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Old 07-21-2003, 01:53 PM
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Question c-4/flathead/rear end combo question

I am no longer able to drive my '51 F-1 with the original 4 spd non-synchro tranny. I know the c-4 is a popular option. I am confused by the "open drive rear end" requirement though. What exactly does that statement mean? I know many local trucks that went with the c-4 but used the stock rear end. And one other question, one of the more popular kits from Speedway Motors comes with a 12 Volt Neg Grd Starter. In a nutshell, what would be required to be changed to go with this system? I am thinking seriously it would be better...
Thanks in advance!!

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Old 07-21-2003, 05:28 PM
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I may be wrong, and if so, someone will very quickly point that out, but believe that the Open Drive refers to not an enclosed drive shaft as was common on some earlier vehicles.
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Old 07-21-2003, 06:28 PM
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Not a problem...........

Your 51 has a 'open driveline'. As AdtKart pointed out.......closed driveline means that the driveshaft runs insude a torque tube ( early Fords up to 48 passenger cars amd pickups up to 46 -47 or so ).

My 40 Ford coupe has a closed driveline and it is now has a 12 volt electric system. 12 volts are more volts than 6 volts BUT LESS amps so the wiring....if in good shapes will be OK. Hang a 12V alternator on it, install a 12 V battery........... and change the bulbs to 12V. Your gauges need a voltage drop (I changed mine to Stewart Warner 12V).

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Old 07-21-2003, 06:32 PM
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thanks adtkart, I was thinking that too but thought that was too simple!! i put the truck away 10 years ago and have not even looked at it in quite a while. but now i have the itch to get it out and drive it as long as i can!!

thanks Deuce! I was worried about the ignition system, plugs, wires, etc but it sounds like i can update the alternator and go which makes it fairly simple. When I was younger we built a 38 Deluxe and a 46 Business Coupe and now I remember the torque tubes. Any suggestions on the alt? Is there someone building a 12 that will bolt up to the original mounts?
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