I have a Gmc style 9434. What style Chevrolet will be the same?:o

What parts are you looking to interchange? Many of them it doesn't matter as long as it is not more than a 1 ton chassis. Fenders, cabs, beds, doors and lots more are all the same until 1.5 ton.

Hey Jebb.
The shop and factory assembly manual i got is for Chevy so i wondered if Gmc 9400 series is the same as Chevy 3800 series?
Frame lenghts,wheelbase....

I can't swear by anything, I have the same manual as you. I would have to say that I have never heard of a different wheel base on a short bed. There are exeptions in the wheel base of the bigger trucks (like my Flat Bed) but I am almost sure near everything from a short bed Chevy should interchange.