Ralley II Wheel Code
Short answer: For a 1968 Firebird with disc brakes, the correct Rally II wheel code is “JC” (the same as drum brakes) — per the 1968 Service Manual, 1968 Parts Book, broadcast sheet, and verified original cars. The widespread “JA for disc” claim is a technical error carried over from the 1967–68 GTO / 1967 Firebird.
A 1971 parts book says 1967 used JA (disc) and JC (drum), while 1968 used JC for all — yet all the 1967–68 disc parts were the same, so the reason for two 1967 codes is unclear. Remember the code is read at the valve stem, not inside the rim (the inside stamp can differ). Reference: Rich’s Pontiac Server, pontiacserver.com/wheels.html.
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Content last modified: June 13, 2026 at 10:06 am
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