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-   -   Tranny Slipping? (https://forums.off-road.com/jeep-short-wheelbase/56569-tranny-slipping.html)

MNT 02-10-2001 12:55 PM

Tranny Slipping?
 
I have a 92 YJ, stock AX15 tranny. Since the axle swap I pretty much use 1st gear as a parking brake. My driveway is sloped pretty good. I just parked this morning put the useless parking brake on, put the tranny in first and killed the engine. I heard a kind of "creaky groan" and the jeep started rolling back. It would roll a bit (4-6 inches maybe) and stop, then start again. Felt kinda like the tranny was trying to hold it, but would roll and grab. Of course I chocked the wheels, but that is not going to solve my problem. Does anyone have any ideas????? Do I need a new tranny? will this get worse? what about a better parking brake system?

Thanks

[img]/wwwthreads_images/icons/laugh.gif[/img] MNT [img]/wwwthreads_images/icons/laugh.gif[/img]

GeeAea 02-10-2001 02:53 PM

Re: Tranny Slipping?
 
Sounds more like cylinder leakage to me..... rolls back 'til it hits a cylinder with closed valves.....stops .......cylinder bleads down......starts rollin' again ......and on...and on.

GeeAea

Figures don't lie ....... but liars sure do figure.

MNT 02-10-2001 03:05 PM

Re: Tranny Slipping?
 
So how do I fix that? re-build the engine? or is it ok for awhile. I don't know a lot about engines, so any help would be appreciated.

Thanks

[img]/wwwthreads_images/icons/laugh.gif[/img] MNT [img]/wwwthreads_images/icons/laugh.gif[/img]

**DONOTDELETE** 02-10-2001 05:54 PM

Re: Tranny Slipping?
 
MNT-

When you swapped out the axles did you lower your gear ratio? Is it possible that it is now easier for the jeep to roll due to gear reduction? It does sound to me like the motor is turning.

Good Luck!
Kirss


MNT 02-10-2001 06:35 PM

Re: Tranny Slipping?
 
Yeah they went from the weak stock 3.33 or whatever to 3.73. I plan on going to 4.11s pretty soon. Is there any way to keep the motor from turning?

Thanks

[img]/wwwthreads_images/icons/laugh.gif[/img] MNT [img]/wwwthreads_images/icons/laugh.gif[/img]

**DONOTDELETE** 02-11-2001 11:49 PM

Re: Tranny Slipping?
 
The tranny is NOT a brake. Any standard tranny car, truck,... will do that roll - stop - roll etc. if the tranny is the only thing left to hold it. The good news is that the tranny should be fine. Have you ever roll started a standard? When you pop the clutch out it learches as it rolls for a couple of cycles before it starts doesn't it?
Have you ever hand cranked an engine with a wrench on the flywheel? If you can turn the engine by hand with a wrench, it's only logical that the weight of the whole Jeep on a hill will do the same thing. The learch is caused by compression leakage as the other posts say but thats because as the weight of the Jeep makes it role, the drive train turns, making the engine turn (like with the wrench) and the cam shaft opens and closes the valves letting out the compression as ir it were running. If you put your key in with it parked like that I guarantee it will jump start itself. Ir you can't make real brakes for it for a while,
Tie the wheel chocks to some nylon rope and attach the rope to the seat post or something by the door. As you park, toss the chock out the door and let the Jeep roll up to it. When you want to leave, pull the rope and the chock comes back into the cab.
Basicly I wanted to say the tranny is fine and this is normal.[img]/wwwthreads_images/icons/smile.gif[/img]

'88 Sahara, 4.2, auto.


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