Topic: VIBRATIONS IN THE FRONT!!

[solidmaui78]

My truck vibrates and shutters hard in the front when my hubs are locked and in 4WD... but not when the hubs are unlocked and in 4WD.../?? Can someone please help?

[madmax866]

Unbalanced front drive shaft probably

[blackdiamond]

If you're talking about speeds above 30 mph in a truck with aftermarket parts (i.e. lift kit) then it's likely that your front driveshaft does not have the proper angles to run smoothly.

I just read your question again and the above may not specifically apply; however, when the hubs are locked the driveshaft is loaded and will have different "vibration" characteristics.

What speeds are you talking about?  Are you talking about on dirt or pavement or both?

If you have a locker you could try locking one hub at a time to see what happens.

What type of truck?

[solidmaui78 [OP]]

I have a 94 toy with 4in all pro and tru trac front detroit rear with 5.29 yukon front and back just got the drive shaft done with the all pro drive shaft kit and it should be close to balanced it was made and welded on a lathe by my machinist uncle....
 

[solidmaui78 [OP]]

speeds around 10-20 on or off the pavement has the same vibration... it crawls fine at low speeds like 1mph lol

[79coyotefrg]

can you get a picture of the front driveshaft where it mounts to the diff??

[808]

yeah depending on  how steep the angle is makes a huge difference, on mine with the 4in marlin springs i had massive vibration. i bet if you are in 2wd and lock your hubs you will get the same thing too. so go high pinion or stacked cases