[rollin thunder]

Originally Posted by geezer#99

Here’s a big list of rpo codes.
You might find what you need in there.

https://www.marshu.com/images-websit...-car-codes.pdf

Your original tire size could have been 195 75 15’s. My old 84 had that size originally.

That’s a good list. It doesn’t show 195/75r15 but it also doesn’t have those rpo codes. coyote’s Theory of rear and front tire size seems to hold water because the sequence of the rpo codes they do have match with front and rear tire size.

But I wonder what the standard rear end gear ratio was. In this list the rpo for a 2.73 is GS1 among several others but GQ1 is the only standard ratio line it seems. And it doesn’t actually give a ratio. If 2.73 was standard why bother giving it several othe rpo codes?