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A drive shaft off a LWB truck should work. The frames are basically the same. I have a SWB truck and the drive shaft not adding the yoke for the tranny is 57 inches. Do you have a 12 bolt on your truck? If so the 85-87 1/2 ton trucks have 10 bolt rearends. You will need a bastard U joint to bolt up the drive shaft to the 12 bolt. I just replaced mine with NAPA part number 372 in the yellow box. I replaced my original 10 bolt with a 12 bolt. My truck also has the 700R4 combo.
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