Drive Shaft :-( -
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Unread 09-18-2005, 09:25 AM   #1
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Join Date: Mar 2004
Location: South Africa
Posts: 40
Drive Shaft :-(

Hi Guys

I wonder if any of you can be of assistance? I have an 83 CJ-7 with the amc 20 diff in the rear; I experience some vibrations when I go over a certain speed, (round 120km/h). Friend of mine said the shaft (drive) was too short.

I was wondering what the best method would be to make sure I have the correct length (or get the correct length) drive shaft?

Is the method to measure (front) the centre of the one u-joint to the centre of the other u-joint (one by the transfer case yoke and the other end at the diff). It's currently running a 2.5-inch lift with 1.5-inch rear shackles.

Your advice would be much appreciated


[COLOR=black]2001 TJ, 4" Tera Flex Susp, 33x12.5 Mickey Thompsons on 10" Mickey Thompson Challenger Rims, SYE Toms Woods, Throttle Body Spacer, Rubicon Express Shocks, ARB air lockers front and back, 4.56 Gear ratio, Hanson bumbers front and rear
bruced is offline   Reply With Quote Quick reply to this message
Unread 09-18-2005, 09:33 AM   #2
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Join Date: Apr 2004
Location: pensacola,fl
Posts: 375
Visit tom woods web site and it will show you how and where to measure from.
83 cj7 all stock except lift and tires and all the drive train.
gigihurt is offline   Reply With Quote Quick reply to this message
Unread 09-18-2005, 07:34 PM   #3
John C
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Join Date: Feb 2004
Location: South Carolina
Posts: 537
I wouldn't bet on too Short. With 4" of lift I would imagine your drive shaft angles are too steep. If you are still running your stock shaft you may need a Transfer case lowering kit, make sure your joints are parallel to each other. If you have CV style shaft then you want your rear end to point directly at the T-case universal mount. Hope this helps.
84' Caribean Blue Laredo w/ black leather interior
Frame off restore 6 years ago
7 inch lift w/ 34" TRXUS MT
DANA 44 front Solid axle converted Model 20 rear
AMC 360 / T-400 / Model 300 transfer case
but never forgotten

If I can't hunt it, fish it, f**k it, or wheel it, I might not be that intrested in it
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