New T- Case ?
 

Well I have a 6" susp. lifted ifs yota, ( 4" pcomp susp. lift, 2" Torsion bar Crank + 2" NWOR rear springs ) and with that amount of lift on my truck, ofcourse my driveline angle was a little perverse, for the T-case out put shaft to take. So I split the angle with 2 cvj's on a Slip yoke Drive shaft. Now I have a pretty bad vibration, which i was assured by the driveline people that it was not their shaft that it had been balanced on a Lathe. So I think the t-case bearing may be bad, and or it could be something worse....so I was thinking of Marlins single case 4.71 for $ 695 ... what do you guys think ? should I just replace the bearing and hope that that fixes it , or start from anew ???

Thanks for your help !!

" Keep on Diggin'"

If the output is bad, you'll be able to feel the play in the output flange. It may just have a loose nut holding it in place. And check the angles of the driveshaft and flanges, they may be off:

http://www.4crawler.com/4x4/CheapTri...l#Measurements

Oh and the vibration happens while on the gas over 55mph , but pretty much stops when I get off the gas. Someone said they could tell if it was either the t-case, diveline or the rear pumpkin, by the above explanation. do you guys know ?

actually I did have a loose output shaft nut , which I tightened and repunched the tab closed, but it still vibrates ...

I see your in the Bay area....I'm in Danville

It could be pinion angle too high. Why? Under load the pinion tips up, so angle gets worse makes things vibrate. Let off the gas, pinion drops, angles get better vibration gets less. Could be the vibration from the misaligned shaft caused the flange nut to back off. With driveline vibes, they may be more than one problem, or actually one problem and one or more symptoms or related problems. You need to fix them all at close to the same time or you will never get rid of the vibrations. Why? Lets say the vibrating shaft looseneed the flange nut. Tighten the nut, vibes still present. So you may decide to replace the t-case, vibes may still be present since the shaft is not aligned properly. Or you may fix the alignment but not replace the t-case. If the t-case output bearing is worn, you can still get vibes because the bearing that wore out (because the nut was loose becuase the shaft was vibrating) is now causing the vibration. So the point is you have to find and fix all the problems associated with the vibration before it'll truly go away.

Sounds like a pinion angle issue to me too.