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Unread 08-29-2014, 04:29 AM   #1
halmc
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1992 YJ Wrangler 
 
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Hard shifting Trans lube?

My '92 YJ 2.5 shifts back and forth from first, second and third just peachy. After that, it's often a task to get it from third to fourth, and sometimes from fourth to fifth. Each of those difficult shifts involves some minor gear crunching and it's often very difficult to get it in the gear selected. Sometimes I have to go from third to fifth, cuz can't get it in fourth. Downshifting from fifth to fourth is much easier (tho it does produce a bit of crunch) and fourth to third is always easy and normal.

The transmission is full of lube, and the jeep has about 132Kmiles on it.

I'm thinking a rebuild kit w/synchros, but figured I'd ask anyway: any chance I can lessen this **** with any particular brand/weight of trans lube, and if so, which kind? I'd rather not rebuild the trans but can if I have to.

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Unread 08-29-2014, 05:45 AM   #2
Drednot
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Ive always had good luck with Redline MTL, or MT90.


I just put in in my new YJ with 220K miles, and It stopped all gear clash as soon as I pulled out of the driveway.
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Unread 08-29-2014, 05:58 AM   #3
Kick
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Lucas gear oil is good stuff too
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Unread 08-29-2014, 07:38 AM   #4
JeeperDon
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1993 YJ Wrangler 
 
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I'd drain the fluid and check it out, look for debris, etc. I use regular 10W-30 motor oil in my Jeep standard trans, which is what the dealer recommends too since they altered the formula in gear oil.
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Unread 08-29-2014, 08:08 AM   #5
DessertRatt07
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Could this be a clutch issue? Just wondering. I have the same issue except a bit more excessive. I can't go into reverse without a nice loud grind. I replaced the clutch, slave and clutch cylinder. I'm pretty sure I bled the heck out of it but still grinds. Will a good lubricant really make a difference?
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Unread 08-29-2014, 08:23 AM   #6
JeeperDon
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Quote:
Originally Posted by DessertRatt07 View Post
Could this be a clutch issue?
The clutch has no clue which gear you are using, wouldn't let some gears work fine and others not.
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Unread 08-29-2014, 10:03 AM   #7
mike134
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Desert Rat, reverse is not synchronized. Try this to stop reverse from grinding. Come to a full stop, push the clutch in, shift to second, immediately shift to reverse. That should synchronize your transmission before trying to engage reverse gear.
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Unread 08-29-2014, 09:08 PM   #8
JeepRestoration
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1989 YJ Wrangler 
 
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I had a very similar problem. I was double clutching, repeatedly attempting to get it into 1st (downshifting) and second gear up shifting. I was convinced the transmission was going. Then the clutch master cylinder completely failed. When I replaced it, the problem was gone.

Before you do transmission work, try swapping the clutch master cylinder. Apparently it begins to fail and doesn't completely disengage the clutch. The tiny amount of drag causes the transmission to no synchronize properly.
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