3.90 or 4.33 - both got the M21
3.55 was standard gear, and the break point for M20
Only the Buildsheet will tell which was ordered.
Same charge on invoice for either set.
Automatics were the only ones that got speedo adapters - and the Invoice would show a charge for the adapter.
From examples, about 90-95% of D-Port cars with Spec Axle have been 3.90
But 4.33's were just as available , just not as often chosen.
HD Radiator was requisite either way.
Which plant was it built at ?
I'll try to post a similar plant sheet that is easy to read and maybe it "might" could help make a better observation of your sheet.
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