thing is the u joint wasnt worn out, i had it out all of last august thru october after i replaced my transmission and i inspected the joint and put a bit of grease in the caps before i re installed the front driveshaft. it worked fine all winter got stuck twice, and used 4 hi while plowing all winter and never had a problem until thiss summer when the steel vacuum lines that go to the cad unit rotted out, which cause the cad unit to stay locked, which kept the driveshaft spinning, which caused the u joint to then fail.

 

all the posi lock does is replace the vac lines you will hav to pull the lever in the floor and pull the posi lock lever out to lock the front axle in 4wd when your not using 4wd you push the posi lock lever in to unlock the axle and you will get bout .5 mpg better

http://www.spike.com/full-episodes/2...eason-3-ep-523

here watch this link

 

Just watched the video that psychokenny posted, and from 10 mins- 12 mins or so he said that newer model trucks have a "live axle" meaning that the front axle is always turning even in 2wd. Yes it causes drag and worse mpg but that does not matter to me with this truck. That being said if the newer model trucks front axles are always turning why would it not be OK if the front axle on mine was always turning? obviously the designers try to make trucks better every year so why then would they make the front axle in newer truck to where they always turn if that "caused the "u-joints to wear out"? just trying to figure this out??

 

new trucks that have "live axles" use cv shafts for the drive shafts, where the joints are encased in grease all the time, unless the boot rips. whereas a solid front axle like ours uses a standard slip joint drive shaft it needs to be cared for, and by permanently locking the axle shafts into 4wd mode you run the chance of what happened to me, and it wasnt fun at all.

 

So what exactly happened to you redneck ram? i cant tell from the pictures, in the pics the drive shaft looks fine?

 

Guess what? Your rear driveshaft has u-joints and spins all the time, as does your front axle shafts. My truck is live front axle and it has a U-joint front driveshaft. Your's were due to fail or your front pinion angle is effed up.

 

yes the rear shaft spins all the time, but the front axle/4wd is only supposed to be used in slippery situations. running 4wd on drive pavement will do just what happened to me, failed u-joints and a destroyed front axle.

my truck is only lifted 2" so pinion angle is not a problem. as i said previously the u-joints in the front driveshaft were fine as i just checked them a few months ago when i reinstalled the driveshaft after i replaced my transmission. my cad unit got stuck locked in due to rotted out vac lines and i was driving around like that for a few weeks, as i didnt realize they were rotted out.

 

Exactly so i dont see the problem with the front axle always spinning if the transfer case is not in 4wd on dry pavement?

 

If the T-case is in 2wd IT DOESN'T MATTER, the front and rear axles are NOT locked together, the only thing that results from a locked CAD is a live front axle that will spin the front driveshaft! Your u-joints were destined to fail or your pinion angle is bad, period.

 

ok im not arguing with anyone on here, im just telling you what i know, and what ive been told by a very reputable heavy truck shop/ drive shaft shop. i know it was good, and no because of the cad unit it destroyed the u joint and then destroyed the shaft.

do what you want its your truck, but dont come crying when the same thing happens to you.