I'm looking for a way to look up what options my 1973 W100 has. It feels like it has limited slip as it can take off with out spinning tires from a standing stop on a fairly steep dirt trail.
Any advice would be appreciated!

 

Not sure how, if you are asking about VIN checks. You can easily find out if you have a limited slip rear, by jacking up the back, until both rear tires are off of the ground. Then, by hand, spin one. If the other side is spinning the same direction, its limited slip. If its spinning the other direction, its an open rear diff. Hope that helps.

 

Funny I found this post. I was looking for (I think) the same thing. I assume you are NOT looking for a VIN decoder rather a list of 3 digit codes that were most likely on the window sticker or the "plate" on the inside of the hood. Fir instance my plate has YC6SNO FIT PKG WAY:the code and description for the Sno Fiter plow package. Is this what youa re looking for? Did you ever find it?