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Old 02-17-2013, 05:55 PM   #1
RandomYJguy's Avatar
Join Date: Nov 2012
Location: LaCrosse WI
Posts: 263
U Joints n Driveshafts

Hey guys

had the jeep up in the air on a lift earlier today. The front drive shaft (from the case to the front axle) u joints are pretty much gone.

What my main question is, that drive shaft, is that constantly spinning when the jeep is in motion? Or is that shaft only engaged when the 4wd is being used?

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Old 02-17-2013, 06:04 PM   #2
Join Date: Feb 2013
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The front driveshaft disengages from the transfer case, the front driveshaft spins freely as the front wheels spin, but power is only applied to the FDS when 4WD is engaged.

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Old 02-17-2013, 06:04 PM   #3

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Location: North Las Vegas
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Unless you are permanently locked the shaft shouldn't spin.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.

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Old 02-17-2013, 06:47 PM   #4
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Originally Posted by jokerchief462 View Post
Unless you are permanently locked the shaft shouldn't spin.
1987 YJ 4.2L I6 5-Speed, SOA, 1"shackle, Chrome Diff Cover Rear, Lime Green Under Parts
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Old 02-18-2013, 07:42 AM   #5
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Location: JAX, FL
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Best to check the front axle by lifting and spinning the RS tire to see if the DS turns. At least you will know if you either have a problem with your CAD system or the PO did the fork lock. My guess is you will find the fork modification done and the DS not balanced. Unbalance will contribute to Ujoint failure quicker than normal. Or it just may be time to replace them!
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