Another option is to find a 1/2 ton front axle and swap it out. Of course you would have a 6 lug frontend after that. [/quote]
If you aren't concerned with complete originality, you can then replace your rear axle./diff. with an S-10 or Colorado rear end- you will have 6 lug wheels all around and a rear ratio that will get you highway speeds if you want. I really like my 3.42 rear- and front disc breaks. Best modification I've done (then you better add seat belts, too)