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Unread 03-23-2012, 05:28 AM   #1
AVR2
Web Wheeler
1993 ZJ 
 
Join Date: Apr 2007
Location: UK
Posts: 2,280
Slight jerk from back end when accelerating hard

My 2005 KJ has started making a slight jerk from the back end when you're moving slowly - say about 20-30 mph - and then open the throttle up. There's no wheelspin or noise, just a slight sensation of the back end "catching up" with what the engine is doing. It only lasts a fraction of a second.

Is it likely to be a driveshaft or (gulp) diff issue? It's still on the original rear driveshaft, although the front was replaced about 2 years ago. The trans was rebuilt less than six months ago, so I'm not thinking it's a transmission problem.

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Unread 03-23-2012, 05:41 AM   #2
notstuck
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1986 CJ7 
 
Join Date: Feb 2012
Location: casper, wyoming
Posts: 14
Try greasing the spline in your drive shaft, check axle u-bolts, make sure they are tight. Drop the diff cover and inspect the spiders. Remember.... wheel....bend........repair.......repeat.
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Unread 03-23-2012, 05:49 AM   #3
AVR2
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1993 ZJ 
 
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Cool, thanks. If I open up the diff, what am I actually looking for? Obvious signs of mechanical damage?
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Unread 03-23-2012, 04:37 PM   #4
jamesdart
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1978 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: nj
Posts: 553
i have a similar thing going on with mine, i think its in the Y link. either the bushings or the ball joint.
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Unread 03-23-2012, 09:05 PM   #5
notstuck
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1986 CJ7 
 
Join Date: Feb 2012
Location: casper, wyoming
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Look for the obvious. Also check the pinion yoke. I have spun the pinion on my old cj a couple times. rear diffs are not that hard. Get a manual for youre model of rear/front diffs and tear into it. Pay close att. to torq specs
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Unread 03-24-2012, 02:10 AM   #6
AVR2
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1993 ZJ 
 
Join Date: Apr 2007
Location: UK
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If it turns out to be worn components inside the diff, can you make repairs with the axle on the Jeep? I just don't have the facilities for dropping the axle and working on it off the Jeep. Everything has to be done in the parking lot of my apartment building.
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Unread 03-24-2012, 04:01 AM   #7
notstuck
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1986 CJ7 
 
Join Date: Feb 2012
Location: casper, wyoming
Posts: 14
I am a backyard mechanic at best but yes you have to pull axles to get the guts out Check all mounting points Suspenion bushings and mounts. Sometimes a second pair of eyes helps also. A buddie and a couple beers and look at everything might be something simple. At least I always hope so. good luck.
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