feel the vibrations

[red dirt squirt]

ok so i finished the lift on the cruiser and im feeling vibrations from the back. they occur approximately mid way to the top of third gear . the vibrations increase in severity at the very top of third gear then when i shift to fourth immediatly stop. im stumped on this one because im very confidant that my drive shaft andgle is sufficient and that its straight......my mechanic mention a third gear bearing in the trasmission and im hoping thats not the case.....id rather it just be the driveshaft.......it ran well before i lifted it! see what ya think, all inqueries appreciated

 

[peesalot]

mine does that but I just let it roll. 3 years now and had extra driveline built waiting for this thing to lose it, has not happened . I figure the stock splines in the slip cause it as mine has persisted thru a tranny rebuild and a new t-case , new springs , bushings and third member , so I guess they just eggbeat a little , I plan on getting custom cv shaft from drive line solutions to solve.
BTW The other stock driveline I had lengthened and new Toyota u-joints put in did the
same thing , even worse at certain speeds .

 

[82-SOA-60]

Did you have the driveline off at anytime while installing the lift? If so your driveline may have been put back on out of phase. Just my .02

 

[nhfj40]

I had a problem similar to this after I had my drive shft out to change the tranny. to fix it I pulled the 4 nuts off of the parking break housing that hold the drive shaft flipped the drive shaft and bolted it back in. it drove nice and smoothafter that I think that is what you call in or out of phase.

 

[too tall]

out of phase means when the yoke isn't aligned properly.if you look down the length of the shaft the two ujoints should line up with each other .

 

[red dirt squirt]

yeah i never removed the driveshaft throughout the lift process and all i did was basically put bigger leaf springs on lengthen the brake lines and restore the driveshaft angle to its previous position with the 4 degree shim......i am still using the stock driveshaft.....any recommendations on how to get the shaft back into phase?

 

[CruisinGA]

4 degree shim is probably too strong. Try a 2.

Are you sure the shim is installed correctly? For the rear axle it should be fat side facing rearward.

 

[lowtideride]

if the 2degree shim doesnt work it sounds like you could use some new U-joints......ok back to the 60 board....

 

[red dirt squirt]

hmmm....well im positive the shim is installed correctly, and it doesn't appear to be overkill as the shaft and differential housing are linear.

 

[red dirt squirt]

u joints have no play in them