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Unread 10-20-2013, 07:00 PM   #1
zeronight
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bent front drive saft.

i was under the jeep looking for a gas leak when i noticed that my front drive shaft was bent. its got a bad bend in it and just a month ago it was fine. i have no idea how it happened as i haven't done anything but drive it on the street. how important is it to be straight? i want to be able to drive it in 4hi in the winter for getting to work.

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Unread 10-20-2013, 08:34 PM   #2
lucdog
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Are you sure it's not just the slip joint? Get under the jeep and see if you can move it around at the joint.

B
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Unread 10-20-2013, 09:02 PM   #3
Spieg8
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If you're going to drive in 4hi, it's pretty important the front shaft be straight and balanced, or you'll get a vibration. Is it bent, or is it twisted (like a corkscrew)? Can you see any evidence of contact around the bell housing/transmission?

lucdog is correct in suggesting that it may just be a worn slip joint. It can look like the shaft is bent when it's really just free play... either way, you'll want to repair/replace it before you need it.
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Unread 10-20-2013, 09:21 PM   #4
zeronight
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i dont feel like taking a pic right now but it defenatley has a bow to it. and theres no evidence of any contact with anything. the last time i used 4wd was when i was using it to pull out some bushes in the front yard. could that have done it?
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Unread 10-20-2013, 09:36 PM   #5
WSS
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If it is indeed a bow, then it is most likely the driver and not the bushes. Hard to tell. Is this your first CJ?
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Unread 10-20-2013, 09:43 PM   #6
jeepwhore
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Were you pulling the bushes in reverse? I'm pretty sure yanking people out in reverse is what bent my stock front shaft some years back. I don't have a clue why that would do it as the axle moves away from the t-case under compression. But it's the only thing I had done with my jeep other than drive it.
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Unread 10-21-2013, 06:00 AM   #7
zeronight
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That's exactly what I ended up doing. I couldn't get the winch to pull without dragging the Jeep so I tossed it in four low locking the hubs and backed out pulling the bushes I had no idea that could bend the crap out of my front driveshaft though
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Unread 10-21-2013, 06:06 AM   #8
yahwhy
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Note to self,''No pulling in reverse''
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Unread 10-21-2013, 06:20 AM   #9
shadoow
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Quote:
Originally Posted by yahwhy View Post
Note to self,''No pulling in reverse''
yea, really. I'd like to hear how pulling in reverse causes the front driveshaft to bend...not something that would have popped to mind if i were doing it
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Unread 10-21-2013, 08:16 AM   #10
WindKnot
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I would never have guessed it would hurt the drive shaft, but I was told when I was a young lad that pulling anything heavy in reverse was a bad idea because you're using the "wrong side" of the gears in the drive train. I don't know if it's true, but for some reason it seemed to make sense to me at the time and I've avoided doing that.

My guess is also the slip joint, but my view from here is obstructed.
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Unread 10-21-2013, 10:19 AM   #11
80cj
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Did the front wheels take a hard bump going forward? That would cause the front axle to move backward momentarily possibly bending the drive shaft. Just a suggestion.
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Unread 10-21-2013, 11:52 AM   #12
lucdog
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I agree with not pulling anything heavy, or creating a shock load in reverse. In my personal experience, the ring gear teeth would let go first.
I also think it would twist the shaft instead of just bending it.

So tell us exactly how much force was used pulling the bush out. The Jeep on a paved surface, 4000 rpm, slack in the strap causing a shock load to the drive line when tightened?

Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 10-21-2013, 12:16 PM   #13
iluvcowjuice
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I bent a drive shaft by hitting a guard rail once. What's the length? I have a few extra that are collecting dust on the shelf.
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Unread 10-21-2013, 06:19 PM   #14
zeronight
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i had a strap around the bush and i had the winch cable hooked to it. i tried to use just the winch but even with the breaks on it was pulling the jeep to it so i put it in 4low and went forward for some slack and then i backed up. 3 or 4 pulls pulled the bush out. it wasent that difficult and i had no idea that this could hurt the jeep. i feel this is a weak point that i didn't know about. according to quadratech the length i need is 31.75 collapsed.
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Unread 10-21-2013, 06:20 PM   #15
zeronight
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i never hit over 2500rpm and i was on pavement.
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