Re: Is this a TH400 or 4L80??
Unlikely you will find the long foot 71-85 GM TH400 to NP205 adapter. Advanced Adapters has a reproduction that sells for $270.
Yours works fine. The difference between the usage is in the cross-member.
The short foot, that you have, typically have an asking price of around $400. Unsure if they actually sell many for that price or not?
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