Originally Posted by eric5324

Hey guys, my 5r55e with about 95,000 miles on it is slipping while in overdrive only at highway speeds. It shifts fine below 50 and with overdrive off. It's the worst when on highway around 65-70 but not as bad if i get the rpm's up going above 75. It will do it with overdrive off going 65 too so not just overdrive. running two quarts of lucas now. Sounds like it's not a valve body problem due to it happening at higher speeds. Just wondering what yall thought. thanks.