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Old 02-11-2016, 12:43 PM
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42re is stuck in first

hello guys and gals im new here. great to meet you all. here is my situation: i purchased a 2001 GC a month ago with a blown transmission. the jeep has 201K on it and the transmission i installed to replace the old one has 130K on it.

the mechanic installed the tranny with 130K and drove it to my home which is 30 miles from his shop and the tranny did great. the jeep sit for 3 weeks until i could get it registered which was this past friday and when i go to drive it after registration the jeep will not shift out of first. after driving around the back streets in town at a very slow speed for 15 -20 minutes it begins shifting fine and i drive it another 20- 25 miles.

the next day i go out thinking everything is going to be fine now that it did so well at the end of the drive the day before but no it is the same as it was the previous morning. so now i have been trying and trying to get it to shift again like it did that day by driving it until it is really warm im guessing but its not working but i have figured one thing out. it will change into the next gear if you run the rpms up to 3500 or 4000 rpms but thats not good and should not have to be done to accomplish gear change. i forgot to mention the mechanic did a filter and fluid change on it after he installed it.

i have replaced the output speed sensor and checked the throttle kick-down cable. checked all the connections on the tranny underneath the jeep and everything looks fine. the fluid is correct. if anyone has experienced this or has any idea what could be going on your help would be greatly appreciated. thank you advance

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  #2  
Old 02-11-2016, 06:24 PM
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Re: 42re is stuck in first

Welcome to the garage.
Did you check if there is any fault code stored in the PCM?
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Old 02-11-2016, 06:25 PM
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Re: 42re is stuck in first

i did and there are no codes.
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Old 02-11-2016, 06:35 PM
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Re: 42re is stuck in first

Does reverse work ok?
You did check the rigging of the throttle cable and the gear shift cable, right?
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Old 02-11-2016, 06:57 PM
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Re: 42re is stuck in first

Reverse does great and so does first. No slipping. I have checked all the linkages and all look fine
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Old 02-11-2016, 07:34 PM
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Re: 42re is stuck in first

What was the problem with the original transmission?
Do you know the history of the new(er) transmission you have in your jeep now?
The problem could be with the adjustment of the front band.
You said that it would upshift at high rpm. Is that only from 1st to 2nd, or also the other upshifts?
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Old 02-11-2016, 08:41 PM
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Re: 42re is stuck in first

Someone had tightened one of the solenoid on the original transmission so tight it busted the housing and was leaking fluid profusely so I figured it was cheaper to buy another transmission than to repair that one even though it changed great.

I don't know the history of the one that's in it now but it was very clean and had very clean fluid in it.

It will up shift from first to second and I haven't tried third because I didn't wanna rev it anymore than I have to
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Old 02-11-2016, 10:25 PM
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Re: 42re is stuck in first

And when you shift it from manual 1st to 2nd? It still would be good to know if the shifting problem is only from 1st to 2nd, or all upshifts. It could narrow down the possibilities.
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Old 02-11-2016, 10:58 PM
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Re: 42re is stuck in first

it does nothing when shifting manually... it stays in first gear... let me clarify that it will shift from first to second only if you run the rpms up to 3500 or 4000 and i dont like doing that...
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Old 02-12-2016, 06:53 AM
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Re: 42re is stuck in first

Not that familiar with the 42RE, but the shifting for the lower gears is done with shift valves inside the valve body. Throttle pressure and line pressure are both important inputs which determine the shift points. You are absolutely sure that the throttle valve cable is adjusted properly? Attached the procedure to check the adjustment.
Do you know if this transmission was working fine before you got it?
Attached Files
File Type: pdf Throttle valve cable adjustment.pdf (167.6 KB, 1 views)
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Old 02-12-2016, 09:22 AM
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Re: 42re is stuck in first

after the installation the mechanic drove it to my house which is a 30 mile trip and it did fine. it sat for 3 weeks and i went to drive it after it had been sitting and it would not change gears. the throttle valve cable is where it was when he drove it here...
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Old 02-12-2016, 09:33 AM
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Re: 42re is stuck in first

section of the diag chart from another RE FSM
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File Type: jpg re.jpg (146.2 KB, 8 views)
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