Where can I find the gear ratio

[Sunkadog]

I need to buy a rear end for my girlfriends 86' Jimmy but I need to know what the gear ratio is. Where or how would I be able to find out what the gear ratio is? A receptionist at a salvage yard told me it should be on a sticker in the glove box. I looked and all I seen was the vin number and a lot of 5 digit numbers on the Vehicle Service Identification sticker.

 

[epiphaknee]

Your gear ratio will be defined by an RPO code. The salvage yard receptionist is correct in stating that most Jimmy's RPO codes are located on a sticker in the glove box. Alldata states that the 6th digit of the VIN defines the location of the RPO code label for a 1986 Jimmy. A "U" indicates the location as inside the glove box! Then use the Internet and search RPO code generator or decoder, to determine the ratio.

An easier way is to just call a GM dealer and provide them with the last 8 digits of the VIN and they can tell you what your differential ratio is on the Jimmy.