Rearend Decode 1967
Short answer: Per the 1967 Firebird supplement, the eight axle ratios are identified by a two-letter code stamped on the rear of the LH axle tube:
| Open | Ratio | Limited-Slip |
|---|---|---|
| XB | 2.56 | UN |
| XC | 2.78 | UP |
| XD | 2.93 | UR |
| XE | 3.08 | US |
| XF | 3.23 | UT |
| XG | 3.36 | UV |
| XH | 3.55 | UW |
| — | 3.90 | UX |
Note: there’s no “XL” Firebird axle code — the 4.33 ratio used “YL,” and only 13 1967 Firebirds got the 4.33 (none Ram Air). (“XL” was a ’65 GTO / Camaro code.)
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Content last modified: June 13, 2026 at 10:06 am
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