Another "truck pulls to the left after alignment" thread, need advice please!

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Ok well it is my dd so I’m thinking of things I can do in my garage before having to pull the diff. What about just checking bearing preload? I have an inch-pound torque wrench.
 

landtank

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I’ve been thinking on this and I might have an idea how to check this out if the bearing is really bad.

Now chock the front wheels with something large preferably wheel chocks at the front of the tire and drive up against them.

The idea is to load up the pinion and force any play in toward the outer bearing.

Then set the e- brake and place the transmission in park.

The crawl under and see if there is any play in the companion flange.
 
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I’ve been thinking on this and I might have an idea how to check this out if the bearing is really bad.

Now chock the front wheels with something large preferably wheel chocks at the front of the tire and drive up against them.

The idea is to load up the pinion and force any play in toward the outer bearing.

Then set the e- brake and place the transmission in park.

The crawl under and see if there is any play in the companion flange.
Excellent! I understand completely and will try this tomorrow. I also have a buddy coming over with new 31'' street tires im going to swap on mine and drive to see if it is my tires.

I guess I dont want to, or didn't plan on messing with the front axle or tcase as part of a lift.

One thing I will mention, as just another point of reference, is that on the freeway, at 60+ mph, when I am by myself, I can look over and see the passenger seat vibrating.:meh:
 

landtank

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looking forward to your findings. I was thinking that if you have some ramps, they might work better. You could remove the rear drive shaft, lock the center diff and then drive up the ramps part way and place the tranny in park. The truck would then roll back slightly and rest with the front axle holding it in position on the slope of the ramp.
 
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looking forward to your findings. I was thinking that if you have some ramps, they might work better. You could remove the rear drive shaft, lock the center diff and then drive up the ramps part way and place the tranny in park. The truck would then roll back slightly and rest with the front axle holding it in position on the slope of the ramp.
...at which point i would then crawl under and rotate the front shaft, feeling for play?
 

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...at which point i would then crawl under and rotate the front shaft, feeling for play?
you won't be able to rotate it but what you are looking for is up and down play. And there will likely no be much at all even if it's bad. Place your dominant hand on the drive shaft just behind the u-joint and your other hand partially on the diff and fingers on the pinion dust cover. Then attempt to move the shaft up and down while concentrating on your hand that's on the diff for any movement.
 
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you won't be able to rotate it but what you are looking for is up and down play. And there will likely no be much at all even if it's bad. Place your dominant hand on the drive shaft just behind the u-joint and your other hand partially on the diff and fingers on the pinion dust cover. Then attempt to move the shaft up and down while concentrating on your hand that's on the diff for any movement.
Roger that. thanks
 
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Update.
So today I tried the suggestion by Rick to feel for play in the pinion bearing and with all my might, I could not budge the flange even a smidge.
Also swapped over a buddies new 31” less aggressive tires and although they were quieter and seems to wander less, the vibration was unchanged at 50mph. So it is not my tires.
Also while the front was jacked up I checked the wheel bearings and calipers. All was good.
So I guess that means it is still a vibrating front shaft. But it is not the shaft itself, because at this point I have tried 4 different shafts. So it is a driveline angle, or a bent axle shaft or worn spindle or something in the front axle. Or front tcase bearing.
Any other ideas?
DB205E27-EDA9-499C-9751-1E9F83AB808A.jpeg
872A8D38-B9E6-4CD1-84AE-22FBFD3BC103.jpeg
 
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Update.
So today I tried the suggestion by Rick to feel for play in the pinion bearing and with all my might, I could not budge the flange even a smidge.
Also swapped over a buddies new 31” less aggressive tires and although they were quieter and seems to wander less, the vibration was unchanged at 50mph. So it is not my tires.
Also while the front was jacked up I checked the wheel bearings and calipers. All was good.
So I guess that means it is still a vibrating front shaft. But it is not the shaft itself, because at this point I have tried 4 different shafts. So it is a driveline angle, or a bent axle shaft or worn spindle or something in the front axle. Or front tcase bearing.
Any other ideas?
I think this might've been suggested already, but did you check the height of the greasiness on your knuckles?
If it's under halfway then the spindle bushings may not be getting lubed, and cause a vibration.

Edit: Not entirely sure, but looking at pics on page 2 I think it's high enough.
 
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