i notice this year after putting a long patch of rubber down that i only leave 2 strips for a short duration (10 ft or so) then only 1 tire continues to spin.last year it seemed to spin both tires for alot longer. is this caused from something worn in the rear end or is it normal? im in the process right now of replacing the clutch because i noticed it slipping a bit when goin through the gears so i thought while its up in the air maybe a good idea to look into differential problem. the car is basically stock, only mods done were exhaust and cold air intake.
thanx in advance

 

I am no expert by any means, but I would suspect after beating on your car for quite awhile, limited slip is wearing down. Congrats!