Jeff, I'm looking into upgrading to the 14 bolt rear under my 72. From what I've heard, it's about as bolt in as can be with the GM 52" springs. Is this truly an afternoon parts swap fest, or is there some modification, fab or welding required? I don't want to assume its this easy and then have my truck down for a month in my garage because there's a really important, time consuming step involved.
Also, I'm still interested in a pair of those front spring mounts for the front springs. My l/f is bent and the truck doesn't sit right because of it.
Ps: late model GM tahoe/suburban running boards fit nicely!
I don't know if I'd call it an afternoon job. I did have to replace the spring perch's as they were not in the right location. Also when used in conjunction with GM springs the springs had to have the bushings replaced with IH spring bushings so that the same hardware could be used. Also with the spring perch's they need to be the kind we sell with the three centerpin holes as the axle does need to get moved back an inch to look correct in the wheel wells. New ubolts are needed as GM 14bolt rear ends have larger axle tubes than a Dana 60. I didn't reuse any of the IH ubolts or plates so custom shock mounts had to be fabricated.
Still working on those front plates. I apologize that I haven't gotten to it yet. It's still on my to do list.
Edit - front plates are now available - CPT - Crawler Proven Technology GM spring hanger to IH pickup or Travelall - IH Parts America
Last edited:

what about the driveshaft? Will it be long enough and what about the u-joint?