GM RPO Codes – Factory Identification Labels and Interpretation

GM RPO Codes, or General Motors "Regular Production Option" codes contain lots of valuable information about your GM vehicle. Identify your GMC or Chevrolet rear terminate gear ratio by the RPO Codes, usually located on the placard labeled "Service Parts Identification" inside the drivers door console or glove box. (Accurate identification using the GM RPO code assumes that the rear terminate has not been previously modified) The prefix is usually F, G or H when referring to Axle Identification. The list below is a partial list of typical GM RPO Codes, specifically the codes pertaining to Axle Identification, Differential Blazon and Gear Ratio.

RPO Code Description Ratio
G11 Transaxle Terminal 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 Beam
G82 Axle Rear iv.56
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G84 Beam Rear 4.10
G86 Axle Rear, Limited Slip
G87 Ring Gear, eight.5″
G89 Ring Gear, 7.v″
G90 Rear iii.15
G91 Special Highway Rear Beam 3.08
G94 Axle Rear 3.31
G96 Beam Rear iii.55
G97 Axle Rear ii.73
GH0 Axle Rear iii.54
GH2 Axle Rear 2.29
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GH3 Beam Rear 2.77
GH4 Axle Rear 2.92
GH7 Axle Rear 2.73
GJ1 Axle Rear 5.38
GJ2 Axle Rear 5.xiii
GK7 Axle Rear iv.78
GK8 Axle Rear 4.33
GK9 Axle Rear 4.63
GL0 Axle Rear 5.xiii
GL3 Axle Rear 6.17
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GM1 Axle Rear two.59
GM2 Axle Rear 3.44
GM3 Beam Rear 3.45
GM4 Beam Rear 3.67
GM5 Axle Rear 3.89
GM6 Axle Rear 4.22
GM7 Beam Rear 3.68
GM8 Axle Rear 2.56
GN9 Axle Rear 4.11
GS1 Axle Rear 2.73
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GS3 Beam Rear 3.73
GS4 Axle Rear iii.seventy
GS5 Axle Rear iv.11
GS6 Beam Rear iv.56
GS8 Axle Rear three.94
GT1 Axle Rear 2.56
GT2 Axle Rear two.29
GT4 Axle Rear (Dup of 5X1) iii.73
GT5 Axle Rear (Dup of GT8) 4.ten
GT7 Axle Rear 3.33
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GT8 Axle Rear (Dup of GT5) 4.10
GU1 Beam Rear ii.41
GU2 Axle Rear two.73
GU3 Axle Rear 2.93
GU4 Axle Rear 3.08
GU5 Axle Rear iii.23
GU6 Axle Rear 3.42
GU7 Axle Rear 2.77
GU8 Axle Rear 3.90
GU9 Beam Rear iii.91
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GV0 Axle Rear 3.55
GV1 Axle Rear ii.73
GV2 Axle Rear 5.83
GV3 Axle Rear 3.08
GV4 Axle Rear three.36
GV5 Axle Rear three.55
GV7 Axle Rear 4.11
GV8 Axle Rear ii.72
GV9 Axle Rear 4.25
GW2 Axle Rear ii.56
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GW3 Beam Rear 2.56
GW4 Axle Rear three.31
GW5 Axle Rear two.73
GW6 Axle Rear 3.27
GW8 Axle Rear four.10
GW9 Axle Rear (Dup of GU3) 2.93
GX1 Axle Rear 3.70
GX2 Axle Rear iii.07
GX3 Transaxle Final Bulldoze 3.33
GX4 Beam Rear 3.75
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GX5 Beam Rear iv.09
GX6 Axle Rear 3.53
GX8 Transaxle Concluding Drive iii.74
GY2 Axle Rear 3.31
GY3 Transaxle Final Drive four.29
GY4 Beam Rear 4.53
GY5 Axle Front 3.65
GY7 Transaxle Terminal Drive 4.18
GY9 Beam Rear 4.31
GYS Transaxle Last Drive 3.65
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H01 Axle Rear iii.07
H04 Axle Rear, Single Speed 4.11
H05 Axle Rear three.73
H12 Axle Rear, 21000 Lbs, Eaton 21065S, Unmarried Speed
H42 Axle Rear half dozen.17
H43 Axle Rear 5.43
HA3 Beam Rear, Unmarried Speed v.29
HC4 Axle Rear 4.56
HC7 Beam Rear, 7500 Lbs, Unmarried Speed 2.38
HC8 Axle Rear, Unmarried Speed, Truck 3.21
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HC9 Axle Rear 5.13
HE3 Axle Rear, 3500 Lbs, Unmarried Speed iii.07
HE4 Beam Rear 3.40
HF7 Axle Rear, 10000 Lbs, Dana seventy, Single four.56
HF8 Axle Rear iv.88
HJ1 Axle Rear 4.55
HJ2 Axle Rear 5.86
HJ3 Axle Rear 4.75
HJ4 Axle Rear vi.fifty
HJ5 Axle Rear v.57
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HJ6 Axle Rear 4.78
HJ7 Axle Rear 4.88
HK1 Axle Rear ii.87
HK3 Axle Rear six.14
HK9 Axle Rear 10000 Lbs, Single Spd five.86
HO4 Axle Rear 4.11
HO6 Axle Rear iv.63