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??