I appreciate all of the help, so here's a pic of what I have completed so far. I did have a question a/b the rear driveshaft, I am putting on a Trail Gear 5" rear lift, but I am also putting on a t-case doubler. I want to run my stock rear u-joint style driveshaft (let me know if you think this is a problem), but I need to determine the angle. I know the tcase and third member need to be at the same angle, but I want to put my drive shaft in and drive my truck to another shop (to flex it on a fork lift) before I put the doubler in. What angle should I put the third without the doubler now so as not to have vibrations when the rear shaft gets shortened 6.5" for the doubler? Thanks for the help!

 

Why don't you just measure back the 6.5" + the 2" or so for the ujoint from the center of the transfer case flange. There is the point your pinion should be pointing at.

 

Just don't over rotate the rear axle or you will have worse problems.

If you are doing things all at once now, install your dual cases FIRST, then the rear lift and point the rear pinion at the actual spot.

Your tcase and your 3rd member at the same angle?

Run a double cardan on the rear d-shaft and you will thank yourself later.

 

[QUOTE=waskillywabbit;51142024]
Your tcase and your 3rd member at the same angle?
QUOTE]

I was trying to get away with running u-joints, and I think its right for the angle on the tcase and third member to be in parallel planes. Now, if you think there will be problems, I have a spare front drive shaft with a double cardan that I could take to a drive shaft shop and have then weld and balance it I suppose. I just trying to save money without cutting corners if thats possible. I didn't know if the length would be short enough to warrant a double cardan on the rear.

 

i have a 5" allpro lift in the rear, stock pinion angles and d-shaft lengths ( with no cardan joint) work perfect (no vibration). the rear 3rd flange and the tcase flange are @ the same angle. if you just want to drive it before a doubler kit, the stock setup(d-shaft/pinion angle with a 5" lift works great.

not sure about the no cardan joint with the duals though.

 

I'm running TG 5" rears. I pointed the pinion at the tcase, welded my perches on and called it good. I later installed duals, shortened my shaft and it doesn't drive any different than before. No problems at all. I have a CV for the rear but never installed it, it's fine.