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Unread 09-08-2009, 08:18 PM   #1
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1984 CJ7 
Join Date: Apr 2009
Location: Jasper, GA
Posts: 312
bent driveshaft question

lost the front u joint on the rear DS going about 50mph two days ago. It hit the underside so hard it put a small hole and a large dent under the pass seat. Didn't have a vice big enough to press in the new joints after removing the old ones. Took it to a shop and had them press them in for me. They told me the shaft is visibly bent and to have it rebalanced.

Has anyone successful had one rebalanced before? Is it junk now or is it salvageable?


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caleb7mm is offline   Reply With Quote Quick reply to this message
Unread 09-08-2009, 08:36 PM   #2
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1993 XJ Cherokee 
Join Date: Sep 2008
Location: Alaska
Posts: 95
if you get a vibration then a rebalance will work if the shaft integrity is still good.
93 cheromanche

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Unread 09-08-2009, 08:38 PM   #3
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1977 CJ5 
Join Date: Nov 2004
Location: Southeast PA
Posts: 1,198
If you drive it on the road and the shaft is bent, it's most likely trashed. It's not worth making it straight again because it's almost the same as making a whole new shaft. Beings as you drive it on the road, I would have one made and balanced. Mine is visibly a banana, but it never sees the road.
1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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Unread 09-09-2009, 10:02 AM   #4
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Join Date: Aug 2002
Location: Colorado
Posts: 14,585
I worked in a driveshaft shop when I was in college and we used to straighten bent shafts daily. We did everything from passenger vehicles, to OTR trucks, to off-road only dump trucks and loaders. To say that it would be as much work as having a new one built without seeing it is foolish. Driveshaft tubing isn't cheap.

Let the driveshaft shop decide what would work. It's amazing what you can do with an oxy-acetylene torch and a blast of air from a compressor to straighten out a bent tube. We would get ours so straight (within 0.003" of runout) that balancing was not necessary.
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