my 1995 chevy 3500 was changeing gears fine until i drove on rough dirt roads. on 1995 Chevrolet 3500 Pickup

now it will not change gears at all. i replaced the speed censer but that didn't fix it. i can't find the fuse for it to change gears to see if it needs replaceing. it acts to me like there is a short and every time i hit a hole in the road the brake light comes on and it quits changing gears.

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You need a scan test ecm, trans. & abs! You say wont shift at all, not even out of low gear?