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| Axle Codes |
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Tom Lorek - tlorek@dowagro.com"
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The rear axle ratio, differential type, manufacturer, and build dateinformation is stamped on the right axle tube (as viewed from the front of the car) on the forward side... a real b*tch to see when it's still in the car. The first 3 digits indicate the axle code, the next one indicates manufacturer (B=Buick, O=Olds, C=Chevy, P=Pontiac), the next is Julian date it was built and the last it the shift it was made on. Limited slip rearshad a tag on the differential cover that stated it need posi fluid... that's usually missing, if the cover has ever been off. However, a "B" in the axle code (i.e., 2BX) usually indicates a posi.
The 7.5" rears have a differential cover that is smooth and kind of a squared off oval shape. The 8.5" rears have a rounder shaped cover with a raisedhorizontal area in the middle.
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| THM350 | 196 "C" 49 State |
2.73 | 2AB | 2BB | STD |
| THM350 | 231 "A" Cal 49 State |
2.73 | 2AB | 2BB | STD |
| THM350 | 231 "A" 49 State |
3.23 | 2AD | 2BD | OPT |
| THM350 | 231 "A" 49 State |
2.41 | 2AJ | 2BJ | OPT |
| THM350 | 231 "A" Hi Altitude |
3.23 | 2AD | 2BD | STD |
| THM350 | 231 "G" 49 State |
2.73 | 2AB | 2BB | STD |
| THM350 | 231 "3" 49 State |
2.73 | 2AB | 2BB | STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.41 | 7.5" | AZ, BZ |
| 2.56 | 7.5" | RY, SY, RC, SC, AA, BA |
| 2.73 | 7.5" | AX, BX, RS, SX, RD, SD, AB, BB |
| 2.93 | 7.5" | AG, BG |
| 3.23 | 7.5" | RU, SU, AU, BU, RG, SG |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| THM350 | 3.8 (LD5) A | 2.41 | 2AJ | 2BJ | STD |
| THM350 | 3.8 (LD5) A | 2.73 | 2AB | 2BB | OPT |
| THM350 | 3.8 (LD5) A | 3.23 | 2AD | 2BD | OPT |
| THM350 | 3.8 (LD5) High Alt |
3.23 | 2AD | 2BD | STD |
| THM350 | 3.8 (LD5) A | 2.73 | 2RX | 2BX | STD |
| THM350 | 3.8 (LD5) A | 3.23 | 2AU | 2BU | OPT |
| THM350 | 3.8 (LD5) A Calif |
3.23 | 2AU | 2BU | OPT |
| THM350 | 3.8 (LC6) 2 Calif |
2.73 | 2AB | 2BB | STD |
| THM350 | 3.8 (LC6) 2 Calif |
2.73 | 2RX | 2BX | STD |
| THM350 | 3.8 (LC8) 3 | 2.41 | 2AJ | 2BJ | STD |
| THM350 | 3.8 (LC8) 3 | 2.73 | 2AB | 2BB | OPT |
| THM350 | 3.8 (LC8) 3 | 3.08 | 2AC | --- | OPT |
| THM350 | 3.8 (LC8) 3 | 2.41 | 2AJ | 2BJ | STD |
| THM350 | 3.8 (LC8) 3 | 2.73 | 2AB | 2BB | OPT |
| THM350 | 3.8 (LC8) 3 Calif |
2.73 | 2AB | 2BB | STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.14 | 7.5" | RH |
| 2.29 | 7.5" | RA, AH, BH, AT, BT |
| 2.41 | 7.5" | AJ, BJ, AZ, BZ |
| 2.56 | 7.5" | RC, AA, BA, AY, BY |
| 2.73 | 7.5" | AX, BX, RX, RD, AB, BB |
| 2.93 | 7.5" | AG, BG |
| 3.08 | 7.5" | AC, BC |
| 3.23 | 7.5" | AD, BD, SC, RU, AU, BU, RG |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| THM350 | 3.8 (LC8) 3 | 2.41 | 6RB | 6BJ | STD |
| THM350 | 3.8 (LC8) 3 | 2.73 | 6AB | 6BB | OPT |
| THM350 | 3.8 (LC8) 3 | 2.73 | 6RD | 6BB | STD |
| THM350 | 3.8 (LC8) 3 | 3.08 | 6AC | --- | OPT |
| THM350 | 3.8 (LC8) 3 | 2.41 | 6RB | 6BJ | STD |
| THM350 | 3.8 (LC8) 3 | 2.73 | 6AB | 6BB | OPT |
| THM350 | 3.8 (LC8) 3 Calif |
2.73 | 6AB | 6BB | STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.29 | 7.5" | AH, BH, AT, BT |
| 2.41 | 7.5" | AJ, BJ, AZ, BZ |
| 2.56 | 7.5" | AY, BY |
| 2.73 | 7.5" | AX, BX, RX, AB, BB |
| 2.93 | 7.5" | AG, BG, AW, BW |
| 3.08 | 7.5" | AC, BC, AV |
| 3.23 | 7.5" | AU, BU |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| M64/Man 3 | 3.8 (LD5) | 3.08 | 8AC | 8BC | STD |
| MX2/350C | 3.8 (LD5) | 2.41 | 8AJ | 8BJ | STD |
| 3.08 | 8AC | 8BC | OPT | ||
| 3.23 | 8AD | 8BD | OPT | ||
| MX2/350C M33/350 |
3.8 (LC8) | 2.73 | 8AB | 8BB | STD |
| 3.08 | 8AC | 8BC | OPT | ||
| MV9/200C | 4.3 (LS5) Diesel |
2.29 | 8AH | 8BH | STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.29 | 7.5" | AH, AT, BH, BT |
| 2.41 | 7.5" | BJ, AJ, BZ, AZ |
| 2.56 | 7.5" | BY, AY |
| 2.73 | 7.5" | AB, BB, AX, BX, RX |
| 2.93 | 7.5" | AG, BG, AW, BW |
| 3.08 | 7.5" | AC, AV, BC |
| 3.23 | 7.5" | AU, BU |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| MX2/350C M31/250C |
3.8 (LD5) | 2.41 | 2AJ | 2BJ | STD |
| 3.08 | 2AC | 2BC | OPT | ||
| 3.23 | 2AD | 2BD | OPT | ||
| MX2/350C | 3.8 (LC8) | 3.08 | 2AC | 2BC | STD |
| MX2/350C | 4.1 (LC4) | 2.41 | 2AJ | 2BJ | STD |
| MV4/350C MV2/350C |
5.7 (LF9) | 2.29 | 2AH | 2BH | STD |
| MV4/350C MV2/350C |
4.3 (LT6) Diesel |
2.41 | 2AJ | 2BJ | STD |
| 2.56 | 2AA | 2BA | Hi Alt STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.41 | 7.5" | BJ, AJ, BZ, AZ, BM, AM, CC, CQ, RZ, CU, RB, CH |
| 2.56 | 7.5" | BY, AY, CE, CN, CI, CV, BA, AA, RC, CL, CY, RY, RD, CM, CZ |
| 2.73 | 7.5" | AB, BL, AL, AX, BX, CW, CD, CR, BB, RX, CJ |
| 2.93 | 7.5" | AG, BG, AW, BW, RW |
| 3.08 | 7.5" | AC, BC, AV, RF, RV, BV |
| 3.23 | 7.5" | AD, BD, AU, BU, RG, RU, AE, BE |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | Std/Opt |
| MX2/350C M31/250C |
3.8 (LD5) | 2.41 | 2AJ | 2BJ | STD |
| 3.08 | 2AC | 2BC | OPT | ||
| 3.23 | 2AD | 2BD | OPT | ||
| MX2/350C | 3.8 (LC8) | 3.08 | 2AC | 2BC | STD |
| MX2/350C | 4.1 (LC4) | 2.41 | 2AJ | 2BJ | STD |
| MV4/350C MV2/350C |
5.7 (LF9) | 2.29 | 2AH | 2BH | STD |
| MV4/350C MV2/350C |
4.3 (LT6) Diesel |
2.41 | 2AJ | 2BJ | STD |
| 2.56 | 2AA | 2BA | Hi Alt STD |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.41 | 7.5" | RB, CC, AJ, AM, BM, CG, BJ, RZ, CH, AZ, BZ, CU, CK, CX |
| 2.56 | 7.5" | RC, CE, AA, CN, BA, CI, AY, CV, BY, RY, CL, CY |
| 2.73 | 7.5" | RD, CD, AB, AL, BL, CR, BB, RX, CJ, AX, CW, BX, CM, CZ |
| 2.93 | 7.5" | RE, AG, BG, RW, AW, BW |
| 3.08 | 7.5" | RF, AC, BC, RV, AV, BV |
| 3.23 | 7.5" | RG, AD, BD, RU, AU, BU |
| 3.42 | 7.5" | AE, RK, BE |
| 3.73 | 7.5" | AF, BF |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | RPO Code |
| MV9/200C M31/250C |
3.8 (LD5) A | 2.41 | 2AJ | 2BJ | GU1 |
| 2.73 | 2AB | 2BB | GU2 | ||
| MV4/350C MV2/350C |
4.3 (LT6) Diesel V |
2.93 | 2AG | 2BG | GW9 |
| MV9/200C M31/250C MW9/200-4R |
4.1 (LC4) 4 3.8 (LD5) A |
3.08 | 2AC | 2BC | GU4 |
| MX2/350C | 3.8 (LD5) A | 3.23 | 2AD | 2BD | GU5 |
| MW9/200-4R | 4.1 (LC4) 4 | 3.42 | GTE | GTP | GU6 |
| 3.8 Turbo (LM9) 9 | w/ 8.5" Ring Gear | ||||
| MW9/200-4R | 3.8 Turbo (LM9) 9 | 3.42 | GTE | GTP | GU6 |
| w/ 8.5" & Alum Brake drums | |||||
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.29 | 7.5" | 2AH, 2BH |
| 2.41 | 7.5" | 2AJ, 2BJ |
| 2.73 | 7.5" | 2AB, 2BB |
| 3.08 | 7.5" | 2AC, 2BC |
| 3.23 | 7.5" | 2AD, 2BD |
| 3.42 | 8.5" | GTE, GTP, GTJ |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | RPO Code |
| 200C 200R |
3.8 (LD5) A 5.0 (LV2) Y |
2.41 | 8AJ | 8BJ | GU1 |
| 200C | 3.8 (LD5) A | 3.08 | 8AC | 8BC | GU4 |
| 3.23 | 8AD | 8BD | GU5 | ||
| 200-4R | 3.8 Turbo(LM9) 9 | 3.42 | 8TJ | 8TP | GU6 |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.29 | 7.5" | 8AH, 8BH |
| 2.41 | 7.5" | 8AJ, 8BJ |
| 2.73 | 7.5" | 8AB, 8BB |
| 3.08 | 7.5" | 8AC, 8BC |
| 3.23 | 7.5" | 8AD, 8BD |
| 3.42 | 8.5" | GTP, GTJ |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | RPO Code |
| 200C | 5.0 (LV2) Y | 2.14 | 2AK | 3BK | G72 |
| 200C | 3.8 (LD5) A | 2.41 | 2AJ | 2BJ | GU1 |
| 200-4R 200C |
5.0 (LV2) Y | 2.56 | 2AA | 2BA | GM8 |
| 200-4R | 5.0 (LV2) Y | 3.08 | 2AC | 2BC | GU4 |
| 200C | 3.8 (LD5) A | 3.08 | 2AC | 2BC | GU4 |
| 200C | 3.8 (LD5) A | 3.23 | 2AD | 2BD | GU5 |
| 200-4R | 3.8 Turbo(LC2) 7 | 3.42 | 2TJ | 2TP | GU6 |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.14 | 7.5" | 2AK, 2BK |
| 2.41 | 7.5" | 2AJ, 2BJ |
| 2.73 | 7.5" | 2AB, 2BB |
| 3.08 | 7.5" | 2AC |
| 3.23 | 7.5" | 2AD, 2BD |
| 3.42 | 8.5" | 2TP, 2TJ |
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| Trans | Engine | Ratio | Peg Leg | Ltd Slip | RPO Code |
| 200C | 5.0 (LV2) Y | 2.14 | 2AK | 3BK | G72 |
| 200C | 3.8 (LD5) A | 2.41 | 2AJ | 2BJ | GU1 |
| 200-4R 200C |
5.0 (LV2) Y | 2.56 | 2AA | 2BA | GM8 |
| 200C | 3.8 (LD5) A | 2.73 | 2AB | 2BB | GU2 |
| 200-4R 200C |
5.0 (LV2) Y 3.8 (LD5) A |
3.08 | 2AC | 2BC | GU4 |
| 200C | 3.8 (LD5) A | 3.23 | 2AD | 2BD | GU5 |
| 200-4R | 3.8 Turbo(LC2) 7 | 3.42 | 3TJ | 3TP | GU6 |
| Gear Ratio |
Ring Gear |
Assembly Codes |
| 2.29 | 7.5" | 2BH, 2AH |
| 2.41 | 7.5" | 2AJ, 2BJ, 2BZ, 2AZ |
| 2.73 | 7.5" | 2AB, 2BB, 2AX, 2BX |
| 3.08 | 7.5" | 2AC, 2AV, 2BC, 2BV |
| 3.23 | 7.5" | 2AD, 2BD |
| 3.73 | 7.625" | 2TF, 2TH |
| 3.42 | 8.5" | 3TP, 3TJ |
| 3.73 | 8.5" | 3TE, 3TX |
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