ya thats a good idea....i don't know of any out here in ole NH. gonna have to do some research. i need my road runners drive shaft balanced too

 

always a good thing to have a balanced drive line

 

The rubber is there for a reason, its an isolator that keeps from killing joints and bearings... I used to work for Dana and was the head test tech for the Ford Super Duty carrier bearing... Ran all sorts of mud bath tests on the stupid things to recreate the Arizona desert sand. Anyways, its easy to tell when they go bad, it'll have slop, feel like it has sand in it, and in some cases the races will turn blue from heat. Throw the trans in N, throw the rear end on jackstands, and spin the driveshaft a bit... You'll know if its any good still. Did you put the last one on yourself? If so, are you sure you seated the bearing all the way onto the shaft? I've seen a lot of guys leave them a few thousandths short and that leaves a side load on the bearing that will kill them prematurely. If the bearing is still good, your trans is shot most likely, or you have a poorly set up rear end.

 

What do you mean by in phase? im guessing it not......i have a lift so maybe i need to change the angle of the axle??

 

phase is the way the yokes on the ends are lined up. i am not really sure how to explain it but google it. or some one else on here can maybe explain it better.

 

I gotcha. The geomotry of the axle vs the drive shaft. ......im just going to run it till sometihng blows up. why fix wats not broke....i should just trade it for a reg cab 5speed. Thanks for all the imput. i will pull it into the shop and frig with it.

 

this might help has a good pic which may help you

DRIVE LINE PHASING

 

here is a web site that might help with phasing

Driveline 101

hope it helps a bit, it did when i put mine in my rock crawler

 

Well how much are you lifted? Because of the length of the drivetrains in these things, angles don't get out of wack like they do in Jeeps... They do, it just takes a LOT of lift. Phase refers to how the output on the trans aligns with the input of the pinion, 90*, 180*, etc. If you are out of phase at say 30*, it messes with the harmonics of the U-Joints. If it doesn't give you a bad vibration in the cab, it'll wreck the needle bearings and your caps...

 

you don't have to be lifted at all to be out of phase. and being out of phase can damge anything in the drive line. Any car, truck or suv that has a two piece drive shaft can be easily out off phase if someone has ever change U joints or anything.