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Unread 09-26-2013, 03:26 PM   #1
blueribb
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1998 ZJ 
 
Join Date: May 2008
Location: Pennsylvania
Posts: 17
98 Grand Cherokee auto transmission problems

I have a couple automatic transmission issues that are starting to bother me. The first is gear 2 to 3 shifting for the first mile or so. It winds up to a much higher rpm before shifting. After about a mile, it's normal again. It's been doing this for years but is more noticeable now. The second issue may be the torque converter. This problem happens much less frequently but also seems to be happening more now than less year. When stopping at an intersection or traffic light, the engine rpm drops and almost stalls. It feels like a manual transmission without the clutch depressed. A few times it almost stalled out. My last transmission service (new fluid and filter) was about 6 yrs ago and last week they checked all fluids during an oil change and had to add a quart of trans fluid to reach the fill level. No difference was felt after they did this though.

1998 Jeep Grand Cherokee
4-speed automatic
6 cylinder
135,000 miles
2/4 wheel drive selectable

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Unread 09-26-2013, 03:46 PM   #2
newfieZJ
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1995 ZJ 
 
Join Date: May 2008
Location: , Alberta
Posts: 6,463
TC issue sounds like the lock-up solenoid is malfunctioning .

Shifting issue could be dirty filter , throttle linkage misadjusted , servo or clutch failure , band adjustment , or governor circuit fault
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Unread 09-27-2013, 09:12 PM   #3
blueribb
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1998 ZJ 
 
Join Date: May 2008
Location: Pennsylvania
Posts: 17
Thanks for the info. I'll be sure to have them try the filter change first. The other suggestions are all greek to me but I'll keep them on the list.
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Unread 09-28-2013, 08:14 AM   #4
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,487
Quote:
Originally Posted by blueribb View Post
gear 2 to 3 shifting for the first mile or so. It winds up to a much higher rpm before shifting. After about a mile, it's normal again. It's been doing this for years but is more noticeable now.
The longer shift when cold is by design. The PCM reads the thermistor in the gov pressure sensor and adjusts the shift pattern so that the tranny warms up faster.

Both symptoms could the indicate the fluid needs changing or any of the things newfie mentioned.

So my advise is to change the fluid and adjust shift cable. Check the materiel in the pan. Some powdered brass and clutch materiel are normal. Aluminum and big chunks are not. If the pan materiel looks normal, adjust the bands.
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Unread 09-28-2013, 12:08 PM   #5
dusterdude
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1996 ZJ 
 
Join Date: Jan 2012
Location: hopewell, va
Posts: 2,044
6 years?
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