Driveshaft binding at NP208 slip yoke. Need help!!

[BlitzK5]

I just installed a 4" shackle flip, New OEM springs and a 14bolt FF and connected it to my NP208 only to find out that the driveshaft is binding with the slip yoke. Its ok at the 14 bolts yoke though. Anyone run into this problem before and what did you do? I was running a 4" lift before with no problem but now I cant even drive the thing. Need help!!

 

[randy88k5]

Can you measure your pinion angle and transfer case angle? They might be too far apart. Did you extend the shackle length? Its possible the old springs were worn, and the driveshaft fit in good enough. The shackle flip will rotate the pinion a little IIRC.

 

[BlitzK5]

The NP 208 is 4 degrees at the yoke. The 14bolt has 14 degress at the pinion and the driveshaft is at a 24 degrees.

 

[randy88k5]

Well, I hate to say it, but you definately have angle issues. I forget the exact factory max angle difference, but its in the neighborhood of a few degrees. You need to lower your front driveline to match better with the rear. You can lower the transfer case to help relieve some stress. Put some metal box stock inbetween the crossmember and frame. Or you can get some shims to put between the leaf and axle. These are all temporary measures, with the most recommended fix being to reweld the spring perches to get the best driveline angle.

 

[BlitzK5]

Well the thing is that the way its sitting know there is no binding at the pinion, its only at the tranfser case so I dont see how shimming it or moving the spring perches would do anything to the binding at the transfer case. However I will try the dopping of the transfer case 1" to see if it does anything. The only concern about this is that it will now move my front drive shaft angle at the transfer case up causing binding there.
Thanks.

 

[BlitzK5]

Well. I shimmed the axle 4.5 degrees an then dropped the transfer case 1". and this it was I got. Its not binding but it pretty damm close. Will it be ok? Sorry about the big pictures. I dont know how to make them smaller.

 

[PsychoticDeadGuy]

i lowered my trans case 1 1/4" with a 5" lift. it works pretty good.

 

[BlitzK5]

Would'nt your front drive shaft be to short now. I cant even connect mine with the front 4" warn springs I used let alone the extra angle I created when I dropped the transfercase down 1".