1972 GMC Sierra long bed 2wd to 4wd project(need answers)

[silorss]

I have an all original 120,000 mile truck,its a 1/2 ton long bed.I am wanting to convert it from 2wd to 4wd,but I don't want to remove the cab from the existing frame. 73 - 87 4x4s r plentiful.my question is if I find one can I use 73 to 85 spring hangers front n rear n all 4x4 components and them mount right up ? Any answers woukd b greatly appreciated thanx
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[1mitch4]

don't know about trying the later year stuff. I have been doing some research myself on a 4wd conversion. front springs are shorter on a 72 than a later model. rear springs are wider and frame is wider in that spot I think, putting your spring perches out to wide for your frame.

Scott

[LeftCoast32]

I have a full set of 1972 K5 Blazer Frame Hangers that I will let go cheap, $200.00 plus shipping. They were off a California truck being converted to 2WD so they are in great shape. I was going to convert from the '66 style with grease pins but decided to keep the stock hangers and suspension type.

[sierra4x4]

With some minor modification you can use everything from the front of a 73-87 4x4 to convert yours to 4x4. I have a buddy that has done this. One huge benefit of doing this is you get better motor mounts and the longer front springs are plentiful.