driveshaft vibrating problem

[fx4superduty33]

i have an 2008 f-250 ccab that i put ona 8" pure lift kit with pmf 8" traction blocks with the traction bars. I also installed pmf's carrier drop bearing bracket for my two piece driveshaft, ive tried adjusting the carrier brcket up and down to try to find the sweet spot, but im getting a vibration kinda like im going over rumble strips when i take of in 1st and 2nd gears only? Any ideas? Could i have a u-joint starting to go? When im going down the eway at 70-75, everything is fine, PLS help, thanks

[norcalstrokin]

It might be your u-joints I had that same thing with mine turns out that they were frozen. It would only happen when I would take off


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[HighOn20s]

Sounds like you still need a shime kit.

[fx4superduty33]

with this bracket, i can adjust it low enough where the front driveshaft could be lower than the rear one, so i doubt that i need more shims, should the 2 driveshafts be parallel to each other, or should the first one of the transfercase be higher than the back one?

[fx4superduty33]

im thinking it might be a u-joint also, my truck has 58,000 miles on her and they r the original ones

[fx4superduty33]

pls help anybody?

[norcalstrokin]

Is there any play in the driveshaft? How's the carrier bearing look?


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[fx4superduty33]

everything seems fine, the truck has 58,000 miles on her, what should the angles of the two driveshafts be, should they be parralel to each other or the front one be at less of an angle than the back one?

[CT Performance, Inc.]

Strait line through the carrier bearing and centered. Whats the U joint operating angle?