Driveshaft Trouble

[Aaronsjeep]

looks like you need a few upgrades,as people mention in above posts
sye, new shaft to suit, 4.11 gears to suit 32 inch tyres, or 4.56 may be better imo.

or drop your jeep back down to 2 inch lift. make sure driveline angles are all ok.

[bonza]

Originally Posted by TJ Chaddy

I have a SYE, double cardon driveshaft, not sure about the control arms. Ill defineatly look into getting motor and transmission mounts. Im in the middle of saving for 4.11 ratio change and air lockers.

adjustable control arms to dial in the correct angle of the rear drive shaft are essential

so is regearing. basic mechanical engineering really, with a higher diff gear ratio, that means more strain on the drive shafts, transfer and transmission. regear the diffs to a lower ratio and the strain is greatly reduced. I assume you have 3.07 diffs so going to 4.11 will reduce the strain and effort by well over 30%

think of it as a lever trying to prise a large 1 tonne rock using a crow bar 2 meters long, takes a lot of exertion to move the rock and you would probaly strain a muscle (your drive shaft). use a 4 meter crow bar (regearing) and it suddenly becomes easy on the muscles

[TJ Chaddy]

Originally Posted by Cornelius

Did you get a bit of drivetrain vibration while on the blacktop ? Like a droning noise under load or decelleration ? I'm getting that at the moment after a 3 " lift install. Advice from Wooders via Superior Engineering is that I need adjustable rear uppers to correct the angle of the SYE double cardan rear tail shaft ...........else uni's will snap and stuff will wear out and the car would continue to drive like sh@t. So the adjustables are on order .........more money down the Jeep hole ............

There used to be a slight vibration at high speeds even though my wheels and tyres are balanced. and it does feel like its coming from the driveshaft. so maybe i need the same thing. Ive noticed last night when i was under the car that the angle of the driveshaft in comparison to the diff is quite substancial. im looking at getting a tummy tuck also so maybe when i get that, i look at getting engine and transmission mounts. Diff hangs too low too :P