Re: Front Driveshaft talk...caster, pinion angle, etc.
First of all there is absolutely no need for pointing the front pinion at the transfer case output. You don't need a CV joint in the front and using a CV joint is the only time you point the pinion directly at the output. Like jeepgod said the only time that the front driveshaft is turning is when you are in 4WD. Like jeepgod, when I am in 4wd I am going slow and the driveshaft isn't spinning fast enough to create vibrations which are noticed to any degree. The angles are also not going to be extreme enough to warrant any worry about wearing out u-joints prematurely. Vibration from harmonic imbalances and wear on u-joints are the biggest reasons why people rotate pinions and change to CV shafts. With most slow going Jeeps neither of these conditions exist for the front shaft when in 4WD (the only time the shaft is turning). If it were mine I would make my new springpads parallel to the existing springpads and not even worry about what the pinion angle is. This is what the majority of the GW 44 swaps into YJ's that I have seen published on the net have done. I have not seen in one of those webpages where the author has said that they wish they had rotated the pinion. From that I assume that the stock angles on the GW work well when used in a YJ. Your conclusions may vary. BTW, grinding and rotating the knuckles is a major pain in the a$$. The type of driveshaft that you need will be dictated by how much flex your suspension has. You will need one long enough to keep the slip joint engaged while fully extended.
'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274