Section 2 (Drive Axle Ratio Identification): Identification
WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1984 GMC Vandura Special, 1984 GMC Vandura, 1984 GMC Value Van, 1984 GMC Suburban, and 1984 GMC S15 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Identification code for rear axles is stamped on rear surface of right rear axle tube. Identification code for front axles is stamped on top rear of left axle tube. On Dana built front axles, axle ratio code is on tape stripe around right front axle tube.
GENERAL MOTORS AXLE RATIO IDENTIFICATION (FRONT)
| Code | Ratio |
|---|---|
| BRW, GRK, SAA, SDH | 2.73:1 |
| BSX, GRL, SBA, SBB | 3.08:1 |
| TFA, WC | 3.23:1 |
| THA, THD, WF, WH | 3.42:1 |
| TBA, TBB, TBD, TBF, TBJ, WM | 3.73:1 |
| TCA, TCB, TCC, MFA | 4.10:1 |
| TDA, TDB | 4.56:1 |
GENERAL MOTORS AXLE RATIO IDENTIFICATION (REAR, NON-LOCKING)
| Code | Ratio |
|---|---|
| BN3, BW3 | 2.56:1 |
| BB3, BRA, BRD, BRC, BRD, BRJ, BRM, BRR, BX3, BZA, BZB | 2.73:1 |
| BC3, BSA, BSC, BSD, BSK, BSN, BRX, BS3, BY3, CM3, CR3 | 3.08:1 |
| BAA, BAB, BAC, BAD, BCS | 3.21:1 |
| BDB, BDD, CZN | 3.23:1 |
| BBC, BBD, BBJ, BBK, BBN, BBR BBU, BBX, BD3, BT3, BWH, BZ3, CX3 | 3.42:1 |
| BCA, BCC, BCF, BCW, BCX, BCY, BFA, BFH, BFN, BU3, BUC, BUK, BVA, CY3 | 3.73:1 |
| BCZ, BHA, BHC, BHR, BHW, BHY, BJC | 4.10:1 |
| BTA, BTC, BTH | 4.11:1 |
| BKA, BKC, BKM, BKR, BKU, BKX, BKZ, BMB, CZT | 4.56:1 |
| BMA, GDA | 5.13:1 |
GENERAL MOTORS AXLE RATIO IDENTIFICATION (REAR, LOCKING)
| Code | Ratio |
|---|---|
| CB3, CH3 | 2.56:1 |
| BH3, BRB, BRF, BRH, CC3, CJ3, CS3, CV3 | 2.73:1 |
| AZ3, BJ3, BSB, BSF, BSH, CD3, CW3 | 3.08:1 |
| BDC, BDF, CZU | 3.23:1 |
| BA3, BBA, BBF, BBH, BBM, BBS, BBT, CF3, C23 | 3.42:1 |
| BCB, BCD, BCH, BCJ, BCR, BDA, BFC, BFD, BFF, BFJ, BFM, BFR, BFW, BFX, BFY, BM3, CZW, DA3 | 3.73:1 |
| BFC, BHB, BHD, BHH, BHJ, BHS, BHU, BJA, BJB, BZX | 4.10:1 |
| BKB, BKD, BKN, BKS, BKW, BKY, BMA, BMC, BMF, CZY | 4.56:1 |