Hey I have a question, my rear differential is bad so I want to change the axle from the junkyard. I opened the back panel to count the teeth in the gears. My pinion has 11 teeth and the big gear wheel has 41 teeth. So my ratio is around 3,72. Is this all I need or are there more things I have to pay attention?
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rear axle swap
- Thread starter DrPablo
- Start date
3.73 is a common ratio in GM trucks. If you have a 4x4 then you need to replace with the same ratio to match the front axle ratio. Using different ratio's will cause problems when in 4 wheel drive.
It would be a lot easier if you could just swap out the whole assembly. Assembly and gear from a S10 series trucks and SUV's should fit but the salvage yard can point to which will work.
To find the ratio, look at the codes on the service parts label in the glove box. Axle codes start with G
G11 RATIO TRANSAXLE FINAL DRIVE 2.56
G12 SUSPENSION REAR 12,000 LB (5,450 KG), AIR
G44 AXLE REAR 3.07 RATIO
G72 AXLE REAR, 2.14 RATIO
G75 AXLE REAR, 3.62 RATIO
G82 RATIO TRANSAXLE FINAL DRIVE 4.33
G82 RATIO TRANSAXLE FINAL DRIVE 4.56
G83 RATIO TRANSAXLE FINAL DRIVE 4.47
G84 AXLE REAR 3.70 RATIO
G84 AXLE REAR 4.10 RATIO
G85 AXLE REAR LIMITED SLIP, VAR 1
G86 AXLE LIMITED SLIP
G87 RING GEAR 8.50 INCH
G89 RING GEAR 7.50 INCH
G89 RATIO TRANSAXLE FINAL DRIVE 4.13
G90 AXLE REAR 3.15 RATIO
G90 SPECIAL HIGHWAY REAR AXLE RATIO 3.08
G91 AXLE REAR 6.83 RATIO
G92 AXLE REAR RATIO PERFORMANCE
G94 AXLE REAR, 3.31 RATIO
G95 AXLE REAR RATIO ECONOMY
G96 AXLE REAR, 3.55 RATIO
G97 AXLE REAR NO RATIO (TO BE USED WITH ELECTRIC VEHICLE)
G98 SEAL RR AXLE, OIL, STEMCO
GH0 AXLE REAR 3.54 RATIO
GH1 AXLE REAR 3.55 RATIO
GH2 AXLE REAR 2.29 RATIO
GH3 AXLE REAR 2.77 RATIO
GH4 AXLE REAR 2.92 RATIO
GH7 AXLE REAR W/DISC BRAKE, 2.73 RATIO, *BRASEIXOS*
GJ1 AXLE REAR 5.38 RATIO, 3,000 KG, SINGLE SPEED
GJ2 AXLE REAR 5.13 RATIO, 3,000 KG, SINGLE SPEED
GJ4 AXLE REAR 26,000 LB (11,794 KG), EATON 26,080 T, TWO SPEED
GK7 AXLE REAR 4.78 RATIO, 2,750 KG, SINGLE SPEED
GK8 AXLE REAR 4.33 RATIO, 16,500 KG, SINGLE SPEED
GK9 AXLE REAR 4.63 RATIO
GL0 AXLE REAR 5.13 RATIO
GM0 AXLE REAR 3.58 RATIO
GM1 AXLE REAR 2.59 RATIO
GM2 AXLE REAR 3.44 RATIO
GM3 AXLE REAR 3.45 RATIO
GM4 AXLE REAR 3.67 RATIO
GM5 AXLE REAR 3.89 RATIO
GM6 AXLE REAR 4.22 RATIO
GM7 AXLE REAR 3.68 RATIO
GM8 AXLE REAR 2.56 RATIO
GM9 AXLE REAR 3.63 RATIO
GN9 AXLE REAR 4.11 RATIO
GQ1 AXLE STD RATIO
GQ2 SUSPENSION REAR 15,000 LB (6,804 KG)
GS0 AXLE REAR 6.43 RATIO
GS1 AXLE REAR 2.73 RATIO
GS2 FLEET INCENTIVE KEY SPAN SERVICES (N/U/W-TRK CKGST)
GS3 AXLE REAR 3.73 RATIO
GS4 AXLE REAR 3.70 RATIO
GS5 AXLE REAR 4.11 RATIO
GS6 AXLE REAR 4.56 RATIO
GS8 RATIO TRANSAXLE FINAL DRIVE 3.94 (USE OPTION FX1)
GS9 AXLE REAR 3.46 RATIO
GT1 AXLE REAR 2.56 RATIO, 10,500 KG
GT2 AXLE REAR 4.77 RATIO
GT3 AXLE REAR 4.55 RATIO
GT4 AXLE REAR 3.73 RATIO
GT5 AXLE REAR 4.10 RATIO
GT6 RATIO TRANSAXLE FINAL DRIVE 4.19 (USE OPTION FV5)
GT7 AXLE REAR 3.33 RATIO
GT8 AXLE REAR 4.10 RATIO
GT9 AXLE REAR 2.87 RATIO
GTY AXLE WIDE TRACK
GU1 AXLE REAR 2.41 RATIO
GU2 AXLE REAR 2.73 RATIO
GU4 AXLE REAR 3.08 RATIO
GU5 AXLE REAR 3.23 RATIO
GU6 AXLE REAR 3.42 RATIO
GU7 AXLE REAR 2.77 RATIO
GU8 AXLE REAR 3.90 RATIO
GU9 AXLE FRONT 3.91 RATIO
GV0 AXLE FRONT 3.55 RATIO
GV1 AXLE REAR 2.73 RATIO
GV2 AXLE REAR 5.83 RATIO
GV3 AXLE REAR 3.08 RATIO
GV3 RATIO TRANSAXLE FINAL DRIVE 3.57 (USE OPTION FQ4)
GV4 AXLE REAR 5.428 RATIO
GV4 AXLE REAR 3.36 RATIO
GV5 AXLE FRONT 3.82 RATIO
GV5 AXLE REAR 3.55 RATIO
GV7 AXLE FRONT 4.05 RATIO
GV7 AXLE REAR 4.11 RATIO
GV8 AXLE REAR 2.72 RATIO
GV9 AXLE REAR 4.25 RATIO
GVW FAMILY CODE GVW RATING
GW1 AXLE REAR 3.91 RATIO
GW2 AXLE REAR 2.56 RATIO
GW3 AXLE REAR 2.56 RATIO
GW4 AXLE REAR 3.31 RATIO
GW5 AXLE REAR 2.73 RATIO
GW6 AXLE REAR 3.27 RATIO
GW8 AXLE REAR 4.10 RATIO
GW9 AXLE REAR 2.93 RATIO (DUP WITH GU3)
GX1 AXLE REAR 5.429 RATIO
GX1 AXLE REAR 3.70 RATIO
GX2 AXLE REAR 3.07 RATIO
GX3 RATIO TRANSAXLE FINAL DRIVE 3.33
GX6 AXLE REAR 3.53 RATIO
GX8 RATIO TRANSAXLE FINAL DRIVE 3.74 (USE OPTION FY2)
GXA SUSPENSION REAR 13,500 LB, TAPERED LEAF
GY2 AXLE REAR 4.30 RATIO
GY2 AXLE REAR 3.31 RATIO
GY3 RATIO TRANSAXLE FINAL DRIVE 4.29 (USE OPTION FV7)
GY4 AXLE REAR 4.53 RATIO
GY5 RATIO TRANSAXLE FINAL DRIVE 3.75
GY7 RATIO TRANSAXLE FINAL DRIVE 4.18 (USE OPTION FV2)
GY9 AXLE REAR 4.31 RATIO
GYS RATIO TRANSAXLE FINAL DRIVE 3.65
It would be a lot easier if you could just swap out the whole assembly. Assembly and gear from a S10 series trucks and SUV's should fit but the salvage yard can point to which will work.
To find the ratio, look at the codes on the service parts label in the glove box. Axle codes start with G
G11 RATIO TRANSAXLE FINAL DRIVE 2.56
G12 SUSPENSION REAR 12,000 LB (5,450 KG), AIR
G44 AXLE REAR 3.07 RATIO
G72 AXLE REAR, 2.14 RATIO
G75 AXLE REAR, 3.62 RATIO
G82 RATIO TRANSAXLE FINAL DRIVE 4.33
G82 RATIO TRANSAXLE FINAL DRIVE 4.56
G83 RATIO TRANSAXLE FINAL DRIVE 4.47
G84 AXLE REAR 3.70 RATIO
G84 AXLE REAR 4.10 RATIO
G85 AXLE REAR LIMITED SLIP, VAR 1
G86 AXLE LIMITED SLIP
G87 RING GEAR 8.50 INCH
G89 RING GEAR 7.50 INCH
G89 RATIO TRANSAXLE FINAL DRIVE 4.13
G90 AXLE REAR 3.15 RATIO
G90 SPECIAL HIGHWAY REAR AXLE RATIO 3.08
G91 AXLE REAR 6.83 RATIO
G92 AXLE REAR RATIO PERFORMANCE
G94 AXLE REAR, 3.31 RATIO
G95 AXLE REAR RATIO ECONOMY
G96 AXLE REAR, 3.55 RATIO
G97 AXLE REAR NO RATIO (TO BE USED WITH ELECTRIC VEHICLE)
G98 SEAL RR AXLE, OIL, STEMCO
GH0 AXLE REAR 3.54 RATIO
GH1 AXLE REAR 3.55 RATIO
GH2 AXLE REAR 2.29 RATIO
GH3 AXLE REAR 2.77 RATIO
GH4 AXLE REAR 2.92 RATIO
GH7 AXLE REAR W/DISC BRAKE, 2.73 RATIO, *BRASEIXOS*
GJ1 AXLE REAR 5.38 RATIO, 3,000 KG, SINGLE SPEED
GJ2 AXLE REAR 5.13 RATIO, 3,000 KG, SINGLE SPEED
GJ4 AXLE REAR 26,000 LB (11,794 KG), EATON 26,080 T, TWO SPEED
GK7 AXLE REAR 4.78 RATIO, 2,750 KG, SINGLE SPEED
GK8 AXLE REAR 4.33 RATIO, 16,500 KG, SINGLE SPEED
GK9 AXLE REAR 4.63 RATIO
GL0 AXLE REAR 5.13 RATIO
GM0 AXLE REAR 3.58 RATIO
GM1 AXLE REAR 2.59 RATIO
GM2 AXLE REAR 3.44 RATIO
GM3 AXLE REAR 3.45 RATIO
GM4 AXLE REAR 3.67 RATIO
GM5 AXLE REAR 3.89 RATIO
GM6 AXLE REAR 4.22 RATIO
GM7 AXLE REAR 3.68 RATIO
GM8 AXLE REAR 2.56 RATIO
GM9 AXLE REAR 3.63 RATIO
GN9 AXLE REAR 4.11 RATIO
GQ1 AXLE STD RATIO
GQ2 SUSPENSION REAR 15,000 LB (6,804 KG)
GS0 AXLE REAR 6.43 RATIO
GS1 AXLE REAR 2.73 RATIO
GS2 FLEET INCENTIVE KEY SPAN SERVICES (N/U/W-TRK CKGST)
GS3 AXLE REAR 3.73 RATIO
GS4 AXLE REAR 3.70 RATIO
GS5 AXLE REAR 4.11 RATIO
GS6 AXLE REAR 4.56 RATIO
GS8 RATIO TRANSAXLE FINAL DRIVE 3.94 (USE OPTION FX1)
GS9 AXLE REAR 3.46 RATIO
GT1 AXLE REAR 2.56 RATIO, 10,500 KG
GT2 AXLE REAR 4.77 RATIO
GT3 AXLE REAR 4.55 RATIO
GT4 AXLE REAR 3.73 RATIO
GT5 AXLE REAR 4.10 RATIO
GT6 RATIO TRANSAXLE FINAL DRIVE 4.19 (USE OPTION FV5)
GT7 AXLE REAR 3.33 RATIO
GT8 AXLE REAR 4.10 RATIO
GT9 AXLE REAR 2.87 RATIO
GTY AXLE WIDE TRACK
GU1 AXLE REAR 2.41 RATIO
GU2 AXLE REAR 2.73 RATIO
GU4 AXLE REAR 3.08 RATIO
GU5 AXLE REAR 3.23 RATIO
GU6 AXLE REAR 3.42 RATIO
GU7 AXLE REAR 2.77 RATIO
GU8 AXLE REAR 3.90 RATIO
GU9 AXLE FRONT 3.91 RATIO
GV0 AXLE FRONT 3.55 RATIO
GV1 AXLE REAR 2.73 RATIO
GV2 AXLE REAR 5.83 RATIO
GV3 AXLE REAR 3.08 RATIO
GV3 RATIO TRANSAXLE FINAL DRIVE 3.57 (USE OPTION FQ4)
GV4 AXLE REAR 5.428 RATIO
GV4 AXLE REAR 3.36 RATIO
GV5 AXLE FRONT 3.82 RATIO
GV5 AXLE REAR 3.55 RATIO
GV7 AXLE FRONT 4.05 RATIO
GV7 AXLE REAR 4.11 RATIO
GV8 AXLE REAR 2.72 RATIO
GV9 AXLE REAR 4.25 RATIO
GVW FAMILY CODE GVW RATING
GW1 AXLE REAR 3.91 RATIO
GW2 AXLE REAR 2.56 RATIO
GW3 AXLE REAR 2.56 RATIO
GW4 AXLE REAR 3.31 RATIO
GW5 AXLE REAR 2.73 RATIO
GW6 AXLE REAR 3.27 RATIO
GW8 AXLE REAR 4.10 RATIO
GW9 AXLE REAR 2.93 RATIO (DUP WITH GU3)
GX1 AXLE REAR 5.429 RATIO
GX1 AXLE REAR 3.70 RATIO
GX2 AXLE REAR 3.07 RATIO
GX3 RATIO TRANSAXLE FINAL DRIVE 3.33
GX6 AXLE REAR 3.53 RATIO
GX8 RATIO TRANSAXLE FINAL DRIVE 3.74 (USE OPTION FY2)
GXA SUSPENSION REAR 13,500 LB, TAPERED LEAF
GY2 AXLE REAR 4.30 RATIO
GY2 AXLE REAR 3.31 RATIO
GY3 RATIO TRANSAXLE FINAL DRIVE 4.29 (USE OPTION FV7)
GY4 AXLE REAR 4.53 RATIO
GY5 RATIO TRANSAXLE FINAL DRIVE 3.75
GY7 RATIO TRANSAXLE FINAL DRIVE 4.18 (USE OPTION FV2)
GY9 AXLE REAR 4.31 RATIO
GYS RATIO TRANSAXLE FINAL DRIVE 3.65