just a heads up theres the Old GMC truck website were you will find enormous amounts of info on these blue chip trucks and the hydro is one of our favorites over there.
as for your truck.. you will need the hydro crossmember which is not the same as a chevy hydro crossmember and on the inside of each frame member is the flanges, rivited to the inside of the frame that the hydro crossmember bolts up to. youl need them.
and the steering column
and the nuetral safety switches on the firewall above the steering colums .
good idea to run the 307 spicer 45 rear becuse the 392 rear will make the tranny shift very quickly from first to second and into 3rd.
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