ok now that i know i have a 6" rough county lift what should my front and rear pinion angle be
Question: does the pinion angle for this layout on top (with C.V. driveshaft) cause negative (bad) castor angle? Assuming yes because I don't know how many other answer could be possible: Is the only way to fix that to cut off the axle mounting hardware for the control arms and spring perches and weld them back on in new locations?
The front pinion angle can cause a bad caster angle but not always enough to need to work like that. The usual and most accepted way of setting the front pinion angle is, as above, to adjust it for as much caster angle as you can get until you get u-joint vibrations from excessive pinion angle, then back off the caster angle just enough to stop the vibrations. Pinion angle always takes precedence over caster angle.Question: does the pinion angle for this layout on top (with C.V. driveshaft) cause negative (bad) castor angle? Assuming yes because I don't know how many other answer could be possible: Is the only way to fix that to cut off the axle mounting hardware for the control arms and spring perches and weld them back on in new locations?
Not usually an issue in the front.
Set the angle to get enough castor for return to center.
Or as far as you can go without vibes.
It is what it is.
Also, I think you would have to cut the knuckles off and remount to do what you're thinking.
Why did the professor not mention a clear differentiation between a double u-joint standard driveshaft and a triple u-joint double cardan?Here's a fantastic video on adjusting pinion angle. This guy is the professor when it comes to Jeep work. Wish he'd do more videos.
This is for a Rubicon YMMV
Here's a fantastic video on adjusting pinion angle. This guy is the professor when it comes to Jeep work. Wish he'd do more videos.
This is for a Rubicon YMMV
Actually the Jeep Professors are @Blaine and the guy that works with him....
Actually the Jeep Professors are @Blaine and the guy that works with him....
Why did the professor not mention a clear differentiation between a double u-joint standard driveshaft and a triple u-joint double cardan?
For your 4" suspension lift you should not be running the factory rear driveshaft, you need a double-cardan (aka CV constant velocity) rear driveshaft. For the DC driveshaft your 4" suspension needs the angles should not match between each end. The driveshaft u-joint angles produced by a 4" suspension lift on the SWB TJ are excessive which causes them to vibrate. The correct DC driveshaft angles should look like this....which is why I mentioned it was for a Rubicon. The key points are the angle match between each end.
We almost never don't run a Double Cardan shaft on a Rubicon with 4" of lift. Neither should you.which is why I mentioned it was for a Rubicon.
The only problem with that is what do you do if you still have vibes? Thoroughness would include that he is describing an anomalous install and anyone paying attention should be running a double cardan, if one wanted to be thorough.The key points are the angle match between each end.
By 'Professor' I merely mention that he is very thorough with his explanations.
Perhaps you meant Mister Blaine, not Plain Blaine who hasn't been seen since 2015.