Caddilac tranny support?

[Boost]

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]

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]

Look up AJxtcman, tell him I sent you. He can help.....

http://www.cadillacforums.com/forums...ar-tuning.html

[Boost]

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]

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]

The earlier Northstar ECM's and TCM's were pretty odd, Siemens stuff.

Cheers,
Ross

[N0DIH]

IIRC, dual processors and dual checksums is what makes the real headache....

[GMPX]

Yep, that's the one!!

Cheers,
Ross