The VIN plate is located in the forward door pillar on the driver side. Typically it is missing. If you have a title you can get a replacement plate through one of the parts houses and stamp the VIN back in.

Lacking a title and a vin plate the only option for registering your truck (in most states) is to go through a title hearing and get an assigned VIN. I am having to do that for my 54.

Other options are the purchase of a title from another truck (technically illegal), or find the engine number and use that as the VIN number and get a title through one of the out-of-state title companys such as broadway title. That will cost about $150 for your truck.

Good luck