Is the frame/chassis on a 94 g30 van the same as the 94 or 93 1ton trucks?

that is what i found a 93 4x4 1 ton chassis, do you think it will fit the 94 g30 van to add front drive axles?

It just might. I've put stranger combinations together. If you want to be certain, get your tape measure out. No better way than that. I would, however, expect the k-member for the g30 chassis to need to be moved to the 1-ton chassis if the 1-ton is a Silverado/sierra. That should just be bolted in with no possible alignment.

thank you, what state are you in? would you be able to do this work?

In California. You might save some cash welding in the spring perches for the leaf springs and cutting out all the independent front suspension stuff. Also make sure you use the rear differential from the 4wd donor