YJ Transmission issue - JeepForum.com

 
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post #1 of 8 Old 07-12-2015, 09:38 AM Thread Starter
AZDeez
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1988 YJ Wrangler 
 
Join Date: May 2007
Location: Phoenix
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YJ Transmission issue

I probably need to do some more research on other sites but I always end up here for the good answers. So the stock YJ is not wanting to downshift nicely nor shift into 5th. The rest of the gears on upshift seem fine. Occasionally it is dificult to get into first after coming to a no clutch engaged stop. I have to give it a little clutch and then it will drop into first for me.
Soooo, I am thinking some sort of synchronization problem.
Ready go and thanks in advance.


88 YJ 4.2, 3.5 BDE Spring lift, 33s, - Her WIP
94 XJ 2wd utility work vehicle - no mods
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post #2 of 8 Old 07-12-2015, 11:20 AM
Jeepsr4me
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Heres a tip... Use the clutch to disengage and reengage gears.... that may be why you having issues now.
But it sounds like the main bearings are goiong out and syncros.
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post #3 of 8 Old 07-12-2015, 02:15 PM
Mike Romain
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I have as feeling you worded some of that wrong. If you have to rev it to get it to shift, I would be checking the clutch fluid first...
The wrong type of gear oil in it can also mess up the syncros. My T-5 went bad like that from GL5 gear oil. I switched to GL4 or synchromesh gear oil and all was good again.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
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post #4 of 8 Old 07-12-2015, 02:43 PM
SunDevilJeeper
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Quote:
Originally Posted by Jeepsr4me View Post
Heres a tip... Use the clutch to disengage and reengage gears.... that may be why you having issues now.
But it sounds like the main bearings are goiong out and syncros.
I don't think he's floating the gears. Sounds like he's having some other kind of issue.

1991 YJ: Daily Driver
1992 YJ: Pile of crap sitting in the garage.
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post #5 of 8 Old 07-12-2015, 02:51 PM Thread Starter
AZDeez
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So I'm thinking my first step is to flush the trans fluid and inspect for shavings of course. Next is the trans shop for advice. I'm a shade tree hack of a mechanic so do I have any business dropping and possibly rebuilding?

88 YJ 4.2, 3.5 BDE Spring lift, 33s, - Her WIP
94 XJ 2wd utility work vehicle - no mods
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post #6 of 8 Old 07-13-2015, 02:55 AM
SunDevilJeeper
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It definitely sounds like syncros are going out. If it were my Jeep, I'd just rebuild it.

My transmission went out a couple months ago, the PO claimed it was rebuilt 20,000 miles ago. The lie detector test (mechanic) determined, that was a lie! And, since it isn't cold here it definitely won't be the shifter boot being the problem.

Before my transmission took a dump, the syncros were getting kind of funky, then the front input seal blew and leaked all the oil out right as a I got into Buckeye.

Then there's the possibility of something giving up in the clutch assembly.

1991 YJ: Daily Driver
1992 YJ: Pile of crap sitting in the garage.
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post #7 of 8 Old 07-13-2015, 02:58 AM Thread Starter
AZDeez
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So Sundevil, any recommendations for a trans shop? I'm not confident I'm ready to dig into my own rebuild.

88 YJ 4.2, 3.5 BDE Spring lift, 33s, - Her WIP
94 XJ 2wd utility work vehicle - no mods
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post #8 of 8 Old 07-13-2015, 03:06 AM
SunDevilJeeper
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1992 YJ Wrangler 
 
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Location: Buckeye, AZ
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The guy who rebuilt my transmission is over in Buckeye, cool guy. All said and done with installation of a new clutch assembly with master cylinder ran me a little over $1000. I bought a LUK Pro Gold kit off rockauto.com and had him install it along with the rebuild.

Bison Automotive Repair.
2201 N 201st Ave
Buckeye, AZ 85396
(602) 570-1452
Matt.

He's also a Mopar guy, and apparently isn't a stranger to Jeeps. So there's a bit of relief.


EDIT: Also, if you have the tools and that price (which is the average price from what I found out after calling around) doesn't sit well with you, the AX15 is actually pretty easy to rebuild. I've rebuilt a couple of them, and I would have done it again but all my tools are back in CA. There's a lot of good write ups on here, and some good videos on youtube that take you through it step by step. That's how I learned.

1991 YJ: Daily Driver
1992 YJ: Pile of crap sitting in the garage.
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