Front end vibration when front hubs are locked

Ojb · Post by **Ojb** » Tue Jul 05, 2016 7:21 pm

I have a vibration in my front end when the hubs are locked and the transfercase is in 2wd it goes away when I shift into 4wd or unlock the hubs. I have completely gone through the entire front end and think the problem may be an axle shaft out of balance or possible the Detroit truetrac that I have up front. Just wanted to see if anyone else has come across this before.

PaulW · Post by **PaulW** » Wed Jul 06, 2016 6:00 am

Check the clocking on the crossover U-joint

Post by **SteveG** » Wed Jul 06, 2016 6:24 am

PaulW wrote:Check the clocking on the crossover U-joint

Ditto.

philofab · Post by **philofab** » Wed Jul 06, 2016 7:16 am

Yep. If the u-joints are clocked wrong you will get a smooth left right wobble in the steering wheel.

[youtube]https://youtu.be/T4P75ZQvpws[/youtube]
https://youtu.be/T4P75ZQvpws

This video helps people understand the pulsation that is created from u-joints.

VintageIronFab · Post by **VintageIronFab** » Wed Jul 06, 2016 8:49 pm

How do you insure the u joints are in phase on the pass side??

philofab · Post by **philofab** » Wed Jul 06, 2016 9:52 pm

You need to make sure they are parallel. Same as a driveline.

VintageIronFab · Post by **VintageIronFab** » Wed Jul 06, 2016 10:06 pm

Thx for the info as I have to do this really soon!!

Ojb · Post by **Ojb** » Thu Jul 07, 2016 8:33 pm

They are clocked correctly. I marked them before I took anything apart.

Ojb · Post by **Ojb** » Thu Jul 07, 2016 8:40 pm

They are clocked correctly. I marked them before I took anything apart.

Tchajagos · Post by **Tchajagos** » Thu Jul 07, 2016 9:44 pm

How fast are you going when it vibrates?

Ojb · Post by **Ojb** » Thu Jul 07, 2016 10:16 pm

The vibration starts around 25-30 mph. I plan on having both front axle shafts balanced when I have it apart for the coilover swap. I do think it's either the axles or the differential, just wondering if anyone else has come across this before.

Ojb · Post by **Ojb** » Thu Jul 07, 2016 10:17 pm

It's coming a parts this weekend and am hoping to fix the problem while its apart.

Tchajagos · Post by **Tchajagos** » Fri Jul 08, 2016 2:37 am

It's just weird that it's there when you are in 2wd with hubs locked but it goes away when you are in 4wd with hubs locked. It might very well be a bad u joint or maybe the gears were not set up correctly in the third member.

Ojb · Post by **Ojb** » Fri Jul 08, 2016 7:28 pm

Thanks for the input guys

philofab · Post by **philofab** » Sat Jul 09, 2016 9:40 am

The driveline could possible cause this...