Reving up when in gear driving - 2004 Jeep Grand Cherokee

Sounds like your one of your shift solenoids is bad are you driving and it starts reving up at random?

I would guess that something inside of the transmission has failed and there is no longer a mechanical connection between the motor and the drive axles regardless of what gear you attempt to move in.[sheared splines, broken planetary, etc.] Often when this happens you won't hear any kind of noise because of the failed parts being inside the transmission case...instead the car just won't go anymore. You could have a CV drive axle joint that has failed but generally they will make some noticable rattling or grinding noise as they churn away when you try to go forward or reverse. If something has failed inside of the transmission then the transmission will need to be removed and repaired. It if is just a drive axle joint that has failed then that can be replaced without doing anything to the transmission. Hope this helps and good luck!

Hi, my car does not change gear during driving. I am told the transmission is stuck in 3rd gear. Even when taking off from a complete stop, I have to rev the engine before the car moves. Sometimes after a long drive the engine would switch off and only start after a 10 minute break. What could be the problem?

Tell your mechanic to check for damage radiator trans cooler, sometimes the coil cracks allowing transmission fluid mix with coolant, and coolant with transmission fluid creating lots of present and future problems.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/flavio_517b938f50183b92

the car will try to drive as economically as possible,so will try to run in the highest gear for a given road speed,in town driving,it is more comfortable if the o/d is OFF.but for cruising at,say,45mph,with a light throttle then o/d should be ON.

It needs rebuilding. The upper gear(s) are not locking in, so your likely wearing out your clutch when you drive fast. Get it rebuilt.

Check your tranny fluid levels- if they are low your transmition will slip between gears, however if you notice any kind of free reving while its shifting (like being reved up when in park or neutral) then the hydrostatic clutches are slipping and the transmition needs repair.

Another thing you should investigate is your transmition kick down bar (it shifts the trany into a lower gear when accelerating hard to help pick up speed.

Sounds like a bad pump or converter. You need to check line pressure.

Sounds like you might have lost the tranny,or at least the shift solinoids inside the tranny.

when it won't move can you reve the engine? and if so does it try to engage into any gears at all?