1 Ton, 2005 GMC Savana 3500 cargo van, single rear wheel the vin # is 1GTHG35U951145518 we know it is 3.73 ratio 9.75 ring gear. Rear end locked up, so we are trying to find one to fit and need the RPO code. The van is 500 miles away so we can not check it for the code. How can we be sure we have the proper size rear end to fit our vehicle. Does anyone know how to read the vin # to get the RPO code please?

 

Try Compnine VIN Decoder, $5 for 5 VIN's, it's pretty good: https://www.compnine.com/signup.php

 

HELLO....did you spring for the 5 bucks and get your code?????

 

I have this subscription, here you go:
GT4 AXLE,REAR,3.73 RATIO 3.73R(GT4)
It's not a G80.
I have one such rear-end for sale in So Cal area if you're interested for $500. Can ship on a pallet.