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If it really is an 89 model, and it really came stock with a 454, then it *will have* a TH400 factory. If someone swapped in some different tranny, it could be who knows what.

As mentioned, google up some pan images and compare them to it.
 

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Discussion Starter · #10 ·
The google search worked. Its a 4L80E. After breaking the motor down, it is obvious it has been rebuilt once aleady. The 4L80E probably went in with the rebuild. Thanks for all the help.
 
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