MODEL IDENTIFICATION
| Series (1) | Model |
|---|
| "C" | 2WD Pickup, Sierra & Suburban |
| "G" | RWD Van |
| "K" | 4WD Blazer, Pickup, Sierra, Suburban & Yukon |
| "L" | All-Wheel Drive Astro & Safari |
| "M" | 2WD Astro & Safari |
| "P" | Commercial Van/Motorhome |
| "S" | 2WD Blazer, Jimmy, Pickup & Sonoma |
| "T" | Bravada, 4WD Blazer, Jimmy |
| *** | Pickup, Sonoma, Syclone & Typhoon |
| (1) Vehicle series is fifth character of VIN. |
| (1) | Vehicle series is fifth character of VIN. |
AXLE RATIO & IDENTIFICATION
| Application & Code | Ratio |
|---|
| 7.625" Ring Gear |
| SKY, ZYD, ZYH | 3.42:1 |
| SKZ, ZYF | 3.73:1 |
ASTRO & SAFARI FRONT AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| XPN (1) , XRT (1) | 3.08:1 |
| UUS, XPF, XPJ (1) , XPM, XPP (1) | 3.42:1 |
| UUU, UUW (1) , XPG, XPK (1) | 3.73:1 |
| 9.5" Ring Gear |
| RYA, RYF (1) , TXW, TXZ (1) | 3.42:1 |
| RYB, RYG (1) , TXX, TYA (1) | 3.73:1 |
| RYC, RYH (1) , SJA, TXY, TYB (1) , XRC | 4.10:1 |
| RYD, RYJ (1) | 4.56:1 |
| 10.5" Ring Gear |
| RYK, RYN (1) | 3.42:1 |
| RYL, RYP (1) , SJM, SZX (1) | 3.73:1 |
| RYM, RYR (1) , SJN, SJR (1) , SJT, SJW (1) | 4.10:1 |
| RDP, SJP, SJS (1) , SJU, SJX (1) | 4.56:1 |
| 11" Ring Gear (UXG) | 4.63:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"C" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 10.5" Ring Gear |
| XUA, XUB (1) , RZJ, RZM (1) , SFB | 3.73:1 |
| SFF (1) , SFJ, SFM, SJM, SZZ | 3.73:1 |
| RZK, RZN (1) , SFC, SFG (1) , SFK, SFN (1) , SFX | 4.10:1 |
| SFY (1) , SJW (1) , SZW (1) , SZS, XUC, XUD (1) | 4.10:1 |
| RLK (1) , RLZ, RZL, RZP (1) , SFD, SFH (1) | 4.56:1 |
| SFL, SFP (1) , SFZ, SGA (1) , XAF | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"C/K" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| RKF, RKG (1) | 3.08:1 |
| RKH, RKJ (1) | 3.42:1 |
| RKK, RKL (1) | 3.73:1 |
| 9.5" Ring Gear |
| RKM, RKU | 3.23:1 |
| RKX, RKZ | 3.73:1 |
| RKY (1) , RLA | 4.10:1 |
| RKR, RKW (1) | 4.56:1 |
| 10.5" Ring Gear |
| RMU, RMX (1) , SYK, SYP (1) | 3.42:1 |
| RMW, RMY (1) , RMA, RMC (1) , SYL, SYR (1) , XSX, XSZ (1) | 3.73:1 |
| RLW, RLZ (1) , RMB, RMD (1) , SYM, SYS (1) , XSY, XTA (1) | 4.10:1 |
| RMG, RMJ (1) , SYN, SYT (1) , XTB, XTC (1) | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"G" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| UUX, UUY (1) , XRA (1) , XRD, XRF (1) , XPR, XPU (1) , XPY | 3.42:1 |
| UUZ, UWA (1) , XPC, XPS, XPW (1) , XPZ, XRB (1) , XRH (1) , XRG | 3.73:1 |
| XPX (1) , XPT | 4.10:1 |
| 9.5" Ring Gear |
| TXN, TXS (1) , RYS, RYX (1) | 3.42:1 |
| TXP, TXT (1) , RYT, RYY (1) | 3.73:1 |
| TXR, TXU (1) , RYU, RYZ (1) | 4.10:1 |
| RYW, RZA (1) | 4.56:1 |
| 10.5" Ring Gear |
| RZB, RZF (1) | 3.42:1 |
| RDM, RZC, RZG (1) , SZY | 3.73:1 |
| RZD, RZH (1) , RDN, RDR (1) , RLG, RLH (1) , XPT, XPX (1) | 4.10:1 |
| RDP, RDS (1) , RLJ | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"K" SERIES REAR AXLE RATIO IDENTIFICATION
| Code | Ratio |
|---|
| ZHW, ZLS | 3.42:1 |
| ZBL, ZGT | 3.73:1 |
| (1) No other information is available from manufacturer. |
| (1) | No other information is available from manufacturer. |
"K" SERIES FRONT AXLE RATIO IDENTIFICATION (1)
| Application & Code | Ratio |
|---|
| 10.5" Ring Gear |
| SDK, SGB, SDN (1) , SDR, SDU (1) | 3.73:1 |
| SDL, SDS, SDX | 4.10:1 |
| SDM, SDP, SDT, SDW (1) , SDY, SFA (1) , TJT, TJX | 4.56:1 |
| TJY (1) | 4.88:1 |
| SDZ, UWU | 5.13:1 |
| 11.0" Ring Gear |
| UWH | 4.63:1 |
| TFT, TFU, UWJ | 5.13:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"P" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 7.5" Ring Gear |
| UBA, UBB (1) , XUF, XUG | 3.73:1 |
| UBC, UBD (1) , XUH, XUJ (1) | 4.11:1 |
| 7.625" Ring Gear |
| TFY | 2.73:1 |
| TFZ (1) , TGA, TGB, UBJ, UBR, USZ, UTA, UWG | 3.08:1 |
| SZM, SZN (1) , TBS, TGF, TGH (1) , UBK, UBL (1) | 3.42:1 |
| UBT (1) , UTB, UTC (1) , UUL (1) , XAZ (1) | 3.42:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"S" & "T" SERIES REAR AXLE RATIO IDENTIFICATION
| Code | Ratio |
|---|
| ZAH | 3.08:1 |
| SKY, ZXC, ZYD, ZYH | 3.42:1 |
| SKZ, ZYF | 3.73:1 |
| (1) No other information is available from manufacturer. |
| (1) | No other information is available from manufacturer. |
"T" SERIES FRONT AXLE RATIO IDENTIFICATION (1)
