over time it seems to take more and more RPM to maintain the same speed. i thougt it was just my engine going(i had very bad compretion). Now that i have totaly rebuilt the engine and I am making more power it still seem to take the same RPM to keep highway speeds.

Is there something slipping in my trany. and if so what mite it be?

 

I would bet on it being the tach. I just did the engine swap/tranny rebuild and my RPM's still read about 500-600 high. I can tell by the sound of the car that I'm turning 1500 RPM at 50 mph but the tach says 2k.

~M~

 

Yea, I agree... A lot of times a slipping auto, is alot like a slipping clutch. The RPM's rise up, and than start to grab bringing the rpm's back down. At it's worse you need to rev it up to 2000+ rpms just to get slowly moving from a light. The trannie only has about an hour left at that state of decay.

Ron