Quote:
Originally Posted by johnw1944
I have a 2004 chevy Tahoe 4x4. I need to know what should the RPMS be at 70 Mph. My Tahoe tacks 2300 Rpms at 70. Is this correct or is my overdrive not working>
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my 2000 silverado 4x4 3.73 rear diff RPM is about 2K..@70MPH.. 2300 is too high IMO..... I think your running in 3rd . when I tow my 4K LBS boat I run in 3rd @ 2300 RPM @ 70 MPH ... normally I tow @65 MPH.. with the 4 speed tranny my vehicle shifts into 4th at 35-38 MPH.... my 96 impala shifts also at 38 MPH... 2004 GM used DEXRON III this fluid is no longer an approved GM fluid because it put GM into bankruptcy . If you never changed to the GM approved dexron VI then it is very possible the valve bodies are eaten away from the dexron III fluid turning to an acid metal eating mess. DEXRON III is only good in a tranny for 20K miles then the acid begins .. gm dumped this fluid in 2006 !