Truck won't move in forward gears.

[norad848]

Howdy. I've got a 96 GMC Sierra K1500 and it won't move in any forward gears. Reverse seems fine. But in drive it makes a very loud clanking/grinding sound and it gets louder under load and won't move forward. Any thoughts on this issue? Thank you in advance.

 

[racnredneck]

sun shell intrans stripped, or forward sprag broken. in transmission

 

[beardeddummy]

Put it low to test that. I've had a rear end do that also

 

[norad848]

sun shell intrans stripped, or forward sprag broken. in transmission

Put it low to test that. I've had a rear end do that also

It did it in low gear too. I'm getting it ripped out tonight.

 

[racnredneck]

like I said its stripped. needs overhaul. ive done lots of them. upgrade to harden sun shell, new 3-4 clutched, clean out all metal. and replace forward sprag if broken. and probably be ok....

 

[beardeddummy]

Needs more than that if you want it to last.

 

[norad848]

It's gonna get a complete overhaul. It's got a tad over 100K on it. And they weren't exactly easy miles. Thanks for the insight, guys.

 

[norad848]

UPDATE: The transmission guy at work got my trans torn down. 113K on this rebuild and he says it looks like a fresh rebuild. The print on the clutches from the factory was still on them. And only mild heat wear on the 2-3 clutch pack (I think). So now I'm going to look into my t-case (NP243C) and rear end.