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Bought 1990 379 out of California. Got it shipped home and found out it’s an aluminum frame chassis. How would a man go about putting a steel dump bed and pintle hitch on this? It look like a factory day cab. Has 10&1/2 inch c channel looking frame. It’s 1/2 inch thick. Some pics would be nice if anyone has something like this. Thanks Tony
 

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Far and away, the majority of the trucks that you see done up like this nowadays are for no legitimate technical reason. It's the in thing in big truck customizing at the moment, same with the super tall straight stacks. That isn't all of them, but the SUPER long stretch trucks, it's looks. There's a well known one named "Project 350" that is a 350" WB Pete same model as the one in the pic. Guy works the truck all the time Showbox jiofi.local.html tplinklogin and puts it in surprisingly small areas, they do look bad *** and if you can drive it why not? All depends on what kind of hauling you do.
 

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The outside width of the frame is the same as a steel frame so any standard dump box will fit, you just drill the rear to anchor the back and construct a slightly narrower crossmember for the rear than a steel frame would have.

The frame will require someone with aluminum welding skills to square it if it was a 5th wheel before but after that is done the rest is the same.

If it will be a transfer truck you use hardened wood between the subframe and the truck frame milled to whatever thickness is needed to index with the trailer horns, if it will not be a transfer you can use a 1x4 hardened piece or even a strip of industrial rubber between them (you want something to slow corrosion).

The rest of the box forward of the rear bolted mount can be secured with the old school U-bolts under the frame or you can fabricate pinch clamps (my preferred method); but it must not be bolted rigid like the rear or the frame flex will crack the frame.

AS long as the rear crossmember is built to be structurally sufficient to pull a trailer that aluminum frame will work just as well as a steel frame.

Good luck!
 
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