CORPORATE BUILT
Axle identification code for rear axles is stamped on forward surface of right axle tube, 3-5" outboard of carrier (6-8" on 20 and 30 series trucks). Location of identification code for front axles not available from manufacturer.
DANA BUILT
Identification code is stamped on rear surface of right axle tube. In addition, the 3-digit axle code appears on tape strip attached to outboard end of axle tube.
ROCKWELL BUILT
Information not available from manufacturer.
| Application & Code | Ratio |
|---|
| 7.5" Ring Gear |
| FAG, FAK (1) | 3.08:1 |
| FAS, FAT (1) | 3.23:1 |
| FAH, FAL (1) | 3.42:1 |
| FAM, FAN (1) | 3.73:1 |
| FAP, FAR (1) | 4.10:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
ASTRO & SAFARI REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| KZJ, KZN, KZT, KZY (1) | 2.73:1 |
| KZK, KZU, LAC, LAJ, KZP (1) , KZZ (1) , LAF (1) , LAM (1) | 3.08:1 |
| KZL, KZW, LAD, LAK, KZR, LAA, LAG, LAN | 3.42:1 |
| KZM, KZX, KZS, LAB | 3.73:1 |
| 9.5" Ring Gear |
| KGT, KGX, KHB (1) , KHF (1) | 3.42:1 |
| KGU, KGY, KHC (1) , KHG (1) | 3.73:1 |
| KGW, KGZ, KHD (1) , KHH (1) | 4.10:1 |
| KHA, KHJ (1) | 4.56:1 |
| 10.5" Ring Gear |
| KJB | 3.42:1 |
| KJC, LHA | 3.73:1 |
| KJD, LHB | 4.10:1 |
| LHC | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"C" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| PSR, PTA, PFT (1) , PSW (1) | 3.08:1 |
| PSS, PTB, PSX (1) , PTG (1) | 3.42:1 |
| PST, PTC, PSY (1) , PTH (1) | 3.73:1 |
| 9.5" Ring Gear |
| HBG, KCT (1) | 3.23:1 |
| HBB, KCR (1) | 3.73:1 |
| HBD, KCS (1) | 4.10:1 |
| PBJ, KCU (1) | 4.56:1 |
| 9.75" Ring Gear (DANA) |
| BJH, GWG | 4.10:1 |
| BKH, GWF | 4.56:1 |
| 10.5" Ring Gear (DANA) |
| HNA | 3.42:1 |
| HNB, HNH | 3.73:1 |
| BJJ, HNC, HNJ | 4.10:1 |
| BKJ | 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 |
| LAP, LAU, LBB, LGB, LAS (1) , LAY (1) , LBD (1) , LBJ (1) | 3.42:1 |
| LAR. LAW, LBC, LBH, LAT (1) , LAZ (1) , LBF (1) , LBK (1) | 3.73:1 |
| LAX, LAB (1) | 4.10:1 |
| 9.5" Ring Gear |
| KHK, KHN, KHT (1) , KHX (1) | 3.42:1 |
| KHL, KHP, KHU (1) , KHY (1) | 3.73:1 |
| KHM, KHR, KHW (1) , KHZ (1) | 4.10:1 |
| KHS, KJA (1) | 4.56:1 |
| 10.5" Ring Gear |
| KJF | 3.42:1 |
| KJG | 3.73:1 |
| KJH | 4.10:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"K" SERIES REAR AXLE RATIO IDENTIFICATION
| Code | Ratio |
|---|
| ZBK, ZGS, ZHW | 3.42:1 |
| ZBL, ZGT, ZHX | 3.73:1 |
| ZBM, ZGU, ZHY | 4.10:1 |
| ZHZ | 4.56:1 |
"K" SERIES FRONT AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 9.5" Ring Gear |
| GUC, GUL, KCX (1) , KDA (1) | 3.73:1 |
| GUD, GUM | 4.10:1 |
| 10.5" Ring Gear |
| HJN, HJU, HJS (1) , HJY (1) , KSS (1) | 3.73:1 |
| HJP, HJW, HKH | 4.10:1 |
| HJR, HJX, HKJ, HJT (1) , HJZ (1) , HKL (1) | 4.56:1 |
| HKK | 5.13:1 |
| 10.5" Ring Gear (DANA) |
| LBL, PBP | 4.56:1 |
| PZU | 4.63:1 |
| LBM, PBR | 4.88:1 |
| LBN | 5.13:1 |
| 10.5" Ring Gear (ROCKWELL) PJS | 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 |
|---|
| 8.5" Ring Gear |
| PAL, PAR (1) | 2.73:1 |
| PAM, PAS (1) | 3.08:1 |
| PAN, PAT (1) | 3.42:1 |
| PAP, PAU (1) | 3.73:1 |
| 9.5" Ring Gear |
| GUK, KCZ (1) | 3.42:1 |
| GUL, KDA (1) | 3.73:1 |
| GUM, KDB (1) | 4.10:1 |
| GUN, KDC | 4.56:1 |
| 10.5" Ring Gear |
| KBW, KBY, KMW, KBX (1) , KBZ (1) , KMX (1) | 3.42:1 |
| HKP, HBW, GDP, HFP, HFY, HKS (1) , HBZ (1) , HFT (1) , HHL (1) | 3.73:1 |
| GDR, HFR, HFZ, HKR, HBX, HFL (1) , HKT (1) , HFU (1) , HHM (1) | 4.10:1 |
| HBY, GDS, HFS, HDZ, HFM (1) , HFW (1) , HHN (1) | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"R" SERIES REAR AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 7.5" Ring Gear |
| GAJ, PML (1) | 3.42:1 |
| GAK, HKB, HZP (1) | 3.73:1 |
| HKC, GAL, HZR (1) , HZU (1) | 4.11:1 |
| 7.625" Ring Gear |
| KUK, KUN | 3.08:1 |
| PMM, KUR (1) , KUS (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 |
| ZAD | 3.42:1 |
| ZAL | 3.73:1 |
| ZAM | 4.11:1 |
"T" SERIES FRONT AXLE RATIO IDENTIFICATION
| Application & Code | Ratio |
|---|
| 8.5" Ring Gear |
| PAW, PZX (1) | 2.73:1 |
| PAY, PBH, PBB (1) , PBL (1) | 3.08:1 |
| PAZ, PBT, PBC (1) , PBM (1) | 3.42:1 |
| PBA, PBK, PBD (1) , PBN (1) | 3.73:1 |
| 9.5" Ring Gear |
| GZF, KDH (1) | 3.42:1 |
| GZG, KDJ (1) | 3.73:1 |
| GZH, KDK (1) | 4.10:1 |
| 10.5" Ring Gear |
| GDP, HHP, HHX, HKU, HHT (1) , HJK (1) , HKW (1) | 3.73:1 |
| GDR, HHR, HHY, HHU (1) , HJL (1) | 4.10:1 |
| GDS, HHS, HHZ, HKX, HHW (1) , HJM (1) , HKY (1) | 4.56:1 |
| (1) With positive traction, limited slip differential. |
| (1) | With positive traction, limited slip differential. |
"V" SERIES REAR AXLE RATIO IDENTIFICATION
| Code | Ratio |
|---|
| ZGA, ZGB | 2.73:1 |
| ZGC, ZGD | 3.08:1 |
| ZGH, ZGJ, ZGF, ZGG | 3.42:1 |
| ZGM, ZGN, ZGK, ZGL, ZFR (1) , ZFS (1) | 3.73:1 |
| ZGP, ZGR, ZFT (1) , ZFU (1) | 4.10:1 |
| ZFW (1) , ZFX (1) | 4.56:1 |
| (1) DANA-built front axle. |
| (1) | DANA-built front axle. |
"V" SERIES FRONT AXLE RATIO IDENTIFICATION
