Why Tire Size is Important

Question: I have a 1992 4WD GMC Sierra.  The transmission gets stuck in neutral and reverse when it is backed up with transmission in 4 wheel drive any ideas?Answer: As far as  being stuck in natural or reverse, it shouldn't make any difference to the transmission if it’s in 4WD or not as far as the transmission shifting unless there is a drive line bind like mismatched front and rear gear ratio’s or mismatched tires Not sure what the problem is suggest you verify it has not had any differential work as in one of the differentials being changed and creating a gear ratio difference… then I would check all tires.. should be within ½” overall diameter.Give Scott a call 888-824-2012 once you have check these things he can help you.