GM-GMC: Chevy trans, chevy dually, specialist shop

Question
I have a chevy dually RV 1993 auto transmission that won't shift out of 1st gear. Any ideas?  Thanks, Greg

Answer
I am not good w/ transmission issues so I really can't help in this situation. I would suggest taking it to a transmission specialist shop. Sometimes they will look at it in the parking lot at no cost. I would call them first.

I can check on recalls if you give me the vin.