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Originally Posted by north

It's been many years but I seem to recall that while studying the MPC that only the GP could be had with forged axles which only came with 3.90 and up if I recall correctly.

Forged axles came in GTO/Lemans 8.2's as well.

I thought that the HD-STT meant 4 pinion, N-case, and forged axles, but never pulled my 3.55 HD STT rears apart to check. My 4.33 rear (1970) was forged. I have a 3.90 rear in my 68 'vert, but haven't pulled axles from it.

Scott