You would need to look but if it's like the old fords there should be a ground behind your tail light assembly. But have you checked your reverse light switch on the tranny? Could also be a short to. How did the wires look when you changed the bulb? Was there some crud in the light socket?
One more thing. Most people don't realize this but usually with the 1156 and 1157 light there is two "prongs" on the side of the light. One is lower then the other. Did you checks to make sure those went on the correct sides in the socket? Yours may or may not have that.
I have the 3157 bulbs so its the plug in kind if that makes sense. Lol
Ill have to open it back up and see the ground situation back there when im changing my plugs tomorrow. I dont reverse much but its bugging me that i bought all new bulb and none of them work. Also sorry for my ignorance but what do you mean by reverse light on the tranny?
I did however get my rear end jacked up finally to start investiating my grinding noise i had in the rear end. It seems its not coming from diff, im going to take the cover off and clean it up and put new oil in tomorrow anyway just to inspect everything in there tomorrow. But it seems to be coming from the driveshaft which is steering me towards the u joints like stated earlier. It is also coming from both rotors but i didnt have enough time to take my wheels off and look at those so im going to add it to the list for tomorrow as well.
To help me clear up the u joint solution, when i had it jacked up i could twist the shaft probably about a half of an inch which seemed like a lot of play so please correct me if im wrong?
Thanks for all your help!