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Unread 05-26-2013, 11:52 PM   #1
steamnsteel
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2006 LJ Wrangler 
 
Join Date: Apr 2010
Location: East TN.
Posts: 112
93 ZJ Shifting Problems

A friend of mine has 93 ZJ 4.0 with the select trac system and it has suddenly started having shifting trouble. First it started indicating that it was running in 4wd but it is not and there is a meesage saying service 4wd switch when the t-case is shifted to 4 hi or 4 lo. Also, at about the same time 1st and 4th gear went out and when shifting from park to drive the transmission selects 3rd, he can manually shift to 2nd but when trying for 1st it stays in 2nd.

TPS is testing fine but the governor pressure sensor solenoid is not closing completely but appears to be opening as it should by doing a bench test with voltage.

This jeep is strictly a street driven and bad weather vehicle for college, 214,000 miles with never having any problems and the fluids all appear to be good. My idea is that the solenoids are bad and his testing seems to confirm this. He has tried posting here on the board but has not been able to yet, this fellow lives 2 hours down the road from me and would appreciate any positive ideas before dropping coin on parts.

Recap:

He can manually shift 2nd and 3rd but did not say anything about reverse.
1st and 4th are not selecting.
TPS checks good by his method.
Fluid is good and no metal in the pan.
Govenor pressure solenoid appears to not be closing completely.

Thanks for the help.

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2006 LJ Rubicon 6 speed: Currie arms, Currie Track Bars (They don't hit either), Nth tuck, Nth Springs and oil pan skid, JKS mml, bml, Antirock.

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Unread 05-27-2013, 08:54 AM   #2
steamnsteel
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2006 LJ Wrangler 
 
Join Date: Apr 2010
Location: East TN.
Posts: 112
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2006 LJ Rubicon 6 speed: Currie arms, Currie Track Bars (They don't hit either), Nth tuck, Nth Springs and oil pan skid, JKS mml, bml, Antirock.

I un-insatalled the wife mod.....lost one Jeep.
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Unread 06-14-2013, 03:15 AM   #3
zmrtoppcop22
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Join Date: Oct 2012
Posts: 1
Quote:
Originally Posted by steamnsteel
bump
I am having the same problem with my 93 grand Cherokee transmission . When I put it into drive its very sluggish starting out. If I put it into 2nd starting out there's pickup to it and then I shift it manually into drive and it goes fine. So reverse is fine too. It seem I don't have 1st gear or overdrive. Please help me out. Fluids good not burnt. I'm stumped.
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Unread 09-17-2013, 08:26 AM   #4
woodyvw9
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2008 JK Wrangler 
 
Join Date: Jul 2011
Location: Concord, CA
Posts: 40
Did you ever get this figured out?

My 93 ZJ with 46RH was doing this and I did a fluid/filter change and everything was back to normal. The filter was pretty dirty.
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Unread 09-17-2013, 10:12 AM   #5
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss, Italy
Posts: 16,374
Replace the gov pressure sensor and solenoid. Do the filter at the same time with fresh fluid. When they start going bad it really messes with the shifting. Borg Warner makes some heavy duty units with larger valving.
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Unread 09-17-2013, 10:18 AM   #6
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,300
On my 93 the problem was the transmission control module. Replaced the sensor and solenoid with no improvement. Found a post on here about a bad TCM and took a chance on a junkyard unit for $35. It's been over two years now with no issues.
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Unread 09-19-2013, 01:47 PM   #7
1ATony
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1997 ZJ 
 
Join Date: Apr 2009
Location: mass
Posts: 4,630
You may want to flush the transmission, and change the tranny filter. There could be a small piece of debris floating around in there that's clogging up the valve body, or the filter could be clogged too. A total fluid change won't hurt anything. This has helped me on more than one occasion.

Tony
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