Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello I will help you with your question,
If you can tell me all the codes from the RPO sticker in your glove compartment that begin with "G" I can tell you what the axle ratio was when the truck was built.
GT4 indicates a 3.73 rear axle ratio
Please let me know if you have further questions
Glad to help and thank you for using JA!!