i just bought a 88' T-Bird w/ worked 5.0 & P225x60R16 tires on all 4. everytime i burnout i left 2 lines. So i put bigger tires on the rear 245x50R16ZR goodyear GS-C. today i did a burnout and only the right tire left a mark. it sounds fine i dont think its broke. prior to doing it when the back was jacked up i turn one rear wheel and they both turned in the same direction. i was pumped i thought i had a posi.any help out there i know thes cars are similer to mustangs. is bad,on its way or is this normal