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Jul 21st, 2025 | | | | Joined: Sep 2005 Posts: 99 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2005 Posts: 99 | What is the difference between these 2? I know what the physical difference is but on my 1.5 ton will I notice any real changes in handling , ride or load carrying ability. I am going to swap out the original and before I go running around to every boneyard around, I want to have some idea as to what I want and why I'm laying on my back under some old truck figuring. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | In order to keep the capacity, you'll need to look for a '60-'72 C40. Thsoe are the only years that GM offered IFS on a 1 1/2 ton truck. The currenty available aftermarket IFs will be far below capacity, as they are based on passenger car designs. You might be able to get away with the '73-'87 truck style, but you'll want to use the 1 ton version, preferrably from a Dually, but there will still be some dimisished capacity.
Bill Burmeister
| | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | GM did offer IFS on 1.5 ton trucks much later than 72. Many P30 chassis came with IFS and a similar 5 and 10 lug bolt pattern to what you may already have? They made these in the 80's for sure, probably even the 90's, and later?? This Tech Tip is geared toward I-beam axles, but there is a very little bit about the different P30 and similar chassis with IFS. http://www.stovebolt.com/techtips/bigbolts/p30swap/Personally I would stick with the I-beam, In my opinion they ride just fine for a truck. Grigg | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Forgot about those P sereis vans, most of those I see around here are 8 lug 1 tons, the bigger ones I've seen had I beams.
I do agree with you, I'd stick with the I beam, too.
Bill Burmeister
| | | | | Joined: May 2005 Posts: 331 'Bolter | | 'Bolter Joined: May 2005 Posts: 331 | I agree with Longbox55. A I beam that is in good shape, king pins, shackles etc. is perfectly fine.
Samantha | | | | | Joined: Jan 2008 Posts: 165 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2008 Posts: 165 | The difference between a IFS and a straight axle is worlds apart in ride, but this comes from tow ton trucks one a 57 Chev the other a 61 GMC with the ifs it rides like a Caddy while the Chev rides like a wagon, but I don't know if it would be worth the work to swap it in. | | |
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