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Old 10-26-2018, 09:43 PM
keith k's Avatar
keith k keith k is offline
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Join Date: Feb 2005
Location: SE Michigan
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Quote:
Originally Posted by 72projectbird View Post
What would the Axle Performance option be? I thought the rear axle tube said COX, which would be a 3.55, but maybe it said COZ which is a 3.73?

I need to look at it again.
Is the trans an M20, or M21?

The transmission was a "free" selection (M20 wide ratio, M21 close ratio, or TH400 auto). But if the M21 was picked, the 3.73 ("performance axle") and heavy duty radiator were mandatory inclusions.

My guess is original buyer or dealer that ordered it simply checked the M21 box, and the 3.73 and HD Rad were automatically added to the invoice.

Yes, the axle tube should be stamped COZ.

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keith k
70 Trans Am RA III / T400 / Lucerne Blue / Bright Blue
70 Trans Am RA III / M20 / Lucerne Blue / Sandalwood
70 Formula RA III / M21 / Lucerne Blue / Bright Blue