Cadillac STS The newest installation of the performance sedan from Cadillac, having replaced the Seville

Transmission Replacement

Old 01-03-2007, 12:43 AM
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Join Date: Jan 2007
Posts: 2
Default Transmission Replacement

I'm going to be replacingthe transmission in my '94 STS. Appears that it is a 4T80E transmission. Any reason a 4T80E transmission from any other year Seville or other Cadillac which has a 4T80E will not fit and work?
Old 01-03-2007, 07:15 PM
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Join Date: Jun 2006
Posts: 507
Default RE: Transmission Replacement

Check with the dealer or bone yard for which years and modleswill interchange.
A 2005 4t80e will not work properly with a 94 sts PCM.
The biggest difference i know of is the TCC changed around 2000.
There will be other changes through the years so you need to do your homework before you make the swap.
Old 01-05-2007, 11:49 AM
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Join Date: Jan 2007
Posts: 2
Default RE: Transmission Replacement

Thanks for the response. I have found out that the 94 STS 4T80E was a one year one year only STS tranny. Different wiring harness and various other items. Going to rebuild the one I have.
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