here are some pics of JonsGotaDusta's 40 ply truck that we set up with air bags front and rear. this is a toyota PU chassis but the same rule apply to what you want to do.
he stole from me a 4 bar setup I had around here and we made brakets to use with the stock toyota rearend
we still need to make upper shock mounts but the rear is all finished.
you can get a rear 4 bar setup pretty cheap on ebay
for around $225.00 and use any rear you would like.
http://www.ebay.com/itm/05-Triangulated-...b19&vxp=mtror just the bars for $168.00
http://www.ebay.com/itm/Four-Bar-Suspens...=item19da52f240if the front is coils just replace then with bags
I would think there are cheaper brake setups available for a 50 ford, I would check around and maybe ask on the hamb for inexpensive brake setups
Ron
anyway here are the pic of Jon's truck...
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UP