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Home arrow Ring and Pinion Sets arrow What gear ratio do I have in my GM or Chevrolet




  

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What gear ratio do I have in my GM or Chevrolet rear end, do I have positraction Print E-mail

What rear end gear ratio do I have in my Chevrolet or GMC?What rear end ratio do I have in my Chevy

How do I find my rear end ratio?

The table below will help you determine what rear end ratio you have by using your RPO code, answering the question: What rear end ratio was in my Chevrolet or GMC vehicle when it left the factory. You can typically find your RPO code on driver side door panel or glove box.

General Motors rear end differentials are referred to by the diameter of the ring gear, i.e. 7.5 inch, 8.5 inch, 10.5 inch.  Our experts will help you find the correct ring and pinion set for your particular application.  Give us a call at 800-216-1632 to get started. We have a large selection of gear sets in stock and can recommend the correct gear ratio to match your engine horsepower, transmission specs and tire size to give you the desired performance.

Switching your rear end gear ratio helps your gas mileage or improves your power!

 Now you know your ring and pinion ratio to see parts that are available follow this link

need_ring_pinion.jpg

If you're looking for better gas mileage, you want to switch to a higher gear ratio.  If your looking for more power or performance, you would switch to a lower ratio.  It's just backwards from the way we think, if you have a 4.10 ratio and need better fuel mileage you would switch to a 3.42 or 3.73 gear ratio.  If you have a 3.42 rear end ratio and need more towing power you would switch to a 4.10 ratio .  If you have installed larger tires, they rob performance, and you would want to go to a lower ratio like a 4.56 or 4.88 depending upon your tire diameter.


Want to search for rear end parts by application, ask the Gear Wizzard gear_guy.jpg

 

We specialize in matching your tire size and ring and pinion ratio for your specific application and needs. Thinking about changing tire sizes? We can help! Consult our Look up chart for determining engine RPM, gear ratio and tire size combination.  Larger tires on lifted truck suffer from loss of power, changing the ring gear and pinion to a lower ratio is the answer.

Why you need a positraction?

Without positraction only one rear wheel receives the power.  In bad road conditions like mud, ice or snow, power to one wheel is bound to get you stuck.  Installing a positraction distributes power to both wheels at the same time, causing a significant improvement in traction.  For positraction replacements and parts see the following link.  Positraction units are available for many General Motor FWD Front Wheel Drive models.

A chart is also provided which presents Differential cover/gasket shapes, which is a common technique to identifing differential ring gear diameter.  And a Dana/Spicer Parts illustration showing how to locate the Dana bill of material number is provided below. This is a critical number to ensure that you find correct Dana parts the first time.  For example, in some cases, Dana used 3 to 4 different ring gear widths for a Dana 35 ring gear. So the set up is not the same for each gear category. 

RPO CODE DESCRIPTION
RATIO
F16 TransAxle Final Drive
2.53
F17 TransAxle Final Drive
2.84
F18 TransAxle Final Drive
2.65
F25 TransAxle Final Drive
3.32
F29 TransAxle Final Drive
2.82
F36 Axle Front
2.19
F45 Axle Front
2.93
F47 Axle Front
2.73
F57 Axle Front
3.15
F62 TransAxle Final Drive
2.39
F67 TransAxle Final Drive
3.19
F68 TransAxle Final Drive
3.45
F75 TransAxle Final Drive
3.18
F77 TransAxle Final Drive
3.73
F79 TransAxle Final Drive
2.97
F82 TransAxle Final Drive
3.23
F83 TransAxle Final Drive
3.05
F90 Axle Front
2.73
FA0 Rear
5.77
FA1 Rear 2 SPEED
4.88/6.94
FA2 Rear 2 SPEED
4.88/6.94
FH5 TransAxle Final Drive
2.81
FH6 Axle Front
3.64
FH7 TransAxle Final Drive
4.12
FH8 Axle Front
2.40
FH9 TransAxle Final Drive
2.60
FJ1 Axle Front
4.18
FJ2 Axle Front
3.74
FJ3 TransAxle Final Drive
3.35
FJ4 Axle Front
4.53
FJ5 Axle Front
4.19
FJ7 Axle Front
4.56
FP0 TransAxle Final Drive
2.55
FP1 TransAxle Final Drive
2.72
FP2 TransAxle Final Drive
3.58
FP3 TransAxle Final Drive
2.73
FP4 TransAxle Final Drive
2.69
FP5 TransAxle Final Drive
2.95
FP6 TransAxle Final Drive
3.54
FP7 TransAxle Final Drive
3.73
FP8 TransAxle Final Drive
3.54
FP9 TransAxle Final Drive
3.54
FQ2 TransAxle Final Drive
3.48
FQ3 TransAxle Final Drive
2.86
FQ4 TransAxle Final Drive
3.57
FQ6 TransAxle Final Drive
4.12
FQ8 TransAxle Final Drive
2.96
FQ9 TransAxle Final Drive
3.21
FR2 TransAxle Final Drive
2.93
FR3 TransAxle Final Drive
3.69
FR6 TransAxle Final Drive
3.84
FR7 TransAxle Final Drive
3.95
FR8 Axle Front
4.17
FR9 TransAxle Final Drive
3.29
FV0 TransAxle Final Drive
3.67
FV1 TransAxle Final Drive
3.72
FV2 TransAxle Final Drive
4.18
FV3 TransAxle Final Drive
3.11
FV4 TransAxle Final Drive
3.71
FV5 TransAxle Final Drive
4.19
FV6 TransAxle Final Drive
4.24
FV7 TransAxle Final Drive
4.29
FV8 TransAxle Final Drive
4.31
FV9 TransAxle Final Drive
4.53
FVO TransAxle Final Drive
3.67
FW2 TransAxle Final Drive
3.06
FW3 TransAxle Final Drive
4.02
FW4 TransAxle Final Drive
3.89
FW5 TransAxle Final Drive
4.10
FW6 TransAxle Final Drive
3.42
FW7 TransAxle Final Drive
3.83
FW8 TransAxle Final Drive
4.28
FW9 TransAxle Final Drive
3.43
FWS TransAxle Final Drive
4.10
FX1 TransAxle Final Drive
3.94
FX2 TransAxle Final Drive
2.66
FX4 TransAxle Final Drive
3.35
FX8 TransAxle Final Drive
3.61
FY1 TransAxle Final Drive
2.36
FY3 TransAxle Final Drive
3.79
FY5 TransAxle Final Drive
3 52
G11 TransAxle Final Drive
2.56
G44 Axle Rear
3.07
G72 Axle Rear
2.14
G75 Axle Rear
3.62
G76 Positraction Rear

G80 Axle Positraction, Limited Slip

G81 Positraction Rear Axle

G82 Axle Rear
4.56
G84 Axle Rear
4.10
G86 Axle , Rear, Limited Slip

G87 Ring Gear, 8.50 Inch

G89 Ring Gear, 7.50 Inch

G90 Rear
3.15
G91 Special Highway Rear Axle
3.08
G94 Axle Rear
3.31
G96 Axle Rear
3.55
G97 Axle Rear
2.73
GH0 Axle Rear
3.54
GH2 Axle Rear
2.29
GH3 Axle Rear
2.77
GH4 Axle Rear
2.92
GH7 Axle Rear
2.73
GJ1 Axle Rear
5.38
GJ2 Axle Rear
5.13
GK7 Axle Rear
4.78
GK8 Axle Rear
4.33
GK9 Axle Rear
4.63
GL0 Axle Rear
5.13
GL3 Axle Rear
6.17
GM1 Axle Rear
2.59
GM2 Axle Rear
3.44
GM3 Axle Rear
3.45
GM4 Axle Rear
3.67
GM5 Axle Rear
3.89
GM6 Axle Rear
4.22
GM7 Axle Rear
3.68
GM8 Axle Rear
2.56
GN9 Axle Rear
4.11
GS1 Axle Rear
2.73
GS3 Axle Rear
3.73
GS4 Axle Rear
3.70
GS5 Axle Rear
4.11
GS6 Axle Rear
4.56
GS8 Axle Rear
3.94
GT1 Axle Rear
2.56
GT2 Axle Rear
2.29
GT4 Axle Rear (DUP of RPO Code 5X1)
3.73
GT5 Axle Rear (DUP of RPO GT8)
4.10
GT7 Axle Rear
3.33
GT8 Axle Rear (DUP of RPO GT5)
4.10
GU1 Axle Rear
2.41
GU2 Axle Rear
2.73
GU3 Axle Rear 2.93
GU4 Axle Rear
3.08
GU5 Axle Rear
3.23
GU6 Axle Rear
3.42
GU7 Axle Rear
2.77
GU8 Axle Rear
3.90
GU9 Axle Rear
3.91
GV0 Axle Rear
3.55
GV1 Axle Rear
2.73
GV2 Axle Rear
5.83
GV3 Axle Rear
3.08
GV4 Axle Rear
3.36
GV5 Axle Rear
3.55
GV7 Axle Rear
4.11
GV8 Axle Rear
2.72
GV9 Axle Rear
4.25
GW2 Axle Rear
2.56
GW3 Axle Rear
2.56
GW4 Axle Rear
3.31
GW5 Axle Rear
2.73
GW6 Axle Rear
3.27
GW8 Axle Rear
4.10
GW9 Axle Rear (DUP of RPO GU3)
2.93
GX1 Axle Rear
3.70
GX2 Axle Rear
3.07
GX3 TransAxle Final Drive
3.33
GX4 Axle Rear
3.75
GX5 Axle Rear
4.09
GX6 Axle Rear
3.53
GX8 TransAxle Final Drive
3.74
GY2 Axle Rear
3.31
GY3 TransAxle Final Drive

4.29

GY4 Axle Rear
4.53
GY5 Axle Front
3.65
GY7 TransAxle Final Drive
4.18
GY9 Axle Rear
4.31
GYS TransAxle Final Drive
3.65
H01 Axle Rear
3.07
H04 Axle Rear, SINGLE SPEED
4.11
H05 Axle Rear
3.73
H12 Axle Rear, 21000 LBS, EATON 21065S, SINGLE SPEED

H42 Axle Rear
6.17
H43 Axle Rear
5.43
HA3 Axle Rear, SINGLE SPEED
5.29
HC4 Axle Rear
4.56
HC7 Axle Rear, 7500 LBS, SINGLE SPEED
5.13
HC8 Axle Rear, SINGLE SPEED, TRUCK
3.21
HC9 Axle Rear
5.13
HE3 Axle Rear, 3500 LBS, SINGLE SPEED,
3.07
HE4 Axle Rear
3.40
HF7 Axle Rear, 10000 LBS, DANA 70, SINGLE
4.56
HF8 Axle Rear
4.88
HJ1 Axle Rear
4.55
HJ2 Axle Rear
5.86
HJ3 Axle Rear
4.75
HJ4 Axle Rear
6.50
HJ5 Axle Rear
5.57
HJ6 Axle Rear
4.78
HJ7 Axle Rear
4.88
HK1 Axle Rear
2.87
HK3 Axle Rear
6.14
HK9 Axle Rear 10000 LBS, SINGLE SPEED
5.86
HO4 Axle Rear
4.11
HO6 Axle Rear
4.63


The following figure presents differential cover and gasket shapes. Counting cover bolts and cover shapes is a common method to determine which ring gear diameter and differential you have in your rear wheel drive RWD vehicle. See the below paragraph before selecting the correct Dana parts.

gmdanadiffgaskets_large.jpg

 

 

 

 

 

 

 

 

 

 

 

When ordering Dana Spicer Differential Parts, provide a bill of material number. This number is stamped on the right hand side axle tube of your rear end. It's a number like: 603XX-X, 604XX-X or 605XX-X. With this number, you can tell exactly what components the factory used in the assembly of your rear end. 

billofmaterial_large.jpg

 

 
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