1999 GMC Yukon XL. 5.7 liter V8 check engine.
Just bought from used car lot. Replaced fluid and filter.

Question = when you take off in drive it takes off but then the engine revs and rpm are high but
the car isn't going very fast.


SF:
The e-mail address you left was incorrect so i could not contact you directly.
Sounds by your description that the transmission has lost 2 gear, at least. Several components   
internal to the transmission can cause this. It will most likely have to come out and be
disassembled.

The check engine light is probably going to have a
code p1870- transmission component
slipping. You  can go to any large national parts store chain, and they can scan it for free. You
never know,  you may have some other codes not related to the transmission and can give you
an idea if any other systems on this used truck are having problems.
2004 cavalier abs trac off and service vehicle light on
2001 trans has code P0753, no 1st gear, starts in 2nd. 1-2 shift solenoid
A few other Chevy questions.

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1999 GMC Engine Light And Revs High