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28 Chev Overdrive


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Can anyone provide details on an overdrive for a 28 Chev? ie do they exist, who makes/sells them? where can we get 1?<P>Thanks

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Right after WW II,an outfit made a unit that fit in driveshafts of the Chevies that used a torque tube.On,like a 51 Chev,you took some material out of the torque-tube and installed this unit. I cant remember the name,but it may have been Truxel (no relation to Ruckstell) Also,there are several outfits that cut Ford driveshafts and install overdrives.A friend even had one put in his 38 Buick

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With most of the add on overdrives you end up with free wheeling. Im an not a fan of free wheeling - - - I drive my old cars in the mountains a lot and I like that fact that I can use the motor to slow me down and not rely on the old brakes as much.<P>Dan<p>[ 05-05-2002: Message edited by: D Binger ]

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I agree with the previous post about free wheeling. Also check out you torque and horsepower curves. It is possible to lower the revs to the point where you don't have the power to go as fast as before. Were you trying to for faster or just to lower your revs. As built, with the proper oil, all the dippers and troughs set proper and bearing clearances set right you whould be able to drive 50 mph or a little better all day every day. Unless you are used to it the noise level will seem a bit loud but that is how they were then.<BR>Happy hobbying

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Thanks Reid and others<P>It was really about top speed mainly.<P>At present she'll do 45 mph or thereabouts.<P>I was hoping for 55 and had heard that the o/drive would do this. I understand it required removal and shortening of the prop shat. The unit is then bolted in behind the g/box and onto the shortened prop shaft, with an extra gear lever to dis/engage.<P>Thanks again.<P>Matthew

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I have used Mitchell overdrive units in several cars including Essex, Plymouth and Buick, These are solid, well engineered units with a small operating lever as you mention and they can be adapted either for torque-tube or hotchkiss driveshafts.<BR>They are very popular among Model A owners.<BR>The phone # for Mitchell Mfrg. is 415-883-7519 I don't think they are online. Good luck. Carleton smile.gif" border="0

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See this Johnson Highway Over Gear webpage link below for more info on what some of us have installed for inhance driving on our Annual Chev 4 Tours here in the US. Unfortunately after about 60 of these gear boxes were manufactured over 6-7 year period, the production was stopped for good and they are no longer available for sale.<BR> <BR><A HREF="http://www.cybersurfers.net/~herb/overdrive.htm" TARGET=_blank>Johnson web page</A>

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