Driveline Problem??

[twodollars]

Pretty sure this is my first post, but been reading for a while. Hope someone out there can help. Truck is an 88 3/4 ton suburban, 6.5 with a banks turbo kit. TH 400 trans, NP208 case. Problem is under hard acceleration i get a sound like a gigantic rathcet clicking from the truck. I can't feel it in the seat or floor, but I am leaning towards a tcase issue. Same noise whether in 2 or 4. U joints are new, driveshaft is new, and it has a newer 14 bolt out back. Any ideas??

 

[Desert Rat]

Do you have auto hubs on the front? Perhaps they are engaging and slipping?

 

[twodollars]

No, the hubs are manual warn's. Might run it by alocal trans shop and see what it sounds like to him. Most likely it will sound like a 1000 dollars or so. But I might get lucky and find an honest guy.....

 

[diesel4me]

might be..

The chain in the transfer case might be stretched out,and slipping over the sprockets under hard acceleration...thats where I'd look first..

 

[Thunder]

Before you take it to the tranny shop crawl under it and pull the cover on the bell housing. Check the flex plate for loose bolts or cracks.

 

[bladwin]

Re-check your u joints, especially if you have any lift. My rear broke and would chatter like that under accel. I had never heard a u joint sound like that before, I thought for sure my rear end was toast.

 

[twodollars]

thanks for the ideas. I will check it out this weekend. And yes, it does have some lift, a six inch superlift kit.