt 8.5 Rear-end; How To Install Ring and Pinion Gears in a Ford 8.8 Rear-End; How To Narrow a Ford 8.8 Inch Rearend; How To Rebuild a GM 10 Bolt Chevy 8.5 Rear End; How To Select Proper Rear-End / Differential Gear Ratio; Mopar Body Style Codes; Popular Automatic Transmission Dimensions 3.43 ratio: 10.5" 14 Bolt - Rear Axle; 11.5" 14 Bolt - Rear Axle; 11.5" Rear Axle; 12.0" Rear Axle; 195 MM Rear Axle; 218 MM Rear Axle; 250 MM Rear Axle . The code will tell you what was originally installed in the housing, but nothing about any changes that might have been made since then. Ratio: 3.90. 10 bolt : Detroit gear & axle : GR : 3.08 : Yes (this code only used for . We offer the most complete line of rear end parts for the GM 8.5" commonly referred to as the 10 Bolt differential, this differential was utilized GM used this very popular differential in there full size Chevrolets, Chevelle, Chevy II, Camaro and and GTO/Firebird Pontiac products starting in 1970. 1971 - 1989 GM 10 bolt C-Clip 8.5" 1.20" 28 2.73 & up 187C149A* A556*91219557-010* 1964 - 1971 GM 10 bolt Buick, 8.2" 1.25" 28 3.36 & up 19674-010 Olds and Pontiac . Aftermarket GM 10 bolt 8.2 gears are made to be stronger than OEM gears. GM Ring & Pinion Gear Set. If the vehicle was purchased secondhand, this tag may not be valid if . . Several differential carriers are offered for the 10-bolt axle assemblies. 8.875 Ring Gear Diameter 30 Spline Pinion 1-1/8" Pinion Nut Ring Gear Bolt: 9/16" Head, 3/8"-24 R.H. RC12-3.42 RC12-3.55 . The GM 7.5" 10 Bolt axle, also known as the AAM 7.5", GM 7.6", and GM 7.625" axle is the most common housing used in GM G-body car vehicles and features a 7.5" diameter ring . This is due to the slip present in an auto transmission's torque converter.

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