My early 97 has a rotoflex.

 

My 99 D1 has all 4 ujoints (6 now) but no rotoflex

 

precision 344 are nice u joints..just got all four...any pointers for me...im tackling this job in stages on thursday...ill do the front first in the morning...go eat lunch with the fam...tackle the rear while i wait for dinner at the moms....im getting a u joint press so it should go smoothly...today...they didnt vibrate much at all...they are driving me nuts..prolly cause it dropped down to 30degrees and the grease is really thick in there now

 

Just make sure grease comes out of all 4 caps is the best advice I can give. Sometimes they need a little messin with to get them centered properly to get grease to flow corectly.

 

Mark everything so you get them clocked right for install. I would mark the flanges as well. You will need to roll the truck back and forth to get to all of the bolts and your flanges will get out of sync with a shaft pulled. Make sure everything goes back in the way it came out.

 

right now..the u joints that are in the vehicle..there is only one that grease is coming out of the u joint

 

Pay special attention to what OK said about marking everything to ensure proper clocking on reassembly.

 

Well...i just replaced all u joints...had a shop do it..now i got vibrations all the time instead of 20-30 60-65mph....i wonder if they put the shaft 180 out....

http://www.toddcosuspensions.com/larodrshsp.html would this help

 

Your best bet is to get the driveshaft rebalanced. I dont think that a spacer is gonna do to much to get rid of the vibe.

 

Honestly..i think its a pinion angle issue...i think the HD springs lifted me waaaaaay to high...im running 36" on the front and 35" in the back with 235/70/16 tires..from the ground to fender...it was about 31" all around before...so i basically got two choices...cut the HD springs down where I get 34" all around (since my stock suspension sagged about 1") or put the stockers back in and call it good....im not about to spend another 500 for castor arms...just not in the budget at all