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Old 10-29-2022, 02:28 PM   #6
Accelo
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Join Date: Mar 2015
Location: washington
Posts: 2,177
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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