I believe mine is a 5.12 or 5.13 rear but I get passed by semi trucks when pulling away from a light. I don't know how quick these trucks are meant to be as i've never driven another one. But it seems like it should be faster. What do you guys think?

I have a lot of interests in old machinery and electronics. My parents bought me a 1949 GMC 1 ton 9 foot bed project truck for my 11 birthday and I've loved it ever since.