LB7: Clunk Letting Off Throttle

[RobsDmax]

On the highway if im cruising at 60 or 70 mph, and i go from a little throttle to letting off throttle completely i notice a small clunk and it only happens sometimes. Would this be the splines that need lubricating on these trucks? that comes from rear of transfer case?? Any ideas

 

[GMC04DURAMAX]

have you checked u-joints? that would be the first place that i would start

 

[RobsDmax]

honestly, i dont know how to check them, lol their is little to no play anywhere in drive shaft?

 

[02duramax]

Drive the vehicle onto dual ramps or have the car raised to gain easier access to u joints.. Move the joint back and forth and up and down and see if there is a lot of play in the joints. If there is movement in the cross itself, replace that u joint. I had to replace the carrier bearing in the middle cause of vibration.. Was less than 50 bucks, Check it out..

 

[bevi]

It deffinatly sounds like something in the drive shaft makes since its under pressure when your in the throttel and when you let off that pressure releases.

 

[RobsDmax]

alright im gonna pull driveshaft and see what the ujoints are like. thanks

 

[bevi]

wouldnt hurt to grease everything while your under their. just a thought

 

[RobsDmax]

ya what would you grease? the slip yoke? pretty sure my ujoints dont have grease fittings... yet lol

 

[bevi]

I just ment anything you can find with a grease fitting. It prob isnt anything to do with your clunk but you never know.

 

[RobsDmax]

ya i will try and see what i can find lol, my front end which is where i assume most grease fittings are is done every oil change. :thumb:

 

[bevi]

should have anything to worry about then just trying to cover some bases. Did you end up getting new rims i had asked a while ago about your h2s.

 

[RobsDmax]

ya me neither im not to worried but maybe u joints need replacing anyways. i haven't but the h2s are off. they still have tires. where are you from

 

[bevi]

New hampshire. due south of you im pretty sure.

 

[RobsDmax]

yes quite a bit lol. honestly i have a feeling shipping would be nuts. i will be in columbus ohio after christmas, if that helps

 

[bevi]

i figured shipping would get me. Not really ohio its a ten hr ride on a good day. Its no big deal was trying to get something diffrent on for winter. Thanks tho

 

[RobsDmax]

ya i can check shipping but it would have to be a skid i guess for 4 rims

 

[RobsDmax]

bump want to see some other opinions