How can I Identify my GMC or Chevrolet rear end gear ratio?
Well.. this
can be done by the General Motors "Regular Production Option"
codes, also
called... RPO Codes. The codes
are provided by a tag labelled “Service Parts Identification” that's usually located
inside the drivers door panel or glove box.
These
plates contain valuable information about your GM vehicle. Assuming
that the rear end previously has not been swapped or modified, you can use these
plates for accurate identification of
your rear end / differential.
The list
below is a partial list of typical GM RPO Codes, specifically the codes
pertaining to Axle Identification, Differential Type and Gear Ratio.
The prefix
is usually F, G or H when referring to Axle Identification.
Code
|
Ratio Description
|
Ratio
|
FA0
|
Rear Axle
|
5.77:1
|
FA1
|
Rear 2 Speed
|
4.88:1/6.94:1
|
FA2
|
Rear 2 Speed
|
4.88:1/6.94:1
|
G44
|
Rear Axle
|
3.07:1
|
G72
|
Rear Axle
|
2.14:1
|
G75
|
Rear Axle
|
3.70:1
|
G76
|
Rear Axle / Posi / Limited Slip
|
3.36:1
|
G80
|
Rear Axle / Posi / Limited Slip
|
X
|
G81
|
Rear Axle / Posi / Limited Slip
|
X
|
G82
|
Rear Axle
|
4.56:1
|
G84
|
Rear Axle
|
4.10:1
|
G86
|
Rear Axle / Limited Slip
|
X
|
G87
|
Ring Gear
|
8.5"
|
G89
|
Ring Gear,
|
7.5"
|
G90
|
Rear Axle
|
3.15:1
|
G91
|
Rear Axle /
|
3.08:1
|
G92
|
Rear Axle
|
3.08:1
|
G94
|
Rear Axle
|
3.31:1
|
G96
|
Rear Axle
|
3.55:1
|
G97
|
Rear Axle
|
2.37:1
|
GH0
|
Rear Axle
|
3.54:1
|
GH2
|
Rear Axle
|
2.29:1
|
GH3
|
Rear Axle
|
2.77:1
|
GH4
|
Rear Axle
|
2.92:1
|
GH7
|
Rear Axle
|
2.73:1
|
GJ1
|
Rear Axle
|
5.38:1
|
GJ2
|
Rear Axle
|
5.13:1
|
GK7
|
Rear Axle
|
4.78:1
|
GK8
|
Rear Axle
|
4.33:1
|
GK9
|
Rear Axle
|
4.63:1
|
GL0
|
Rear Axle
|
5.13:1
|
GL3
|
Rear Axle
|
6.17:1
|
GM1
|
Rear Axle
|
2.59:1
|
GM2
|
Rear Axle
|
3.44:1
|
GM3
|
Rear Axle
|
3.45:1
|
GM4
|
Rear Axle
|
3.67:1
|
GM5
|
Rear Axle
|
3.89:1
|
GM6
|
Rear Axle
|
4.22:1
|
GM7
|
Rear Axle
|
3.68:1
|
GM8
|
Rear Axle
|
2.56:1
|
GN9
|
Rear Axle
|
4.11:1
|
GS1
|
Rear Axle
|
2.73:1
|
GS3
|
Rear Axle
|
3.73:1
|
GS4
|
Rear Axle
|
3.70:1
|
GS5
|
Rear Axle
|
4.11:1
|
GS6
|
Rear Axle
|
4.56:1
|
GS8
|
Rear Axle
|
3.94:1
|
GT1
|
Rear Axle
|
2.56:1
|
GT2
|
Rear Axle
|
2.29:1
|
GT4
|
Rear Axle (Dup of 5X1)
|
3.73:1
|
GT5
|
Rear Axle (Dup of GT8)
|
4.10:1
|
GT7
|
Rear Axle
|
3.33:1
|
GT8
|
Rear Axle (Dup of GT5)
|
4.10:1
|
GU1
|
Rear Axle
|
2.41:1
|
GU2
|
Rear Axle
|
2.73:1
|
GU3
|
Rear Axle
|
2.93:1
|
GU4
|
Rear Axle
|
3.08:1
|
GU5
|
Rear Axle
|
3.23:1
|
GU6
|
Rear Axle
|
3.42:1
|
GU7
|
Rear Axle
|
2.77:1
|
GU8
|
Rear Axle
|
3.9:1
|
GU9
|
Rear Axle
|
3.91:1
|
GV0
|
Rear Axle
|
3.55:1
|
GV1
|
Rear Axle
|
2.73:1
|
GV2
|
Rear Axle
|
5.83:1
|
GV3
|
Rear Axle
|
3.08:1
|
GV4
|
Rear Axle
|
3.36:1
|
GV5
|
Rear Axle
|
3.55:1
|
GV7
|
Rear Axle
|
4.11:1
|
GV8
|
Rear Axle
|
2.72:1
|
GV9
|
Rear Axle
|
4.25:1
|
GW2
|
Rear Axle
|
2.56:1
|
GW3
|
Rear Axle
|
2.56:1
|
GW4
|
Rear Axle
|
3.31:1
|
GW5
|
Rear Axle
|
2.73:1
|
GW6
|
Rear Axle
|
3.27:1
|
GW8
|
Rear Axle
|
4.10:1
|
GW9
|
Rear Axle (Dup of GU3)
|
2.93:1
|
GX1
|
Rear Axle
|
3.70:1
|
GX2
|
Rear Axle
|
3.07:1
|
GX4
|
Rear Axle
|
3.75:1
|
GX5
|
Rear Axle
|
4.09:1
|
GX6
|
Rear Axle
|
3.53:1
|
GY2
|
Rear Axle
|
3.31:1
|
GY4
|
Rear Axle
|
4.53:1
|
GY5
|
Front Axle
|
3.65:1
|
GY9
|
Rear Axle
|
4.31:1
|
H01
|
Rear Axle
|
3.07:1
|
H04
|
Rear Axle / Single Speed
|
4.11:1
|
H05
|
Rear Axle
|
3.73:1
|
H12
|
Rear Axle / Single Speed
|
21000 Lbs
|
H42
|
Rear Axle
|
6.17:1
|
H43
|
Rear Axle
|
5.43:1
|
HA3
|
Rear Axle / Single Speed
|
5.29:1
|
HC4
|
Rear Axle
|
4.56:1
|
HC7
|
Rear Axle / Single Speed
|
2.38:1
|
HC8
|
Rear Axle / Single Speed
|
3.21:1
|
HC9
|
Rear Axle
|
5.13:1
|
HE3
|
Rear Axle / Single Speed
|
3.07:1
|
HE4
|
Rear Axle
|
3.40:1
|
HF7
|
Rear Axle / Dana 70 /Single
|
4.56:1
|
HF8
|
Rear Axle
|
4.88:1
|
HJ1
|
Rear Axle
|
4.55:1
|
HJ2
|
Rear Axle
|
5.86:1
|
HJ3
|
Rear Axle
|
4.75:1
|
HJ4
|
Rear Axle
|
6.50:1
|
HJ5
|
Rear Axle
|
5.57:1
|
HJ6
|
Rear Axle
|
4.78:1
|
HJ7
|
Rear Axle
|
4.88:1
|
HK1
|
Rear Axle
|
2.87:1
|
HK3
|
Rear Axle
|
6.14:1
|
HK9
|
Rear Axle / Single Speed
|
5.86:1
|
HO4
|
Rear Axle
|
4.11:1
|
HO6
|
Rear Axle
|
4.63:1
|
247
|
Autoholic
|
VonSkip
|
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