The Formula's have a different context in their invoicing and we can't really use them as examples working towards a grey area on these TA's that are - or might have been - 3.73 axle cars.
But about the Formula's that is noteworthy, was how almost half and half of the 4spd 3.73 axle gear cars were split between M20 and M21.
The TA's may have followed close to that same "take rate".
My opinion - which isn't at all true on the TA - the 3.73 upgrade should have been the same charge/option code as the GTO when they went from 3.55 to 3.90 or 4.33
Axle-Special Order for $2.11
The $10.53 upgrade charge on the TA axle is exorbitant.
It may be like Keith mentioned as one possibility - that the M20 3.73 combo got the $10.53 charge, and the M21 3.73 combo did not.
I think that could be the root factor.
idunno
But would be cool to figure it all out with brass tacks nailed along the edges.
The 03C car that 72projectbird has - would be good to know the invoice date and see where it falls in with the 3/31 and 4/10 invoices.
I have never checked to see whether my Ram3 4spd 3.73 TA has M20 or M21.
That one has been mothballed for over 30 years now.
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