I'm new to this site. I just bought my second jeep. My first was a 2000 cherokee limited 4.0L automatic. Drove it for 250,000 miles until a deer ended it's career. A great jeep.
My newer jeep,2004 Grand cherokee limited 4.7L automatic with 99,000miles, has been downshifting at round 55-70mph under almost any condition. The O/D is "on". I get a rpm increase of about 250 then upshifts back. It does this 5-10/minute but it's random. If I drive under 50mph or over 70 this doesn't happen as often. Could this be the throttle position sensor? Some kind of O/D lock/unlock condition or other etc?
Can you guys give me a few ideas if what this maybe.
3/5/12 Update: I changed the throttle position sensor and have been driving it around for the last 2 days under all of the above said conditions and no shifting out of, and back into O/D. Case closed!!!