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  #13  
Old 10-09-2011, 02:59 PM
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Re: Possible speed sensor or transmission issue.

How do I know if I have 1 speed sensor or 2 on my vehicle?
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  #14  
Old 10-09-2011, 03:00 PM
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Re: Possible speed sensor or transmission issue.

A sudden too high fluid level sounds strange. Did you check it in the right way, with engine running? (don't know the exact procedure for the 42RE) A too high fluid level can cause foaming of the fluid and subsequent lower pressures in the system, causing clutch slip. If the level really is too high, isn't there any cooling liquid mixed?
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Old 10-09-2011, 03:02 PM
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Re: Possible speed sensor or transmission issue.

The 4.0 I6 uses the 42RE tranny, which only has the output shaft speed sensor. There are 2 speed sensors on the 5-45RFE, which is normally only used on the 4.7.
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Old 10-09-2011, 03:04 PM
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Re: Possible speed sensor or transmission issue.

Yes I checked it with the engine running and someone made mention that their were bubbles in it, the fluid looks fine and smells fine. I dont know if there is cooling in the mix.
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Old 10-09-2011, 03:05 PM
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Re: Possible speed sensor or transmission issue.

Frango which transmission do I have?
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Old 10-09-2011, 03:21 PM
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Re: Possible speed sensor or transmission issue.

My neighbor just checked the fluid for me, I didnt know I was supposed to check it with the car in neutral, he said I should add a half of a quart and see what happens.
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Old 10-09-2011, 03:29 PM
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Re: Possible speed sensor or transmission issue.

As Frango100 mentioned "The 4.0 I6 uses the 42RE tranny, which only has the output shaft speed sensor. There are 2 speed sensors on the 5-45RFE, which is normally only used on the 4.7."

You most likely have a 42RE if you're running a 4.0 I6
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Old 10-09-2011, 04:15 PM
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Re: Possible speed sensor or transmission issue.

Thanks guys, I REALLY appreciate all of the help
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  #21  
Old 10-09-2011, 04:17 PM
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Re: Possible speed sensor or transmission issue.

You should have the 42RE, which is normally coupled to the I6.
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Old 10-09-2011, 04:29 PM
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Re: Possible speed sensor or transmission issue.

Do you know when for the last time the tranny fluid and filter where changed? According the severe use schedule, you should change it every 30.000 Miles. I think that eventhough you wouldn't be using it according the severe schedule, that the 30.000 Miles still would be a good distance to change the fluid. Just an insurance that you always have the proper clean fluid for perfect lubrication, heat transfer and hydraulic properties. I was just reading about how the fluid is degrading more quickly when the fluid temperatures are getting higher. So when you live in a hot climate, you should for sure stick with the 30.000 Miles change interval.
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  #23  
Old 10-09-2011, 05:23 PM
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Re: Possible speed sensor or transmission issue.

I know I had never done it before, I think my friend may have because when my neighbor checked the fluid he said it looked perfect and smelled fine, nothing burned or off at all. I will def look into it.
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Old 10-13-2011, 07:45 PM
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Re: Possible speed sensor or transmission issue.

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.
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