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post #1 of (permalink) Old 12-28-2000, 07:23 PM
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Drive shaft angles

What is the maximum amount of suspension lift you can get away with on a CJ7 without adversely affecting the drive shaft.



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post #2 of (permalink) Old 12-28-2000, 07:36 PM
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Re: Drive shaft angles

Don't know for sure but every YJ lift add I've seen for 4" suggests transfer case modifications. You should be fine with about 3" of lift and 1" spacers between the trans case cross member and frame rails. Just a guess but the CJ7 and YJ are about the same size.

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post #3 of (permalink) Old 12-28-2000, 08:09 PM
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Re: Drive shaft angles

Well, what do you mean by adversly? If you mean no discernable difference over the stock setup then I wouldn't go more than 2.5 inches suspension lift. I have a 4 inch SUA lift, with a transfer case drop (1") and I have a vibration. Other than being a little annoying it hasn't caused any other problems. I did have to replace ujoints, which was probably attributable to messed up angles, but i don't know that for sure and they are cheap, so WTH. I've run my jeep for a year like this, but being trail rig and weekend driver that's only about six thousand miles. I will be eliminating the Tcase drop and going with CV shaft next month.


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post #4 of (permalink) Old 12-28-2000, 08:37 PM
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Re: Drive shaft angles

With the 4in super lift kit and not dropping the tcase. I have no problems at all. No vibes and i havent broke a u-joint, but i am anal about greasing them after ever ride. If i dont wheel then once a month. The superlift kit came with shims for the back so that helps. The longer shackles also help by tilting the pinions up. I drive mine 6 days a week and wheel at least once a month.

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post #5 of (permalink) Old 12-28-2000, 10:09 PM
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Re: Drive shaft angles

After about 2.5" you'll need to lengthen the shaft.

As long as the angle of the t-case output shaft and the angle of the pinion are the same (or within a degree or so) there should be no vibration problems. But the more you increase the angles by lifting, the faster the u-joints wear out.
15 degrees is the manufactures suggested max, after that a cv joint is a good idea. I ran a shaft at 23 degrees for a few years and replaced u-joints about every 6 months, also needed to grind the yokes for clearance.

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