Topic: Chasing down drivetrain vibration

[69800]

My vibration comes and goes but is worse at around 40 mph. I am lifted a few inches and have ajusted my rearend so the driveline angles are good. but is stll get vibrations but not always. Where do I look next?
thanks

[Snowtoy]

Where are you feeling the vibrations, seat, steering wheel, cab?  When do you feel the vibrations when accelerating, decelerating, or holding steady speed?

[kneedownnate]

Are you sure your tires are properly balanced?  Driveline still has factory weights?  Drivetrain noisy?

[69800 [OP]]

my tires are perfect. The vibration is through the whole truck cab and seat.. not the steering. Some times the truck is smooth and then I go around a few corners and get back on the hiway and the vibration is suddenly very noticable. does not change with accel decel. I can even put in the clutch going down hill and it does not change. My guess is it is driveline or rear end related.

[Phazertwo]

I would bet that your drive shaft is not happy.  What is the angel on your t-case, and what is the angle on your pinion?

PZ

[hilux-1983]

Maybe this info will be helpful      Click on the "tech info" link on the top of the page.  http://www.4xshaft.com/index.html

[69800 [OP]]

I have checked the angle of the tcase and pinion and did how to shim the rear end a bit. but they are  as close to perfect as I can get them. Good articles in 4xshaft. I think I will pull the driveline apart and give her a real good inspection.
thanks all
mark

[kneedownnate]

You don't only feel vibration from a tire being out of balance through the steering wheel.  Just curious, how are you sure they're balanced properly? 

[mtm]

have a look at your gearbox mount. i had a similar sort of thing

[silence007]

from my experience most vibrations go away with higher speed except wheel balance, with the greater speeds approaching fifty five you will get vibrations.  Brakes would be felt when applied, mostly driveline with initial accel or decel from a higher speed.  I have watched shops balance tires wrong, not recheck after applying inside weight before outside, sometimes not even re run it to check balance.

[silence007]

Then again address what ever you just did to your truck before it started, chances are thats your problem.

[geddofab]

i don't know if this will help. i pulled my rear d line the other day and when i put it back. i put the u joints out of phase. i had the same problem as you . so to fix it i just pulled the d line correctly oriented u joints using the slip yolk splines. now its all better

[silence007]

i don't know if this will help. i pulled my rear d line the other day and when i put it back. i put the u joints out of phase. i had the same problem as you . so to fix it i just pulled the d line correctly oriented u joints using the slip yolk splines. now its all better

very good point.

[Snowtoy]

my tires are perfect. The vibration is through the whole truck cab and seat.. not the steering. Some times the truck is smooth and then I go around a few corners and get back on the hiway and the vibration is suddenly very noticable. does not change with accel decel. I can even put in the clutch going down hill and it does not change. My guess is it is driveline or rear end related.

The type of vibrations you are experiencing are usually from out of balance tires.  If the vibrations have just come about recently, you may have thrown a weight or two, or have a separation in one or more of the tires.  The vibrations could also be being made worse through worn out body bushings.

[69800 [OP]]

I will check the phase on the drive line next. I just put my new snow tires on and nothing changed
thanks

[H8PVMNT]

I just swaped my 4 speed for a 5 speed and it rubes on the trans tunnel a bit...  Probably not your problem but it does cause an all speed vibration.

[santa cruz crawler]

make sure you tighten your u bolts real tight

[GreenYoterKrawler]

i don't know if this will help. i pulled my rear d line the other day and when i put it back. i put the u joints out of phase. i had the same problem as you . so to fix it i just pulled the d line correctly oriented u joints using the slip yolk splines. now its all better

X2 on that i did the same, line up the yokes, and get 3-6* shims for the rear if ur pinion angle is even slighty bent

[dt]

I also say yokes out of phase,thats my guess