Applications Model Year Model Year Chevrolet 70-76 Trans-AM 72-81 Chevelle 70-76 C10, K10 & K20 Front 77-87 Chevy II 70-75 Blazer Front 77-91 Camaro 70-81 C10, K10 & Blazer 80-94 GTO/Firebird 70-81 K1500 Front IFS 88 & Up Olds F-85 70-76 K2500 Front IFS 88 & Up Z-28 72-81     What differential ratio do you have? Need information on how to setup ring and pinion backlash Purchase your parts @ drivetrain.com and receive telephone access to experienced differential technician to assist you with installation, we help you solve the problem.

10-5/8" 10 HOLES Irregular Gasket Pattern SPECIFICATIONS RG Diameter 8.50" 10 3/8" X 18 LH Threaded Bolts PINION Diameter 1.626", 30 Spline CASE: 2.56 & Down, 2.73 Numerically Higher 8620 Material Heat-Treated Assembly Specifications: Cover Bolt Ft. Lbs. 20 Pinion Brg. Preload In. Lbs 24-25 Pinion Brg. Preload In. Lbs 10-15 Used Ring Gear Backlash .005-.009 Ring Gear Bolt to case Ft. Lbs. 90 Side Brg. Caps Ft. Lbs. 60

Differential Ring Gear and Pinion Sets			Quaility Gears provide guaranteed performance
Part Number	OE Number	Ratio	Teeth	Price
GM10-308	1258709	3.08	40-13	$207.33
GM10-342	1258710	3.42	42-13	$207.33
GM10-373	1259441	3.73	41-11	$207.33
GM10-373IFS		3.73	41-11	$241.66
GM10-411	26009753	4.11	37-9	$208.33
GM10-411IFS		4.11	37-9	$291.66
GM10-456		4.56	41-9	$208.33
GM10-456IFS		4.56	41-9	$294.66
G885488		4.88	39-8	$241.66
G885513		5.13	41-8	$241.66
G885342IFS		3.42	41-12	$241.66
G885373IFS		3.73	41-11	$241.66
G885411IFS		4.11	37-9	$241.66
G885456IFS		4.56	41-9	$241.66
Is your GM 10 Bolt to weak for your application see our 14 Bolt drop-in replacement differential assembly, it is the answer to your problem. You can useyour existing wheels and tires.

Differential Parts

Description	Part Number	Price
Case, Empty 8.5" 2.73 -UP OEM	SA65-2021	$116.67
Case, Loaded 8.5" 28 spline 2.73 up	MW-GM10L-28	$225.75
Case, Loaded 8.5" 30 spline 2.73 up	MW-GM10L-30	$235.75
Bearing/Overhaul Kit 8.5" Rear 1998 Older no-posi	DTSR10RMK	$86.76	This new Redline synthetic gear oil is recommended for replacement when replacing ring gear pinion sets and or bearings, your cost only $9.95 qt. See other Red Line Oil Products that we recommend.
Bearing/Overhaul Kit 8.5" Rear 1998 Older with-posi	DTSR10REMK	$97.77
Bearing/Overhaul Kit 8.5" Front	SA35-2021F	$97.33
Internal Kit 8.5" 28 spline Open (spider/side gears, cross shaft thrust washer)	SA85-2021B	$123.99
Internal Kit 8.5" 30 spline Open (spider/side gears, cross shaft thrust washer)	SA85-2021A	$123.99
Installation Kit use when installing a new ring and you don't what new bearings . Kit includes new ring gear bolts, pinion seal, nut, crush sleeve, shims. Carrier shims marking compound and gasket.	DSGM8.5IK	$34.64
Axle 28 Spline, 82-88Jimmy/Blazer, 81-88 Chevy P/U s0 series, 81-87 GMC 1500 Series, 81.88 Suburban 10 & 1500 series. 5 holes, R&L. 31 5 /16" length.	PA5384	$140.99	Installation Tool, Your Cost $48.98 + S&H.
Axle 30 Spline, with IFS 4WD 88-98 Chevy Truck 1500 series, 88-98 GMV 1500, 92-98 Suburban 1500, 92-98 Tahoe/Yukon, 6 hole L&R. 33" length.	PA5532	$120.99
Axle 30 Spline Van 88-95 10 & 20 Series, 88-95 GMC Van 1500 & 2500 Series, 5 hole R&L 33 5/16" length.	PA5561	$140.90
Axle 28 Spline Van 75-88 Chevy Van 10 Series, 79-88 Chevy Van 20 Series, 75-88 GMC Van 10 Series, 79-88 GMC Van 20 Series, 33 5/16" length.	PA5563	$124.17
Axle 30 Spline 2WD 88-98 Chevy & GMC Truck 1500, 92-98 Subukrban 1500, 92-98 Tahoe & Yukon, 5 hole R&L 31 13/16" length.	PA5650	$124.17
Axle 28 Spline 2WD 79-89 Blazer, Jimmy, 79-87 Chev & GMC Truck C10/C1500, 79-89 Suburban C10/C1500, 5 hole R&L 31 3/8" length.	PA5694	$114.17
Axle 30 Spline 2WD 88-91 Blazer & Suburban 10/1500, 5 hole R&L 31 3/8" length.	PA5695	$126.86
Axle 28 Spline 73-77 Chevelle & El Camino 5 hole R&L 30 7/16" length.	PA5774	$136.97
Axle 28 Spline 73-77 Chevelle & El Camino 10 hole R&L, 30 7/16" length.	EV10-3	$ 302.00	EV Kit includes bearings, seals and studs. 10 holes allow for dual bolt patterns to allow for upgrading to larger studs.
Seal, Axle Car 2.25 Outside Diameter	NAT8660S	$5.57
Seal, Axle Truck 2.535 Outside Diameter	NAT8835S	$5.57
Seal, 4x4 Front Axle Shaft Inner	NAT5131	$16.98
Pinion Seal Rear	NAT1537	$15.37
Pinion Seal 4x4 Front	NAT8622	$17.50
Bearing, Axle			Available to many to list please call for quotation.
Differential Cover GM 1970 up 1500 Truck, Suburban 1500 & 2500, Blazer, Vans & some Cars, Increase the fluid capacity, you will find that the fluid will run 15 to 20 degrees cooler. 1.5 quarts to 4 quarts, 3 1/4" overall height	DTSGM10Bolt8.5	$265.00

Differential Positraction Units

Description	Part Number	Price	Whats the difference in Positractions? Differentials whats the Difference
ARB Airlocker 28 Spline	RD83	$1115.80
ARB Airlocker 30 Spline	RD84	$1115.80
Auburn Limited Slip Positraction 28 Spline	542018	$410.10
Auburn Limited Slip Positraction 30 Spline	542022	$410.10
Detroit Locker 28 Spline	187C149A	$597.97
Detroit Locker 30 Spline	187C149A	$597.97
Detroit Tru-Trac 28 Spline Front	913A332	$571.25
Detroit Tru-Trac 28 Spline Rear	913A322	$571.25
Detroit Tru-Trac 30 Spline Rear	913A309	$571.25
Eaton Large Hub GM Car, 1971-1988, GM Truck 1980-1988, 28 spline, 2.76 & up	19557-010	$492.86	Recommended replacement for non-repairable non-working GM stock Gov-loc positraciton
Eaton Large Hub GM Car, GM Truck 1988, & later 30 spline, 2.76 & up	19559-010	$485.29
LockRight 1/2 Ton Pickup, Jimmy, Blazer, Suburban 77-88 Front 28 Spline	1920	$290.59
LockRight 1/2 Ton Pickup, Jimmy, Blazer, Suburban Thru 88 Rear 28 Spline	1920	$290.59
1/2 Ton Pickup, Jimmy, Blazer, Suburban 30 Spline 89-98	1921	$290.59
no-Slip Powertrax 28 spline	92-0785-2805	$445.96
no-Slip Powertrax 30 spline	92-0785-3005	$445.96

In addition to the General Motors 10 bolt 8.5 inch differential parts and accessories listed here, we also provide an impressive list of automotive after market products for car, pickup truck, SUV and 4wd repair parts and accessories that includes rear end covers, ring and pinion gears, OE clutches and heavy duty performance clutches, diesel gauge kits, exhaust brakes, re manufactured manual transmissions and both manual and automatic overhaul kits. Other products we offer for the RV recreational vehicle market include REMCO drivelinedisconnects, tow bar and baseplates and auxiliary overdrive units to improve vehicle performance and save fuel. We have a complete 4 wheeling drivetrain product line including complete differential assemblies, limited slip and other solid locking positractions. We offer transmission conversion kits including the NV4500 and NV5600 as well as replacement kits for light duty GM and Jeep transmissions. You may be interested in visiting our Ford and Powerstroke Diesel page, Dodge Ram and other Jeep pages for detailed information.

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