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8.5 Inch Rear End 10 Bolt Chevrolet & GM Ring Pinions and Parts, We ship worldwide!

Motor vehicle Parts Warehouse facility and Installing Mechanic Shop providing Metropolitan Minneapolis MN area. For an entire list of merchandise you can expect see www.provenforce.com.

Running the incorrect ring and pinion differential ratio can cost you a lot of money! Picking the incorrect gear manufacture or incorrect ratio can cause excess noise and or cost. Change Your Ratio Improve Fuel Economy and or Improve Off the Line Power & Towing Performance!

  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
  • Actual Parts may vary, click to see details Actual Parts may vary, click to see details
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We offer a wide range of 8.5 inch differential rear end repair parts and upgraded assemblies plus installation services for Chevrolet General Motors (GM) Cars, pickup trucks, SUV and Vans. Rear end parts are available for the popular 8.5" rear ends. See vehicle Application guide Cars and Pickup Trucks. Check specification listing to insure that you have identified the correct rear end.

The GM 8.5" differentials are used in the following models: Chevrolet and GMC Cars, Full Size Pickup trucks, without ABS plus Deville, Electra, Olds 98, Park Avenue, 4WD Full Size & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD Mid-Size Pickups & Blazers, 4WD Mid-Size Pickups & Blazers, Full Size Van Express, Savana. Differential ring and pinions and parts are also available for vehicles with ABS including: Caprice, Impala, Oldsmobile, Custom Crusier Fleetwood.

See detailed product line listings many parts we supply are original equipment OE, you can find: ring and pinion without ABS, ring and pinion sets with ABS, bearing overhaul kits, differential case carriers, internal kits (spider side gears thrust washers and cross shaft), positractions, pinion parts and axles. We also have pinion parts, and small parts for the Chevrolet GM 8.5" Rear Ends. If you need better traction (for mud, snow or off road performance) Positractions unit are also available.

American Axle Manufacturing (AAM) gears are face hobbed and set up with a biased pattern, not an oval contact pattern like old style face milled gears. Providing matched ring and pinion sets with long life, guaranteed performance, quiet running ring and pinion gears:

  • CNC start to finishOE parts rear end
  • Central contact pattern
  • Solid shank pinion shaft
  • Computer controlled heat treating
  • 8620 Steel
  • Strict quality control
  • Easier Setup Superior Strength
  • Warrantied for 12 months 12,000 miles from date of purchase. What one American Axle Manufacturing ring and pinion set customer had to say!

To assist you in identification of the correct parts you need we have provided a detailed parts breakdown illustration. Why you might want to change your ring and pinion ratio.

Chevrolet GM 8.5" Rear End Vehicle Application Guide

Apollo, Regal, Century 73-77   Grand Sport 73-84
Biscayne, Roadmaster 71-74   Hurst OLDs 85-88
Buick Full Size 71-96   Impala Roadmaster 91-96
Camaro 70-81   LaSabre 73-74
Chevelle 70-76   OLD SV 71-92
Chevrolet Full Size 71-96   Olds F-85 70-76
Chevy II Nova 70-79   Omega 73-79
Cutlass, Grand Prix, Lemans, GTO, Ventura, Phoenix 71-77   Monte Carlo 71-83
El Camino 71-77   Pontiac Full Size 71-89
Electra 73-78   Skylark GS 71-79
GTO, Firebird, Trans AM 70-81   Z-28 72-81
Grand National 84-87      

 

Blazer FS Front & Rear 77-91   GM 3/4 Ton Front 77-99
C10, C15, G10, G15 78-On   GM 3/4 Ton Rear 79-95
G20, G25 79-On   GM 3/4 Ton W/Posi (R) 77-99
GM 1/2 Ton Front 77-91   K10, K15, K20, K26 Front 77-87
GM 1/2 Ton Rear 71-On   K10, K15 Rear 82-On
GM 1/2 Ton W/Posi (R) 70-99      

 

Chevrolet GM 8.5" Rear End Specification Guide

gmc 8.5" rear end ring and pinions & parts

POWER UP!

GEARS DESIGNED TO MEET YOUR APPLICATION REQUIREMENTS, LOWER GEAR RATIO FOR OFF THE LINE & TOWING PERFORMANCE, HIGHER GEAR RATIO FOR IMPROVED GAS MILEAGE!

 

Specifications

  • Cover 10 Holes
  • RG Diameter 8.5"
  • 10 7/16" X 20 RH Threaded Bolts
  • Pinion Diameter 1.626" 30 Splines
  • Case Breaks 2.56 and lower, 2.73 and higher

See what one American Axle Manufacturing customer had to say!

Chevrolet GM 8.5" Ring & Pinion List

Ring and Pinion Sets without ABS

Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 (Pickup & Utilities)

Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Ratio/Manufacture
2.73
3.08
3.23
3.42
3.73
4.10
4.56
American Axle OE
Call
$291.20
$266.67
$223.35
$223.35
$251.27
$327.60
Motive Gear Performance  
$211.69
$211.69
N/A
$211.69
$211.69
$211.69
$211.69
4.30, 4.56 and 4.88 ratio's also available from Motive
Yukon Gear
$292.55
$339.02
$255.45
$255.45
$255.45
$255.45
$255.45
Ring and Pinion Sets with ABS note see the difference
Caprice, Impala, Oldsmobile, Custom Crusier Fleetwood
Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Your Cost
Ratio/Manufacture
2.73
3.08
3.23
3.42
3.73
4.1
4.56
American Axle OE
$153.33
Call
$300.00
$300.00
$300.00
$266.67
Motive and Yukon gears are high quality after market, Motive Performance gears are quite and stronger than blue box. We recommend and supply ring and pinion set manufactured by America Axle Manufacturing subject to stock and availability..

Chevrolet GM 8.5" Ring Pinion and Parts List

Year Application
O.E. Number
Description Part Number
Your Cost
Ring and Pinion Gear Sets
1982+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 (Pickup & Utlities)
2584238
Ring and Pinion Gear Set (3.08 Ratio) PFAA40049437
$291.20
1986-96 Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 (Pickup & Utlities)
25824239
Ring and Pinion Gear Set (3.23 Ratio) PFAA40049439
$266.67
1986+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 + F9 (Pickup & Utlities)
2584237
Ring and Pinion Gear Set (3.42 Ratio) PFAA40048438
$223..35
1982+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 (Pickup & Utlities)
25824240
Ring and Pinion Gear Set (3.73 Ratio) PFAA40049429
$223..35
2002+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana, GMT 355/360 (Pickup & Utlities)
25824241
Ring and Pinion Gear Set (4.10 Ratio) PFAA40049433
$251.27
1982- 99
Ring and Pinion Gear Set (4.30 Ratio) PFMWG885430
$228.98
1982- 99
Ring and Pinion Gear Set (4.56 Ratio) PFMWG885456
$211.69
1982- 99
Ring and Pinion Gear Set (4.88 Ratio) PFMWG885488
$211.69
Above three gear sets are after
market Motive Performance
1986-96 Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
Ring and Pinion Gear Set (3.08 Ratio ABS) PFAA40053033
$153.33
1986-96 Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
Ring and Pinion Gear Set (3.23 Ratio ABS) PFAA40053035
Call
1986-96 Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
Ring and Pinion Gear Set (3.42 Ratio ABS) PFAA40053029
$300.00
1986-96 Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
Ring and Pinion Gear Set (3.73 Ratio ABS) PFAA40053037
$300.00
1982-96 Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
Ring and Pinion Gear Set (4.10 Ratio ABS) PFAA40053031
$300.00
 
Bearing Kits
1973- 87 Car
8.5" Rear 10 Bolt Bearing Kit PFMWR10RMKT
$95.95
1970- 99 Truck
8.5" Rear 10 Bolt Bearing Kit PFMWR10RMK
$85.95
1999+
8.5" Rear 10 Bolt Bearing Kit PFR-10
$110.94
8.5" Front 10 Bolt Bearing Kit PFR-10-FR
$124.19
     
Differential Parts
1982-99
26010481
Diff. Open Case Without Internals 28 Tooth PFAA26010481
$137.95
Side Bearing Race PFLM501314
$9.00
Side Bearing 2.891 OD 1.625 ID PFLM603049
$19.37
Side Bearing Race for Eaton Posi PFLM102949
$16.77
Side Bearing 2.891 OD 1.625 ID PFLM102911
$19.29
Open Side Washer PFAA1235873
$1.33
Differential Shims GM10/ADJ
$34.00
10 Bolt Cover PFAA26067595
$32.08
Positraction
Eaton Positraction
28 Spline PFEA19557-010
$484.83
Eaton Positraction
30 Spline PFEA19559-010
$484.83
Eaton Positraction
Clutch Pack Carbon PFEA29426-00S
$128.11
Eaton Positraction
Clutch Pack Steel PFEA29403-00S
$93.85
Yukon Spartan
28 Spline, more information recommended for off-road applications. PFSLGM8.5-28
$355.29
Yukon Spartan   30 Spline, more information recommended for off-road applications. PFSLGM8.5-30
$355.29
Yukon, Dura Grip   30 Spline, more information PFYDGGM8.5-3-30-1
$462.06
Yukon, Dura Grip   28 Spline, more information PFYDGGM8.5-3-28-1
$462.06
Yukon, Grizzly Locker 8.5 & 8.6 inch 30 Spline 2.73 Up more information PFYGLGM8.5-3-30
$662.87
   
Internal Kit
1988- before
Internal Kit, Spider/Side Gears, Thrust Washer and cross shaft 28 teeth. PFGM10BI
$124.20
1988+
Internal Kit, Spider/Side Gears, Thrust Washer and cross shaft 30 teeth, PFGM8.6BI30
$131.27
Cross Shaft PFAA14006401
$15.65
Lock Bolt PFAA14056196
$1.62
Pinion Parts
1997 & before
Pinion Seal PFAA26062043
$16.00
1997+
Pinion Seal New Style PFAA26064028
$16.00
1982+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood.
9783762
Pinion Nut PFAA1260823
$2.87
1982+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood.
571900
Pinion Nut Washer PFAA74007900
$1.98
Bolt for Pinion Yoke 1350 Series PFAA14018700
$2.82
Pinion Yoke Old Style Steel Slinger PF1256654
$88.01
Pinion Shims PFPS100
$12.94
Crush Sleeve PFAA1234726
$2.51
Axle Parts
1982+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, "C" Pickup (prior to 1987), "C" Pickup 4WD (prior to 1987), 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana Caprice, Impala, Oldsmobile, Custon Crusier Fleetwood
3833322
Axle C Lock PFAA74003322
$1.33
1986-88 Full Size Van Express, Savana
Axle Shaft - L/R (846 mm; 30 Tooth; 5 Bolt) PFAA26042818
$83.33
1975-89 Full Size Van Express, Savana
Axle Shaft - L/R (838 mm; 28 Tooth) PFAA14042690
$83.33
1988+ Deville, Electra, Olds 98, Park Avenue, 4WD FS Truck & Utility Truck
Axle Shaft - L/R (838 mm; 28 Tooth; 6 Bolt) PFAA15521892
$125.00
1988-91 Deville, Electra, Olds 98, Park Avenue,
26010415M
Axle Shaft (797 mm; 30 Tooth; 5 Bolt; Drum) PFAA74020415
Call
1988-95 Full Size Van Express, Savana
26013313
Axle Shaft (846mm; 30 Tooth; 5 Bolt; Drum) PFAA74023313
Call
1988-91 4WD Full Size Truck and Utility
26010414M
Axle Shaft (801 mm; 30 Tooth; 6 Bolt; Drum) PFAA74020414
Call
1989+ Deville, Electra, Olds 98, Park Avenue, 4WD FS Truck & Utility Truck
26010416M
Axle Shaft (839 mm; 30 Tooth; 6 Bolt) PFAA74020146
Call
1992-98 Deville, Electra, Olds 98, Park Avenue, 4WD FS Truck & Utility Truck
26010417M
Axle Shaft (808 mm; 30 Tooth; 5 Bolt; Drum) PFAA74020417
Call
Small Parts
Ring Gear Bolt PFAA14066913
$2.03 ea
1998+
Coverpan Gasket PF3993593
$1.87
1988+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana
12471686
Output Seal PFAA40001710
$5.37
1988+ Deville, Electra, Olds 98, Park Avenue, 4WD FS & Utility Truck, 2WD MS Pickups & Blazers, 4WD MS Pickups & Blazers, FS Van Express, Savana
12479031
Roller Bearing ASM PFAA40008157
$12.88
Impala, Caprice
ABS Reluctor 18 tooth for 3.73 ratio PFAA26018946
Call
Impala, Caprice
ABS Reluctor 21 tooth for 3.23 ratio PFAA26018944
Call
Minimum charge $25.00. S&H Charges will be added.    

Chevrolet GM 8.5" Free Parts Illustration

8.5" GM Rear End Parts Illustration

Whats the difference between gears with and without ABS?

ABS rings gears have a back cut/clearance that the "without" gears don't have as the ABS reluctor wheel requires additional space, where the reluctor goes right behind the ring gear.

Customer recommends American Axle ring and pinions and setup advice: "You will not regret this choice...gears are not a good place to cheap out and the GM gears really are made and finished a lot better. Note that these run extremely tight backlash .004"-.007", shoot for .004"." See image below for what the pattern looked like during trial settings and the final pattern.

setup pattern

 

Free Test Drives, Free Estimation, Free Technical Support at Proven Force

The Proven Force Service Center provides skilled and trained mechanics services to assist you in keeping your vehicle in top running order. We have 3 service/installation bays and offer guaranteed workmanship and parts. We can change your Chevrolet and GMC 8.5" ring and pinion for you. Walk-ins are welcomed and in most cases we offer same day service. Trying to determine what Chevrolet General Motors 8" ring and pinion ratio or differential parts that you need, or having problems diagnosing your vehicles performance we offer Free Technical support and test drives to assist you.