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Unread 02-11-2014, 08:23 PM   #1
snlmllc
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1996 ZJ 
 
Join Date: Feb 2014
Location: savannah, ga
Posts: 2
42re transmission bafflement

So here's the problem: 96 jeep gc Laredo, with a 4.0 , 6 cyl., 42 re 167000 miles .I bought this jeep that was having shifting problems. Installed re-master solenoid kit, no chunks of anything in the pan, minor amount of filings in pan nothing out of the ordinary. Changed out all solenoids, and speed sensor, installed new filter and pan gasket, new fluid ( atf+4). Worked perfect for 4 days then suddenly stopped working. Cranks up perfect goes into reverse and it does great, put it in drive and again it works the way it should, once it gets up to normal operating temp the transmission will no longer do anything ( doesn't work in any gear. Used a scanner for checking codes everything fine. Pulled the transmission relay to bypass the computer, works great while cold once it gets warm to hot nothing.

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Unread 02-11-2014, 08:30 PM   #2
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville, VIC, AU
Posts: 413
Check fluid level once hot, it will foam & stop working if overfilled. Look for bubbles on dipstick.
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Unread 02-11-2014, 08:48 PM   #3
snlmllc
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1996 ZJ 
 
Join Date: Feb 2014
Location: savannah, ga
Posts: 2
re fluid

Did that fluid levels are correct at temp. Proper color and smell, no bubbles.
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Unread 02-12-2014, 02:00 AM   #4
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville, VIC, AU
Posts: 413
Hmm, thats pretty odd. Are you sure that you've checked it with engine idling, on level surface, tranny hot in NEUTRAL (not park)?

So it loses both forward and reverse gears once hot, is that right?
Revese is pretty much hard-wired so even if you governor solenoid is dead it's still going to work.
That sounds like some major heat-related issue then, either fluid aeration when it heats up and expands,
or oil pump not putting out enough oil when it's hot.

Can't think of anything else, maybe someone will chime in.

P.S: could also be clutches slipping due to oil thinning out when it's hot and compressing clutch packs a bit less.
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