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  #25  
Old 10-14-2011, 05:37 AM
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Re: Possible speed sensor or transmission issue.

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Originally Posted by paidduz View Post
Sounds like you got a lot of good advice already. New to site because I came upon this very page when I typed in my same issues with my 2004 Grand Cherokee 4.7 yesterday.
Thanks for the input and welcome to Jeep Garage
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Old 10-16-2011, 12:28 AM
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Re: Possible speed sensor or transmission issue.

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Originally Posted by paidduz View Post
Sounds like you got a lot of good advice already. New to site because I came upon this very page when I typed in my same issues with my 2004 Grand Cherokee 4.7 yesterday. I investigated the speed sensor issue on line and asked a few engineers that I work because the one worked at Chrysler on this trans. He wasn't as formative as the other engineer that worked for Eaton. He told me that there is no doubt that it is the speed sensor, when he worked for Eaton they were trying to design a new one for Chrysler. They refused to recall the vehicle and decided to fix the issue as the customer comes in with the problem. Well I won't bore you with the details of why its the sensors. But I took his advice and my jeep is perfect. The cost of the speed sensor at Autozone was around $20 for each. The trans fluid look like tomato soup with milk in it. So we decided to drain that and change both filters as well. Jeep was lunging forward for a while...didn't think much of it, as it's up there with the mileage 160K. Until after being in traffic...I went to take off with the rpms going up to 3,000 and with no movement from the vehicle. It eventually did go into gear then I managed to make it to my work with only 3 miles after it started. And from there we had it towed home. After the sensors were installed we test drove it and I was in freak'n shock. It's like it glides when it goes into gear. I feel stupid not looking into this earlier I love my jeep. It's been very good to me I drive a lot a miles everyday to work, and these Michigan winters can be a &itch to drive in. Good luck to you there easy to change...you may even find a You Tube video showing you how to do it. I read on another site the stealerships are charging over $300...$100 of that to put the code reader on it. Oh forgot to mention...NO CHECK ENG LIGHT CAME ON, and NO CODES.

Thank you so much, sounds like my problem but less extreme. Tons of clunking/ rough up and down shifts. I think I'm going to order a speed in and out sensor
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Old 10-16-2011, 09:00 AM
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Re: Possible speed sensor or transmission issue.

I currently have a 99 GC with a 4.7L that has a bad output sensor, and I bought another 99 GC with a 4.0L earlier this year with a bad input/output sensor earlier this year. I bought it as-is for $600 so didn't know much about it's history. The 4.0 had a bad input/output sensor and would not shift out of 1st gear. I could redline it in 1st and until I swapped the sensor out it wouldn't shift into 2nd. I also got a MIL for the sensor in both the 4.0 and the 4.7. I cleared the light and it came back on right away as soon as it missed the 2nd gear shift. Once I swapped out the sensor I still had transmission issues kinda similar to what you're talking about. Mine would thunk into drive and reverse and the idle would surge and then drop low. It seemed to shift fine on the highways, it didn't jerk into gear when shifting but the shift points were off. It wouldn't shift until around 3k rpm's or so. After the car was warmed up it would feel like it was going to bog out at red lights unless I threw it into N. It ended up being the torque converter inside the tranny was going. There was a leak in the trans cooler line and the previous owner had run it low on fluid for too long. I also had a different car (not a jeep) that had a really bad torque converter and it did the exact same thing you're talking about. It wouldn't move from a stop for a few seconds after hitting the gas, then it would finally catch. When it upshifted it was usually fine, sometimes the shift was hard but most of the time it was ok. When slowing down it would downshift partially into the lower gear then a second later it would finish the downshift and finally drop into the lower gear. If the downshift normally took it from 2800rpm down to 2k rpm, mine would go from 2800 to 2500 then a split second later it would finally drop down to the 2k. That was a bad lockup solenoid in the torque converter. The lockup solenoid was not working correctly so it was always like it was double downshifting. When it did the second part of the downshift it felt like it lunged forward into the lower gear. I hope your issue is a cheaper and easier one than that, but just wanted to let you know so you can have that looked at in case the sensor doesn't help.
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