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No 4L80e until 1991, so you are either confused about the year of the truck, or it has been swapped in.
 

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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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