Oland, Do a search, this topic has been covered here. I helped change the pumpkin in Old Car Kook's 51 GMC 3/4 ton from a 4:56 to a 4:11 . The 4:11 came from a 72 3/4 ton. He bought the chuck from Tom Myers Truck Parts in Oklahoma 918 542 3871. It was a direct bolt in.

Kook posted some pics here on the page of the conversion. If you can't find the pics , E mail him at [email protected] ..

Bill M
53 GMC Hydra-Matic

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