Rear Grinding - Transmission won't engage - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 11 Old 12-21-2013, 03:15 PM Thread Starter
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Rear Grinding - Transmission won't engage

Been searching the forums and Google for ahwile with no luck. Washed my 2008 Unlimited (manual trans) in drive through car wash (28 degrees here). When I put it in first to exit I heard a cluck and slip in the rear end. Everything was fine for awhile. Did some Christmas shopping and when trying to merge and exhilerate in traffic in first I heard a BIG clunk and then grinding in the rear and no motion. Slipped in 4 Hi to get out of traffic and limp home. Parked on a flat surface and and slowly let out the clutch in first and reverse. RPM's went from about 600 to 500. No fluid leaks showing. Ideas/things to check? I might add this is all stock except I bought it with 35's.
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post #2 of 11 Old 12-21-2013, 03:28 PM
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I would drain the rear diff fluid and remove the cover. check for parts or pieces in the bottom of the diff. Good luck......
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post #3 of 11 Old 12-21-2013, 03:38 PM Thread Starter
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Thanks. Will see if I can get to it tomorrow and take a look. Guessing this will NOT make my Christmas merrry :-)
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post #4 of 11 Old 12-21-2013, 04:41 PM
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Most likely not, but you proabably won't be as bad off as I was. I too heard a big clunk and then grinding from the rear end. My front pinion bearing shit the bed. The "clunk" was when it took out the race in the housing. I had to replace the entire rear axle housing, ring gear and pinion. That was stupid expensive! I hope your is not nearly that bad. Most likely not. Mine was a pretty rare failure. Good luck.
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post #5 of 11 Old 12-22-2013, 04:22 PM Thread Starter
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Drained the diff and pulled the cover. Found metal shavings and larger chunks. Couldn't see any thing obvious. Off to the shop .
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post #6 of 11 Old 12-22-2013, 04:26 PM
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Were the chunks:

1. ring gear pieces
2. Pinion gear pieces
3. Bearing pieces
4. Unknown

I hope its not bearing pieces..............
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post #7 of 11 Old 12-22-2013, 04:27 PM Thread Starter
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Metal chunks

Chunks found in rear diff fluid

Last edited by G4willy; 04-10-2014 at 01:08 PM.
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post #8 of 11 Old 12-22-2013, 04:40 PM
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Did you see any damage to the gears?? If not, that is probably bearing fragments.........
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post #9 of 11 Old 12-22-2013, 07:32 PM Thread Starter
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Didn't see any damage on the gears. Going to get my dental mirror tool and take a look at the back side.
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post #10 of 11 Old 12-28-2013, 01:57 PM Thread Starter
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Axle splines sheared

Looks like I found the problem. Sheared rear axle splines. Are chromoly worth the price difference?

Last edited by G4willy; 04-10-2014 at 01:11 PM.
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post #11 of 11 Old 01-11-2014, 08:55 AM Thread Starter
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Great lesson learned here. Should have pulled the diff and taken a look. Installed new Ten Factory chromoly axle shafts and first day no issues. Next day same exact thing happened when merging into traffic on interstate. Limped home and pulled everything apart and out. New axle shaft spline shear and cracked carrier. Going with ARB air locker with onboard air, Nitro 35 spline axle shafts and regearing to 4.88 while I am at it. Hoping I can get warranty on Ten Factory and put them up for sale.
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