Such records are not made available to the public, nor should they be.
Contact you local GM dealer.
If it's an original engine, call a GM dealership and give them the VIN number.
In GM trucks or new GM cars, the 8th digit of the VIN # is the Engine.
If you call your local GM dealer with the VIN off of the truck they will check for any open recalls.
It's not. Call a GM dealership, tell them your VIN #, and they can tell you the gear ratio it came with from factory.
Vin Plate
NO, It is different.
There'll be a panel inside the door frame which has the VIN number on it. The VIN will also be on the truck's registration.
The eighth digit of the vin number is the engine code.
none
All you need to do is write the VIN# down and call a GM dealer and ask for parts. Tell them you would like to know the gear ratio in you truck, and that you have the VIN# Thay will tell you what it is.
Call a GM dealership and have the VIN handy.