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Wheel base  is different, IIRC, 109" vs 115". Otherwise they are real close, mainly the lack of the extra body mounts. and the fuel tannk location.

FYI, you can use a ramcharger/ trailduster from from 74 to 93. the 80's and 90 you will have to move the frame cross member that holds the transmission. If you have a big block engine, the 88 to 93 frames will not have the place to mount the engine. I think it is a matter of drilling, but not positive.

The 81 to 93 frame, will also require a 3" body lift puck in position right behind the front seats. otherwise a bolt on fit.
 

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You can "section" the shortbed frame, i.e., take out the 6" from in front of the front spring hanger for the rear springs - done it twice now to get the 3/4 ton frame under an RC - if you know the business end of a welder you're on the right track.
 

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A shortbed frame isn't as beefy as a 4x4 longbed.  If going to the trouble, pick a stronger one like fenrir suggests :)
 

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I have a ‘75 TD that had a busted up frame too. It was cracked everywhere and welded poorly to repair some areas(that’s how I bought it). I used a ‘92 W250 frame. Single cab, Cummins. I had 25” cut out and then plated back together.  RC/TD is 106” WB and a single cab long bed is 131”.  TD dropped on like it was meant to be there. The later first gen frames are the best of the 72-93 vintage, unless it’s a W400 cab and chassis. Those are the tallest and thickest I’ve run across so far. Taller rails, and thicker gauge steel in the late first gens. PM me your number. I can send some pics to your phone. I can’t get pics to load on here.
 
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