Putting in thicker front driveline - JeepForum.com
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post #1 of 7 Old 04-19-2013, 01:36 PM Thread Starter
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1981 CJ7 
Join Date: Jul 2011
Location: Holyoke
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Putting in thicker front driveline

I had to rebuild my front driveline. I asked a machine shop if he could make a bigger one for me. He said in his experience that for a larger diameter shaft on a suspension lift of 4in on the CJ7 that the larger shaft is going to hit the cross member at full flex. He said I could put in a dual yoke to fix the problem but they tend to wear out faster. Any thoughts suggestions?
1981 CJ7 with a 4in Rough Country lift

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post #2 of 7 Old 04-19-2013, 02:08 PM
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1982 CJ7 
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It will be close as it is with a 4" lift so he's got a point. Don't beef up the u-joints though, you want them to be the weak link in any drivetrain. They are the easiest and cheapest to fix, should things be over stressed. And the 30 isn't a brute to begin with.

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post #3 of 7 Old 04-19-2013, 02:12 PM
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How big of a diameter are you wanting to go to?
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post #4 of 7 Old 04-19-2013, 02:25 PM
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I had a stock rear shaft retubed for my front. Had to notch the skid plate a little but it fit.

'84 CJ-17: 17" stretch, locked Toy axles, 5.5" lift, FI, AX15, D300 w/twin sticks, boatsides & junk.
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post #5 of 7 Old 04-19-2013, 02:27 PM
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Yep, a lot of people just cut a notch in the skid plate

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #6 of 7 Old 04-19-2013, 03:02 PM
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1981 CJ5 
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I also have a re-tubed rear driveline in the front. I have a relatively short transmission (T-177), and have 1/2" clearance at full droop, 2 1/2" lift, though. All sorts of factors make a difference, motor mounts, transmission mount are all new on mine.

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post #7 of 7 Old 04-20-2013, 12:19 AM Thread Starter
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1981 CJ7 
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Location: Holyoke
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Good to know. Not planning on much larger. Have to research it a touch more. Thx for the 411
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