Just to put your mind at ease and know that you have fresh tranny fluid, it would be a good idea to drain all the fluids and go with new. 90 weight in the tranny and the rear end are good, you might want to use some Lucas with it. and the brakes can be drained, and with the hoses unhooked so that nothing runs into the wheel cylinders, you can run some alcohol through the sytem to help clean everything out without hurting the system. Rebuild kits for your wheel cylinders are cheap and easy enough to install. It doesn't matter how strong the truck runs, if you can't get it to "Whoa" when you want it to. Good luck and keep at it.
