Driveshaft Ujoint Failure

[78GMCJIMMY]

I put a 3" Tuff country lift(new springs) on my 78 GMC jimmy about 6 months ago.I replaced the U joints in the rear drive shaft a few months later(they were borderline bad before the lift).The New U joint on the rear shaft is failing at the transfer case after about 2 months of daily driving.Why would the u joint fail so soon?I am only running 33" pro comp X-Terrains.Is there a stronger U joint that will fit a stock driveshaft or should I just go with the Brute force or another heavy duty U joint?Any help is greatly appreciated. thanx David

 

[obijuan]

did you grease it?

 

[78GMCJIMMY]

Yeah I greased it,Of course!

 

[78GMCJIMMY]

bump

 

[Hogback Fabrication]

Spicer u-joints last the longest. When I used to DD my truck (when it had a 4" lift) I went through a set every 18 months or so.

 

[tacoma]

how's the angle?

 

[454k30]

As soon as I saw this I was thinking driveline angle. A k5 rear driveshaft is fairly short to begin with (for a fullsize) and gets quite an angle to it when you install a lift. I would use a spincer joint, or get a custom rear shaft with a cv, or spacer down the crossmember to relieve some of that angle. There are mixed opinions on the spacer process though.

 

[Blue85]

When the angles through the upper and lower joints dont match, the joints get eaten pretty fast. So x3 on how are the angles?