Rebuilt Transmission -
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post #1 of 3 Old 11-04-2010, 02:58 PM Thread Starter
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2007 JK Wrangler 
Join Date: Jun 2010
Location: Ohio
Posts: 85
Rebuilt Transmission

Hey guys. I just got my jeep back yesterday after some open heart surgery to the tune of a new clutch, transmission rebuild, and rear end rebuild. I told the shop (unfortunately after the fact) about the incorrect information in the manual about what fluid to run in the transmission and he said they put what the book called for, GL5. Prior to the rebuild, it was very hard to shift into the gears with the recommended fluid so I was told to use ATF. After the fluid change, it shifted as smooth as could be. The transmission did need all of the synchronizers replaced but with the GL5 in it, it's shifting extremely hard again. What are the symptoms or results of incorrectly running the GL5 fluid? Does it fit the hard shifting symptoms I'm having? I knew the ATF was just a band aid and now that the tranny is rebuilt, I don't want to go that dramatic of a fluid. Any recommendations to ease getting into the gears? Is it normal to have some stiffness after a rebuild that will decrease as it breaks in? Thanks for the help.

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post #2 of 3 Old 11-04-2010, 03:21 PM
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1999 TJ Wrangler 
Join Date: Aug 2008
Location: MA
Posts: 1,464
From what ive come to understand GL5 gear lube shouldnt be used in the ax-15 because it tends to eat the synchros.
Most people(including me) will suggest using Redline Mt-90.
My tranny has a "crunchy" 2nd gear and I decided it would be a good idea to do a fluid change. When I did I actually performed a side by side comparison with regular Lucas 75-90w gear oil on accident.
The lucas just felt really very heavy in the tranny, took 8 or so tries to get it into gear, when i got that out and put in Redline MT-90 it got much easier to get into gear.
Its not a fix all but it is what gets generally recommended for the ax-15.

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post #3 of 3 Old 11-04-2010, 10:21 PM Thread Starter
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2007 JK Wrangler 
Join Date: Jun 2010
Location: Ohio
Posts: 85
I've read about the redline on here and its nice to hear a positive review for a situation similar to mine. Thanks.
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