The pinion depth is designated by a 2-digit code for that 12-bolt ranging from 40 to 50. A 45 designates a specific depth (can't remember what it is, have it written down) and numbers below subtract 0.001" per increment and digits above add 0.001" per increment. It can be stamped into the tip of the yoke end. I just checked a 3.07 12-bolt pinion and it is written (grease paint?) on the face of the gear on the bearing side and is a "45".
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1967 Firechicken, 499", Edl heads, 262/ [email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule.
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