Hey Gus
You can tub a truck fairly cheap,if you know a good fab guy.I am currently tubbing my 75 luv.It will have 15x12 weld rodlites,with 31x16.5x15 et streets.The rear is a 9" .I had a friend narrow the housing for me.Sent the axles to Mosier engeneering.For $189.00 they cut my axles ,resplined them "31" and restuded them to a smaller bolt patteren.as far as cost it all depends on what you want.My rear suspension is going to be a homemade set of lift bars .......cheap cheap cheap.Hope this helps.