overdrive slippage - JeepForum.com
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post #1 of 6 Old 07-23-2006, 12:42 PM Thread Starter
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overdrive slippage

I have an '02 grand cherokee. I am having shifting problems during normal highway driving conditions. The jeep will shift out of overdrive and downshift causing the jeep to jerk and increase the rpm's. This occurs on flat surfaces, going downhill and uphill. It only happens for a split second then shifts back into overdrive. It will do this repeatedly during long trips. When it shifts like this it will also kick off the cruise control. I have taken it to two dealerships they acknowledge the problem but have no idea what it could be; any suggestions?

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post #2 of 6 Old 07-23-2006, 01:06 PM
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So your saying you have overdrive engaged with cruise on and it will lock out OD which causes your tach to go up and this happens how often?

2000 WJ 4.0 @ 4.5" Rusty's 2.5 coils, Teraflex 2" spacers,
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post #3 of 6 Old 07-24-2006, 11:09 AM Thread Starter
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re overdrive slippage

Overdrive is engaged; however, the rev's will increase for a second like it is downshifting out of overdrive and if the cruise is on it will shut off. This happens on long highway trips and occurs atleast 5 times on an hour drive. It is like the jeep is sputtering on small grades and flat surfaces. Spark plugs were replaced and this still happened. The two dealerships gave the jeep back saying they did not know how to fix it.
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post #4 of 6 Old 07-26-2006, 09:34 AM
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Had a very similar problem with my 2000 ... also had the check engine light come on a couple of times...
Cleaning the throttle body cured it..
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post #5 of 6 Old 07-26-2006, 12:02 PM
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What is the increase in RPM when this happens and at what speed? Which engine and Tranny? Does this only happen with Cruise Control?

i.e with the 4oh and 42re: if rpm the increase is only ~250 then it's the lock-up torque converter. This can normally be resolved with ATF change, and ATF+4 works better than AFT+3 on this issue.
If rpms go from 2k to 3k on a level surface then the TV cable could be too tight.
If only during Cruies Cntrl then it's another issue, like vacuum leak.
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post #6 of 6 Old 07-26-2006, 12:32 PM Thread Starter
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overdrive slippage

Thanks for all the insight will look into all the possibilities. To answer a few questions the jeep is a regular straight six four liter with the four speed automatic with overdrive. This happens at speeds ranging from 62 m.p.h. to 72 m.p.h.
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