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View Full Version : Caddilac tranny support?


Boost
April 27th, 2007, 06:13 AM
Can I tune tranny in a 2000 STS? I think it's a 4T60 or something. I know the Northstar isn't supported, but maybe the tranny?
Boost
April 27th, 2007, 10:11 PM
That year STS does not have a separate TCM. Tranny is controlled through the engine computer. I was somewhat hopeful, since there IS support for the tranny in that Caddy, but in other applications such as the Buick only. However, I found a trick way to adjust the speedo for different gears anyway...;)
N0DIH
October 29th, 2007, 04:46 PM
Look up AJxtcman, tell him I sent you. He can help.....

http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/105315-northstar-tuning.html
Boost
October 31st, 2007, 12:56 PM
Thanks, it was just for a co-worker that installed a junkyard tranny in his Caddy with slightly different gearing. I wanted to make corrections for him. Probably not going to follow up on that particular issue, but if anything comes up, I'll contact your friend. I appreciate the info.
N0DIH
October 31st, 2007, 03:13 PM
The 4T80E has 2 gearing ratios that I am aware of.

3.15 for the 275hp N* (at least up to 2000 or so)
3.71 for the 300hp N* (at least up to 2000 or so)

Not sure on the newer ones....
GMPX
November 12th, 2007, 10:44 PM
The earlier Northstar ECM's and TCM's were pretty odd, Siemens stuff.

Cheers,
Ross
N0DIH
November 24th, 2007, 02:45 PM
IIRC, dual processors and dual checksums is what makes the real headache....
GMPX
November 24th, 2007, 04:09 PM
Yep, that's the one!!

Cheers,
Ross