<img src="/forums/images/graemlins/confused.gif" alt="" />Do you have a repair manual for the truck?The 2 things I would check would be the proportioning valve adjustment and the rear drum brake adjustment.You may not be getting a lot of fluid to the rear brakes because the valve is closed off,not allowing fluid to the rear.Also,there's a small inspection plug near the bleed valve on the rear wheel.Pull this off and shine a light in the hole.You will see the teeth on the adjustment wheel.Take a small flathead screwdriver and push the gear teeth upward.Keep checking the play in the wheel your adjusting.When you feel the wheel start to drag,your done with that side.Then check the other.The lspv has an adjustment attached on the diff.pumpkin.You want it adjusted up.Hope this helps you out!Good luck! <img src="/forums/images/graemlins/cheers.gif" alt="" />