GM 8 1/2"
 
Ring Gear Diameter:
Pinion Shaft Diameter:
Ring Gear Bolts:
Left Hand Threads:
Pinion Splines:
Cover Bolts:
 
8 1/2"
1.625"
10
7/16" x 20
30
10
Model
Year
K10, K15 • 77-87
K10, K15 82-Pres.
K20, K25 • 77-87
C10, C15 78-Pres.
G10, G15 79-Pres.
G20, G25 79-Pres.
Buick Full Size 77-96
Blazer 77-91
Apollo 73-77
Regal 73-77
Century 73-77
Biscayne 71-74
Grand National 84-87
Skylark, GS 71-75
Skylark, GS 77-79
Chevy Full Size Car 71-96
Chevy II 71-79
Nova 71-79
Camaro 71-81
Firebird TA 71-81
Cutlass 71-77
El Camino 71-77
Monte Carlo 71-77
Electra 76-78
Gran Sport 73-77
Impala 91-96
LeSabre 73-74
Olds Full Size 71-89
Pontiac Full Size 71-89
Hurst Olds 85-89
Omega 73-75
Omega 77-79
Grand Prix 71-77
Lemans 71-77
GTO 71-77
Roadmaster 71-74
Roadmaster 91-96
Ventura 71-77
Phoenix 71-77
 
Ratio
Teeth
Part #
2.73
49-18
GM10/273
3.08
40-13
GM10/308
3.42
41-12
GM10/342
3.73
41-11
GM10/373
3.90
39-10
GM10/390
4.10
41-10
GM10/410
4.56
41-9
GM10/456
4.88
39-8
GM10/488
5.13
41-8
GM10/513 *
   
Installation Kits
Part #
Master Installation Kts
Front (Truck)
GM10/MOKITF
Rear 99 & Up
GM10/MOKITRL
Rear
GM10/MOKITR
Installation Kits
Front (Truck)
GM10/KITF
Rear
GM10/KITF
Mini Installation Kits
Front (Truck)
GM10/MKITF
Rear GM10/MKITR
Pinion Bearing Set-Up Kit
PINSU1
* Requires a modified cross shaft for installation. Use Part Number GM10/XSM.
.......................................................................
 Front w/o IFS 
 Rear
 K Series 
 
Tech Note:
When replacing 2.56 and numerically lower ratio gear sets with a 2.73 or higher gear, the case must be changed to a 2.73 and higher case.
 
       
AMC Ring & Pinion Sets
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Suzuki Ring and Pinion Gear Sets
Toyota Ring and Pinion Gear Set
Ultralite Ring and Pinion Gear Sets
Precision Gear Differentials
Precison Gear Installation Kits
Precision Gear Bearing Set-Up Kits
Precision Gear Ultralite Series
The Precision Gear Story
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