Hey everyone love the site very helpful. I've got a Late 99 F250 with an automatic transmission (4R100). First my problem then my question. Like many others I have read that have my truck I also have the loud rattling noise from under my truck. I have heard it was the TC and some lube shop said it sounds like the turbo but i will leave it in your hands. About a week ago like any normal day I put my truck into reverse and it wouldn't lock in i would have to give it a lil persuasion to get it to move. Next thing you know it has trouble shifting into 3rd. The problem only happens after I run it a little with my chip on. "6 position by superchip" Now I leave the chip off and putt putt every where I go and it works fine but I hate having the power just sleeping in my truck and not using it. Now my question, how would I be better off? Getting a triple disc TC or just saving up for an upgraded transmission? I have the chip K&N cold air intake and 4" magnaflow exhaust. Want to fix this problem before I work on more engine mods. Ex. injectors fuel system etc. Thanks for any help.