According to my VIN CE134-ZZ67221
Model ce15934
Options No
G80 Positrac Axle
Z17 Sierra Grande Truck
M49 Turbo Hydra Matuc (yep that is how it is spelt on the plate!)
L47400 CU IN V8 ENGINE
Z84 CUSTOM SPORT TRUCK
2WD Conv Cab
V8 Gas ( Is a factory 402 ) aka 396's bored 30 over
Wideside 127'' LONGBED
Fremont assembly plant
1/2 Tonne

I need to order new crown and pinion, and need to work out what ratio diff I have?

Any help most welcome.

Cheers ,

Johnny (Australia)

 

Check your RPO codes in your glove box. Probably the easiest thing to do is take a picture of
your Service Parts Identification sticker with your phone, then check the RPO codes here on the RPO code
list. It should show which gear ratio, whether 3.42, 3.73, or 4.10.