Broke down on the trial...bad - JeepForum.com

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post #1 of 21 Old 10-31-2006, 08:02 PM Thread Starter
youngjeeper11
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Broke down on the trial...bad

alright, Im not going to lie, I was beating the crap out of my jeep all afternoon, and finally, while doing donuts, something in my drivetrain broke. it did not make a loud noise, it just suddenly revved, and woundnt move. I dont know if its my pressure plate, transmission or transfer case (read my sig). but even if I have the clutch out, I can shift the gears in my transmission, and it does nothing, no grinding or anything, I think it does grind a little when I try and put it in reverse though, so that makes me think its the transmission. but I mean an SM465 is pretty hard to break, and it was not even under that hard of load, I was doing donuts in dirt! and prior to that I put it under a lot of load getting up rocky hills. none of the driveshafts move no matter what gear the t-case is in, so its not my driveshaft or axles.

So it was quite an adventure towing it back down the trail 3 miles, not to mention my buddies jeep couldnt pull it up a few of the hills, so we had to spend half an hr winching it up each hill. it was quite a nightmare. but I'm proud of myself, I got my first good body damage, I wasnt paying attention trying to get over a rock, and ran into a tree and pushed in my right fender, then ripped half the plastic fender off on another tree. it was a fun afternoon.

Any idea what may have gone wrong? I am going to take out the trans this weekend I guess. any help is appriciated thanks

TJ


Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

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post #2 of 21 Old 10-31-2006, 09:47 PM
Big-n-Broke-YJ
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sounds like the tranny....

possibly a broken input shaft?

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post #3 of 21 Old 10-31-2006, 10:10 PM
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Sounds like you future plans are MUCH closer!

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post #4 of 21 Old 11-01-2006, 08:14 AM
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its your clutch. if u can shift it without clutching (and without power shifting) means your transmission is not engaged at all. same thing happened to my buddy in a mud hole. his tires stopped spinning, and that was that. it could be your input shaft but my money is on the clutch.
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post #5 of 21 Old 11-01-2006, 08:21 AM
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i vote input shaft, my jeep did the same thing only going 75 on the freeway

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post #6 of 21 Old 11-01-2006, 09:00 AM
bharris68
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I would think that if the clutch is still functioning it would be spinning the input shaft. That would make a hell of a racket given that the 465 has a gear-reduction first and 4th. slips pins across the entire shaft to lock it together giving it the 1:1 ratio. It sounds like the shaft in the transmission is NOT spinning at all as a result - so I'm going to vote for clutch.
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post #7 of 21 Old 11-01-2006, 07:26 PM Thread Starter
youngjeeper11
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yea!! thats what I figured too, I figured if the input shaft was broken it would make a lot of noise, and the shifter would act funny. And I was going through mud holes......I am hoping its the clutch because it has a lifetime warranty, which means I get another one for free! I have to get a transmission jack, pulling that SM465 out from under there with only a floor jack wasnt a good idea last time....haha I think I may get a centerforce clutch instead though this time. So what can I do to keep mud out of my clutch?

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #8 of 21 Old 11-01-2006, 10:08 PM
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did you check the air in the tires?

1995 YJ gone as well

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post #9 of 21 Old 11-02-2006, 09:08 AM
bharris68
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stay out of Puddles?
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post #10 of 21 Old 11-02-2006, 09:10 AM
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Quote:
Originally Posted by youngjeeper11
alright, Im not going to lie, I was beating the crap out of my jeep all afternoon, and finally, while doing donuts, something in my drivetrain broke.
And you wonder what went wrong?
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post #11 of 21 Old 11-02-2006, 09:27 AM
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Quote:
Originally Posted by BigJeepJay
And you wonder what went wrong?
X2 way to tread lightly.

But I HIGHLY doubt it would be the SM465 the ax-5 might have blown though ... I would pull the inspection cover for the clutch.

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post #12 of 21 Old 11-02-2006, 11:31 AM
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Quote:
Originally Posted by youngjeeper11
yea!! thats what I figured too, I figured if the input shaft was broken it would make a lot of noise, and the shifter would act funny.

I vote for the shaft. My shaft busted on my '96 Ram, no noise at all, everything else seemed fine, but the truck wouldn't move. Either way you gotta pull it, so you'll know then.
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post #13 of 21 Old 11-02-2006, 12:46 PM
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Where do I begin????????????

Any massive oil or fluid leakage when this abuse occurred?

If your engine is revving, you might have broken a motor mount or more likely a bracket.

If you put it in 4wd, will it move (this would indicate a broken transfer case shaft)?

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post #14 of 21 Old 11-02-2006, 01:23 PM
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It sounds like a blown clutch disc. here is what mine looked like when I blew one up a few years ago (I-6 and the pug-crap tranny). All the rivets to the center hub sheared and the jeep was dead.


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post #15 of 21 Old 11-03-2006, 06:56 AM Thread Starter
youngjeeper11
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ugh. I found the problem. I took the transfer case off, and noticed my transmission output shaft was totally tourqued and snapped in half right between the transfer case and the transmission. This was a shaft I bought with an adapter to adapt the NP 231 transfer case to the SM465 transmission. from Novak. it was like a $200 shaft! Novak is going to get a very very angry phone call this afternoon. That shaft was suppose to be like indestructable, I thought my T-case would break before that shaft. this sucks.

TJ

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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