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Unread 07-05-2013, 11:28 PM   #1
Registered User
1998 ZJ 
Join Date: Jul 2013
Location: Arvada, Colorado
Posts: 3
Low speed first to second hunting

Alright guys I have tried as many words and phrases as I can think of in the search bar, but cannot find my symptom.

First, I have made sure my transmission is hot and in neutral, and yes it is full and in good condition. I have also adjusted my tv cable.

It happens at low speeds (under 10 mph or climbing hills), I will be just driving along and all of a sudden the transmission doesn't know if it should choose first or second. It feels like a buddy shaking you back and forth. the fluid is full and in very good condition.

This is my first jeep and I have been tuning the darn thing like crazy. I almost have it dialed in but this issue is really bugging me and I think it is an electrical due to it's meticulous maintenance history that is about two inches thick.

It only does it every now and then.

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Unread 07-06-2013, 07:59 AM   #2
Registered User
1997 ZJ 
Join Date: Dec 2008
Location: , Alabama
Posts: 8,046
HARSH 1-2, 2-3, 3-4 OR 3-2 SHIFTS - Lockup Solenoid Malfunction. Remove valve body and replace solenoid assembly.

1. Fluid Level Low/High. 1. Correct fluid level and check for leaks if low.
2. Fluid Filter Clogged. 2. Replace filter. If filter and fluid contained clutch material or metal particles, an overhaul may be necessary. Perform lube flow test.
3. Throttle Linkage Misadjusted. 3. Adjust linkage as described in service section.
4. Throttle Linkage Binding. 4. Check cable for binding. Check for return to closed throttle at transmission.
5. Gearshift Linkage/Cable Misadjusted. 5. Adjust linkage/cable as described in service section.
6. Clutch or Servo Failure. 6. Remove valve body and air test clutch, and band servo operation. Disassemble and repair transmission as needed.
7. Governor Circuit Electrical Fault. 7. Test using DRB and repair as required.
8. Front Band Misadjusted. 8. Adjust band.
9. Pump Suction Passage Leak. 9. Check for excessive foam on dipstick after normal driving. Check for loose pump bolts, defective gasket. Replace
pump assembly if needed.

This is the approach I would take, mostly because i hate spending money on a vehicle.

You may be on the right track with your electrical suspicions. Disconnect battery, and clean PCM connectors as described in when you click the green link below (#1). Then clean the connector on top of the transmission.

I would check all cable adjustments. Pay particular attention to the throttle valve at the transmission. Adjustment doesnt mean anything if the lever is sticking.

If none of that works out, time to drop the pan and replace the solenoids and sensor if you dont see any signs of mechanical failure.

There are also some springs in the valve body that are easy to check/change at this point, but i cant help you there.
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Unread 07-08-2013, 11:07 AM   #3
Registered User
1998 ZJ 
Join Date: Jul 2013
Location: Arvada, Colorado
Posts: 3
Thanks a lot zeejay1997 this is very similar to the path that I was going to take but much more detail and some extras. It will take a a while to go threw the list but I will keep you posted.
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