It needs a L67 or L32 complete swap, find a rear end totalled GTP and drop the whole cradle and pull the harness and pcm and just put it in and done... supa fast sneaka sucka
Is it not easier to drop in the 3.4? I just know that on j-bodys a 3.1 to 3.4 swap is a one weekend job for an inexperienced person.
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2005 GPGT- Top Swapped Click me!15.5 @109
2002 GPGT- slow and stock
1993 Oldmobile 88- exploded the diff @158k GPF Resident Flowmaster Troll