my 66 shortbed gmc parts truck with leaf rearend had a 1 piece i think,,,
atleast it didnt have any driveshaft loop part etc
i dont have the driveshaft from it but maybe you should look for a leafspring truck?
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68 4x4 short fleetside deluxe cab 327 air
56 big window short stepside
64ImpalaSS 68 large journel 327 turbo 350