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Unread 08-15-2011, 05:56 PM   #1
Yjmudding
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1992 YJ Wrangler 
 
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Clutch issue?

Let my friend drive my 92 yj 5 speed standard and when I got it back it will grind going into 3rd and 2nd gear but only when I downshift. I want to find out what is wrong before I replace something I don't have to. Please help!

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Unread 08-17-2011, 09:45 PM   #2
Yjmudding
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Someone help?
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Unread 08-18-2011, 12:23 AM   #3
MiNiSaBa
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Your friend drove your yj like a sports car... NOT GOOD. Synchros or gears might be going bad. Downshifting a yj can not end up with good results.
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Unread 08-18-2011, 12:32 AM   #4
cubewhiz
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sounds like worn synchros to me
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95 YJ with V8 going in, BDS 3.5" lift with MORE 5/8" boomerangs
Toyo Open Country M/T 33x12.50R15 on Cragar Soft 8 15x8 wheels
[URL="http://www.jeepforum.com/forum/f12/bobs-build-thread-1081112/"]My Build Thread[/URL]
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Unread 08-18-2011, 06:53 PM   #5
Yjmudding
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What are synchros?
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Unread 08-18-2011, 07:00 PM   #6
oldtime_ironman
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Quote:
Originally Posted by Yjmudding View Post
What are synchros?
Synchros are parts inside the trans that help the gears line up so you can shift. If they wear out, the gears won't line up just right, and they will grind against each other. It's basically a transmission rebuild.
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Unread 08-18-2011, 07:28 PM   #7
Yjmudding
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But it only grinds when I downshift and only in third and second gear
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Unread 08-18-2011, 07:44 PM   #8
oldtime_ironman
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Quote:
Originally Posted by Yjmudding View Post
But it only grinds when I downshift and only in third and second gear
Give it time, I'm pretty sure the grind will get worse eventually. Meanwhile, I would go real easy when you shift, try to "feel" when the gears are gonna "snick" in and line up. Try to match speeds pretty close.
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Unread 08-18-2011, 07:51 PM   #9
Yjmudding
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I've gotten pretty good at getting it right with almost no grinding. But how to I go about fixing it?
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Unread 08-18-2011, 08:03 PM   #10
oldtime_ironman
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Quote:
Originally Posted by Yjmudding View Post
I've gotten pretty good at getting it right with almost no grinding. But how to I go about fixing it?
Mean Max has the most awesome write-up about how to. With pics of everything. Look here:

http://www.jeepforum.com/forum/f12/m...ebuild-1032480

He's the resident expert at transmission stuff. Big time.
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Unread 08-18-2011, 08:10 PM   #11
Yjmudding
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Thanks for that link. That looks too confusing but my friends dad works on transmissions so I'll have him fix it in return for some work I can do for him. Thanks for the help everyone!
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Unread 08-18-2011, 11:29 PM   #12
cubewhiz
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This is a synchro ring.



and a whole synchro hub.



and here you can see them located sporadically in the transmission (look for gold). This isn't the same transmission as you have, but the idea is the same.



Those gold synchro rings wear down. When you buy a rebuild kit, it comes with new rings. The parts are cheap (only a couple bucks a piece). It's the amount of work involved that makes the job a pain in the ***.
__________________
95 YJ with V8 going in, BDS 3.5" lift with MORE 5/8" boomerangs
Toyo Open Country M/T 33x12.50R15 on Cragar Soft 8 15x8 wheels
[URL="http://www.jeepforum.com/forum/f12/bobs-build-thread-1081112/"]My Build Thread[/URL]
--------
My new Jeep: 95 ZJ with 4.0L I6 (auto trans)
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Unread 08-18-2011, 11:37 PM   #13
Yjmudding
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Thanks for those pics. That looks a lot less confusing than he pictures in the other link I looked at
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Unread 08-18-2011, 11:53 PM   #14
cubewhiz
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Quote:
Originally Posted by Yjmudding View Post
Thanks for those pics. That looks a lot less confusing than he pictures in the other link I looked at
Haha, yes. Well, what I showed you was a 1974 GM SM465. It's a 4 speed transmission with a main case and the gears go inside, disassembled by removing the top shift cover. The AX-15 has three major pieces so the rebuild proceeds a bit differently, but you get the idea.

The point is that the synchro ring has teeth on it. The teeth line up with the hub assembly and allow the shift fork to move the slider, thus engaging a different gear. When those rings are worn, you hear grinding as you shift and shifting is no longer smooth.

I have a Mitsubishi FM146 sitting in my driveway with 4th gear synchros shot to hell that I've been meaning to check out.
__________________
95 YJ with V8 going in, BDS 3.5" lift with MORE 5/8" boomerangs
Toyo Open Country M/T 33x12.50R15 on Cragar Soft 8 15x8 wheels
[URL="http://www.jeepforum.com/forum/f12/bobs-build-thread-1081112/"]My Build Thread[/URL]
--------
My new Jeep: 95 ZJ with 4.0L I6 (auto trans)
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