My 95 2wd crew cab dually seems to shift strange while going down hill it jumps constantly between O/D and drive if you click it out of O/D it is fine any help appreciated

Tom

 

That sounds like your torque converter going in and out of OD. You could do a fluid and filter flush on the tranny, might help. Take it to a tranny shop and have it scanned. Most shops do it for free (they want your biz). Come back here and lets us know what happens. You will get the straight scoop here.