On my 03 Dodge CTD on the inside of glove box there is a sticker indicating the gear ratio 3. 73 and also has the paint codes for the truck.Originally posted by OnlyCummins
Don't know whether this would apply to Dodge trucks but on GM trucks the glovebox has a decal on the inside of the lid with all/most of the RPO (Regular Production Option) codes. For example: GT4=3. 73 rear axle ratio.