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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 end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. (Accurate identification using the GM RPO code assumes that the rear end 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 Type and Gear Ratio.

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RPO Code Description Ratio 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides G84 Axle Rear 4.10 G86 Axle Rear, Limited Slip G87 Ring Gear, 8.5″ G89 Ring Gear, 7.5″ 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 5X1) 3.73 GT5 Axle Rear (Dup of GT8) 4.10 GT7 Axle Rear 3.33 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides GT8 Axle Rear (Dup of 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 GU3) 2.93 GX1 Axle Rear 3.70 GX2 Axle Rear 3.07 GX3 Transaxle Final Drive 3.33 GX4 Axle Rear 3.75 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 2.38 HC8 Axle Rear, Single Speed, Truck 3.21 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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 West Coast Differentials Tech Support / Order Hotline: (800)510-0950 Call to Order before 4PM PST and most Parts Ship Out TODAY! Find Replacement Axle Parts for your GM Vehicle in our Application Guides 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

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If you are unable to find the GM RPO Codes Label, a GM dealership can usually tell you what you have using the VIN number of your vehicle. Our parts experts can also help you with identification with year, make and model information. We cannot use casting numbers for identification.