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Re: 1978 3/4 ton to 1970 3/4 ton axle swap question
In the front, I swapped in a Corporate out of a mid 80's GM diesel. No problems there. The rear had an HO52 in it, and I've swapped it for a 14 bolt FF out of a 90's square body 1 ton. It bolted right in other than the shock mounts. My '69 had both shocks facing forward, and the newer style is staggered. I would have preferred to stagger them, but my rear mount tank didn't give me that option.
As far as needed parts, definitely go for new U bolts, and you might want to verify that the U joint styles are the same. It seems like the rear is different on the newer style, but I'm not positive.
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