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Unread 09-26-2008, 08:45 AM   #1
2tone93zj
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1993 ZJ 
 
Join Date: Dec 2004
Posts: 587
transmission: late shift 1-2 and downshifting problem

hey i have a 93 GC with the 4L and 42RE. Yesterday i noticed that from first to second gear it doesnt shift where it used to (2000 rpm) it now shifts at approx 2800 or higher. if i let off the gas at approx 2300 it will upshift. Also when cruising in OD if i hammer the gas it will downshift and RPMs soar up and speed does not increase.

Fluid and filter is approx 1 year old and is ATF4. Fluid is still bright red and does not smell burnt. Today i tried a bottle of lucas and didnt change a thing.

what to do next?

thanks

ps i searched but didnt come up with much, answers seem to change quite a bit.

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1993 Jeep Grand Cherokee Laredo
I-6, 42re, 249-->242 selec-trac swap, D30/D35
31x10.5, 3.5" IRO F>R, skids and tow hooks

Wanted: 93-95 Keyless entry fob

BUILT NOT BOUGHT #204
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Unread 09-26-2008, 08:50 AM   #2
speedbird1229
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Could be the kickdown cable misaligned. That cable tells the transmission whether it should change at higher or lower RPMs.
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Unread 09-26-2008, 11:12 AM   #3
Coletrickle
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Definitely check your 'kick-down' cable. Mine was acting a lot like what you describe and it was just a worn out spring. I added a stiffer spring and it's been flawless ever since. The cable runs from the throttle body down to the tranny on the linkage side. It's just above the shift linkage. Check it for free movement, make sure the spring returns it all the way, and if those are good, try adjusting it.
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Unread 09-26-2008, 11:28 AM   #4
2tone93zj
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Quote:
Originally Posted by Coletrickle View Post
Definitely check your 'kick-down' cable. Mine was acting a lot like what you describe and it was just a worn out spring. I added a stiffer spring and it's been flawless ever since. The cable runs from the throttle body down to the tranny on the linkage side. It's just above the shift linkage. Check it for free movement, make sure the spring returns it all the way, and if those are good, try adjusting it.
how do i check it? i can check it for slop, and put a stiffer spring in. but how do i go about adjusting it? any info on this?

thanks
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1993 Jeep Grand Cherokee Laredo
I-6, 42re, 249-->242 selec-trac swap, D30/D35
31x10.5, 3.5" IRO F>R, skids and tow hooks

Wanted: 93-95 Keyless entry fob

BUILT NOT BOUGHT #204
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Unread 09-26-2008, 12:14 PM   #5
Coletrickle
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It's probably seized or the spring. Try that first.

There is adjustment on the cable right at the linkage to the tranny. I didn't have to adjust mine so I didn't research it, sorry. But I talked to another forum member who had to have his cable adjusted, unfortunately a tech at a tranny shop did it for him.

From what I have learned, it works something like this...if you apply more throttle, the cable pulls a lever on the tranny which raises the shift points. Less throttle, the cable is pulled back by the spring and this lowers the shift points.

In your case it sounds like the cable it just not being pulled back by the spring, so the shift points stay high even with light throttle and that's why you need so much RPM to get it to shift. This could also happen if the cable were too short, and not allowing the lever on the tranny to return all the way...but I've never heard of a cable shrinking. I would think the adjustment would be more suited for stretched cables that would make for quick shifting, low rpm and a tranny that wouldn't kick down when you stomp on it.

This is just educated guessing. Hope it helps.
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231/skids/33" KM2's
Homegrown Bumper
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Unread 09-26-2008, 12:46 PM   #6
2tone93zj
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the transmission is downshifting, once its down shifted rpms just fly up and no speed is increased would this still be a kick down cable adjustment? also i just tried to "manually" shift (1-2-D)
I tried:

start in first gear and go into second= no shifting occured
start in second gear and into D= late shifting occuring
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1993 Jeep Grand Cherokee Laredo
I-6, 42re, 249-->242 selec-trac swap, D30/D35
31x10.5, 3.5" IRO F>R, skids and tow hooks

Wanted: 93-95 Keyless entry fob

BUILT NOT BOUGHT #204

Last edited by 2tone93zj; 09-26-2008 at 01:00 PM..
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Unread 09-29-2008, 05:21 AM   #7
Coletrickle
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I don't know, did you get under it and check the cable? It'll take 5 minutes. Have someone apply the throttle for you and see if it backs off all the way when you lift the throttle.

Start there...if it's working fine try a new idea.
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5.5" Hybrid Lift/BDS CA's
231/skids/33" KM2's
Homegrown Bumper
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Unread 11-24-2008, 12:43 PM   #8
2tone93zj
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bringing up a old thread havent had alot of time to look at it, but i disconnected the kickdown cable at the TB and the delayed shift stopped, shifts great, but now to downshift. what does this mean?

thanks
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1993 Jeep Grand Cherokee Laredo
I-6, 42re, 249-->242 selec-trac swap, D30/D35
31x10.5, 3.5" IRO F>R, skids and tow hooks

Wanted: 93-95 Keyless entry fob

BUILT NOT BOUGHT #204
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Unread 11-24-2008, 01:38 PM   #9
CaseyC
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1994 ZJ 
 
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I just adjusted the cable on my 94 GC. It's called the throttle valve cable and apparently the adjustment is pretty critical (within 1 mm). I'll copy the instructions from the Haynes manual:
1. Verify that the lever on the throttle body is at its curb idle (closed) position and that the transmission throttle lever is also at idle (fully forward) position.
2. Remove the cable from the attachment stud on the throttle body lever.
3. Compare the position of the cable end to the attachment stud on the throttle body lever. The cable end and the attachment stud should be aligned (or centered on one another) to within .039 inch in either direction.
TO ADJUST:
1. Verify that the transmission throttle lever is also at idle (fully forward) position.
2. Depress the cable lock button to release the cable. The lock button only has to move about .070 inch to release the cable in the adjuster head. (The lock button is the flat spot right behind the bracket.)
3. Center the cable end on the attachment stud to within .039 inch and release the lock button.
4. Check the cable adjustment. Make sure the transmission throttle lever and the lever on the throttle body move simultaneously.
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Unread 03-20-2014, 04:03 PM   #10
mando69
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i have the same its a 4.0 auto trans if i try to shift in from 1st to second it acts like its in neutral put it in odrive has to get to 3000 rpm to shift took it to a shop they said second gear is gone any help guys and thanks
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