Originally Posted by robert
I have a 91 supercab 4x4 and I was wondering how how much lift I can do before I need to get new driveshafts
I have a 91 4x4 with 7 inches of suspension lift and my drive shafts are just fine but it's not the supercab so that may make a difference. I clear 33's just fine but can still rub them all over the fenders because of how square they are and that's with a 3inch body lift on top of the 7 inches of suspension. 35's will fit just fine until you start flexing it.
My concern is with the rear end. I'd say some traction bars are a must. With the 33's I get enough axle wrap to break the rear u-joint any time I want. It's not good. Can't floor it in first or second gear without breaking it. And I've only got a one inch block/wedge in the rear. If you end up running a three inch block which comes with a few of the lifts then you'd really want to be careful with it. I'd stay away from them at all costs to be honest. I guess it also depends on which motor and gear ratio you've got. I have the 4.0, 5spd and stock 3.55 gears so it puts a lot of stress back there.
Anyway, that's just what I've experienced personally. Hope some of this is helpful.