rough shifts, wierd noises. HELP ME!!!

[seth999]

it may be the factory locker in the rear end if th noise is coming from there they have problems sometimes if they have been beat on

[Duramax LB7]

I would inspect your u joints, that may possibly be the problem. You might have to undo the drive shaft to get a good inspection of the ujoint.

[maxxflip]

Originally Posted by 02CoalRoller

So trucks going to the shop tomorrow to get looked at- Me and a few of my buddies tried looking underneath the truck when it makes the "clank" noise. It looked like the rear axle dips forward when it makes the noise. Does anyone think it can be bad leaf bushings? Ideas please!

X2 on the fuel filter preventing the WOT shift
as far as the clunk are all the suspention bolts tight u-bolts etc?

[treyfox11]

the trannys do have some sort of a clunk from the factory not bad though you sure its just not the tranny going into gear??

[seth999]

if you dont know when the last service was i would go ahead and do the oil tranny fluid and both spin ons

[02CoalRoller]

Im going to check that out when I leave work and get it in the garage. I want to inspect the leaf bushings too. You guys are a huge help, any other ideas?? (besides selling the truck)

[frankrotella]

I have a 2003 silverado diesel with a allison suncoast trans. When I have to brake hard without giving the tranny time to downshift I get a hard bang, almost feels like I'm being rear ended!! Had everything checked and re flashed, Still having problem, any sugestions?

[02CoalRoller]

SAME HERE! Have you checked your leaf spring bushings?

[frankrotella]

The whole suspension was checked, I was told if it's the suspension it would prob. happen all of the time. My problem is intermittent

[02CoalRoller]

I think its the infamous gm slip yoke clunk. The fix: nickel plated slip yoke. If that doesn't work... anyone wanna buy an LB7 dually??? just kidding haha