I'm trying to figure out what gears this '81 longbed 4wd came with. I got the VIN JT4RN48D1B0003001, but can't seem to find a VIN decoder that tells me the factory equipment. Below the VIN is a string of numbers - 74514-35151-a, but they look nothing like the axle codes I've seen references for. Any ideas?

It's probably moot since I want 3.07's and I'm quite certain the truck has the usual 3.9/4.1. How hard are those R&P's to find for the front and rear diffs?

 

Why do you wants 3.07s? Going really small tires?
My 81 came with 3.90s

 

been covered many times on how to tell which gears your truck has and it has nothing to do with the vin number.

I'll be nice and post it for you so you don't have to search for it.

 

Diesel swap, no (or minimal) tire upsize.

Thanks, I've seen that and I relayed as much info to the seller as I could. I don't have the truck in front of me and only went by what I could get from the seller on the phone. With that pic as a reference, I interrogated as best as I could but could only get that second string of numbers; he said there was nothing else on the VIN plate (the one in the driver's door) except the VIN and "74514-35151-A".

Oh, derp derp... I went back to Brian's site and read more carefully, that the right plate to look at is on the firewall, not the driver's door. Seller's hard to get a hold of so I'm still hoping someone can make sense of those numbers while I try to call back and have him read the correct plate.