There is a Stovebolter rdavid that has/had a 64 4X4 panel or burb with a 4-53 Detroit. I corresponded with him when I was researching a diesel conversion in my 50 3600. He is a nice guy and will probably be gald to share some info. I have not seen him on here in awhile. Do a search for him in the members list and send him a PM if interested. I also saw 3 or 4 videos on youtube of a guy with a 64-66 4X4 with a 4-53. Lots of challenges to a diesel repower. There are whole websites and email/discussion boards about that. One dedictated to the 6.2/6.5/Duramax and a popular yahoo group for the Cummins 4BT. A guy over on oldgmctrucks.com put a Cummins 5.9 Dodge Ram in a 49 3800 1-ton. Cool or what? Good luck.


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