Vibration from my BJ40 1978 (1 Viewer)

[Robert Quartarone]

I put a 2.5 lift kit in and also purchased 6 degree wedges for the front and rear axle.
The cruiser vibrates until I get to 80 KM. Can some one help!!!!!

 

[lostmarbles]

Are your drive shaft yokes in phase correctly?

 

[77mustard40]

Use your phone or an angle finder to check to see that the angle of the pinion is the same as the angle of the TC output flange. Your shim requirement should correct for any difference. I had to go with a 2* shim when I went from stock to a 2.5 OME. 6* seems like a lot of shim for that lift.

Measure first, then shim to correct the angles, good luck.

 

[shawnfj40]

I have had many 2.5 lifts that did not require shims at all. If you are running stock length shackles I would just remove the shims and give it a try.

 

[Robert Quartarone]

Thank you, ShawnFJ4o,77Mustard40 and loatmarbles.
I found the problem I think. When I had the extra leaf spring installed with the shims he put the shims in backwards.
So the thick part is to face the transforcase, he had it facing the rear bumper.
I'm called today and it will be reverced on Monday (hope).
I will post to let you know the out come. Thank you again.....

Robert

 

[Robert Quartarone]

Ok, he turn the read shim so the thick end was faceing the transfercase.
Now the curiser is all over the road a the vibration is worse !!!!!

HELP !!!!!!!

 

[Robert Quartarone]

Lostmarbels, the u joints do line up.......

 

[lostmarbles]

I try to avoid getting into discussions on lifts and wedge shims because I've never been directly involved in either...

But it's nice to know at least that your drive-shaft yokes are correctly in phase for both front and rear.

Some good photos of your front and rear driveshaft angles may prompt input from those that can help you perhaps

 

[JohnnyC]

Pinion needs to be parellel with the ground... X2 pics of the shafts and axle

 

[shawnfj40]

Ok one more try. Remove the shims and check your alignment ( use Stanley to help). 2.5 inches might not need any correction if you are running stock length shackles. Many spring manufacturers are moving the alignment pin when they make a longer than stock spring. It makes up for most of the changes to drive line misalignment. Also make sure for that reason that your springs are in the right direction and not flipped around.

 

[Robert Quartarone]

I want to thank you all for your help and great advice. I took the shim out of the rear and turned the front shim around.
The BJ rides and steers like a new car......
There is a FREE app. on your iphone the help me a lot.
You use your iphone to check 3 points on the drive line to see if it is correct.
The app. is TREMEC......

Thank you again.........

 

[78fj40mg]

Here's how TREMEC works:

 

[Robert Quartarone]

You have to love technology !!!!!!

 

[shawnfj40]

Congrats!

 

[Robert Quartarone]

Thank you you guy's are great......