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  #1  
Old 04-08-2015, 10:53 PM
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Torque converter? Tranny?

I have a 2007 grand Cherokee Laredo (3.7) with 107,000 miles. While driving the jeep jerks, shudders or feels like you are going over a bump. It is shifting at weird times & sometimes won't downshift without me manually doing it. I've had a complete tuneup. I just had the Transmission Control Module replaced due to the code U0404 (invalid data received from gear shift control module). This is the only code that is stored. Picked it up today & didn't even make it a block before it did it again. Turned around picked up service manager & different mechanic and drove them so they could feel it. No code was thrown. I've had it in 4 times since 3/16.... Any suggestions? Allthrmechanics are sure that it isn't the tranny.... I'm frustrated & broke, please help....


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  #2  
Old 04-09-2015, 11:20 AM
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Re: Torque converter? Tranny?

Did the stealer inform why they changed the TCM and didnt do anything to the shifter assy itself? Many times cleaning the shifter assy will solve the U0404 problem.
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Old 04-09-2015, 03:14 PM
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Re: Torque converter? Tranny?

No they did not.... I will ask them. Anything else I should have them check? I don't want to pay for a torque converter if I don't have to....


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Old 04-09-2015, 09:09 PM
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Re: Torque converter? Tranny?

I presume, since it went to the stealer, that they checked the transmission fluid level and color/smell?
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Old 04-09-2015, 09:24 PM
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Re: Torque converter? Tranny?

I would certainly hope so.... I will ask them tomorrow. Very frustrated....


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Old 04-15-2015, 08:10 PM
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Re: Torque converter? Tranny?

Ok now they say it's my valve body & torque converter. They are recommending that I put a used tranny in it because it will be cheaper. They are comping me the $600 for the TCM which they replaced but say was bad.... So $1841 for the used tranny.... They said the tranny fluid was burnt although it wasn't bad when I had a tuneup before they replaced the TCM.... Does this sound right?


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Old 04-15-2015, 09:41 PM
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Re: Torque converter? Tranny?

When the tuneup was done, was the transmission fluid changed as well? If so, how many miles did you drive after the change?How did they discover that the problem is in the valve body, or is it just a guess? Was there any fault code set? $1840 for the used tranny, is that with installation and torque converter?
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Old 04-15-2015, 10:28 PM
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Re: Torque converter? Tranny?

They said the tranny fluid was changed - although I suspect it wasn't.... If it was I only drove 100 miles or less.... I drove them around after the TCM was replaced because it was still doing exactly the same thing - downshifting frequently & then sometimes not upshifting.... They said they drove it a lot & tested it & they found valve body issues and that the torque converter was locked up. The only code that has shown up was u040 & that was why they replaced the TCM. It is only costing me $1841 because they aren't charging me diagnostic fees and are eating the $600 that I already put in it for the TCM... And yes it is for the tranny & torque converter. They said it would be cheaper just to replace the tranny than for them to figure out & replace whatever is wrong with the valve body.... My question is - it is obviously somehow tranny related but how do I know if this will fix it & how do I know that the used transmission is good? I'm assuming it is a rebuilt tranny - should it have any warranty? So very frustrated!



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Old 04-15-2015, 11:24 PM
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Re: Torque converter? Tranny?

If you know of a reputable transmission shop in your area, you could get a second opinion from them. If the transmission fluid was burned, then one or more clutches where slipping. (eventually torque converter clutch). If a clutch had slippd long enough, the friction material can be reduced a lot or even the friction material has burned. So this situation would require a rebuild with all new clutches and seals and a new torque converter. If there was a fault in the valve body, then ofcourse this must be solved as well. You could look around and see if you can find a low milage NAG1 transmission for a good price and see what a reputable shop would charge to install it for you.
Regarding the transmission your stealer wants to sell to you, i presume that they will give you a certain warranty on it. You will have to ask the stealer for that. I donīt know your stealer, but many times they are just too easy to say that you need a rebuild or used transmission. For that reason i would try to get a second opinion on it first.
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Old 04-29-2015, 02:40 PM
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Re: Torque converter? Tranny?

2007 grand Cherokee Laredo 3.7L with 107,000 miles still surging/downshifting after complete tuneup, replaced TCM, and rebuilt tranny... $3300 later and still doing it.... Suggestions?


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Old 04-29-2015, 11:07 PM
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Re: Torque converter? Tranny?

Quote:
Originally Posted by mbartels View Post
2007 grand Cherokee Laredo 3.7L with 107,000 miles still surging/downshifting after complete tuneup, replaced TCM, and rebuilt tranny... $3300 later and still doing it.... Suggestions?
Didnīt they quote you $ 1840 for the job?
The U0404 code didnīt come back after they changed the TCM?
Previously it didnīt want to downshift automatically, but now it downshifts at wrong points?
Did the stealer check the engine, if that is not the one causing the surging? A bad TPS could cause surging and also shifting at wrong times.
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Old 04-30-2015, 06:18 AM
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Re: Torque converter? Tranny?

I will ask about TPS. I took it from dealer to a tranny shop because I didn't want to pay 1840 for a salvage yard tranny....


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