Well, this is embarrassing. I took my driveshaft in to have it serviced and can't remember which direction it goes... does the slip yoke go toward the diff or the t-case? I tried searching and found pics and people saying it goes both ways...it's a 95 4x4 v6 auto if any of that makes a difference. Pics would be great.

 

I believe toward the diff

 

Rear DS Slip yoke was at the t-case originally on all one piece driveshafts, and at the diff on all 2 piece DS's. But,,, lot of wheelers flip them so that the slip yoke is at the rear diff because that part of the DS is stronger and thats the area where it can get hit on rocks. Then some will argue that they like to keep their slip yokes out of the mud, (which my whole truck goes under the mud so that doesn't hold up in court) and you really can't kill a yota slip yoke very easy, and the ext cab trucks with 2 piece DS all came that way from the factory…….Soooooo as far as it making any difference in any other ways…. Nope!

 

Wow...so it really doesn't matter huh? That's weird...but I guess good for me. Thanks!

 

It is important that the slip yoke is inserted into the splines so that the yokes of both the u joints are exactly in the same plane.

 

And that the bolts are in place before driving.

I kid, I kid, I joke!

 

"Phase" is the word of the day...

So hopefully the OP didn't separate at the splines. If so, it may be necessary, and I recommend, to let a driveline shop check for correct phasing of the joints. It's not always "line up the yokes" from what I've been told and seen. Granted it works for the majority, but it can depend on pinion and flange angles, and joint style and size.

 

I didn't take the shaft apart...let the shop do all the "hard" work I still have the same problems I had before though...thought for sure it was the driveshaft causing my vibration/rumbling/humming. After I took the shaft off I drove around in 4 hi for a while and the noise was completely gone. Got the shaft serviced, put it back on, same problems what else could it be?

 

Check the play of the diff pinion and trans outputs for excessive play.
Push up on the back of the trans and see if the transmount is good.

 

slipyolk tward rear

 

definitely from t-case back. check output shaft and pinion shaft. probaly the pinion, but could be as deep as the carrier bearings or spider gears. probally not the axle bearings. i would think you would still hear them with or with out the d-shaft in .