That an easy one Deve. I would wire up the Over-drive electrical to run the
toggle switch through a relay and place a switch on the transmission that is
actuated by the reverse lever which would interrupt the current to the relay
and disengage the Over-drive "ONLY IN REVERSE"!
JOE
-----Original Message-----
From: Deve Krehbiel <dkrehbiel@kscable.com>
To: oletrucks@autox.team.net <oletrucks@autox.team.net>;
old-chevy-truck@egroups.com <old-chevy-truck@egroups.com>
Date: Sunday, December 10, 2000 4:55 PM
Subject: [oletrucks] 3 Speed Standard Overdrive
>I am hoping someone here can help me with a problem I am anticipating. I
>have just installed a 3 speed standard transmission with overdrive in my 50
>deluxe cab. Its not the one I am doing the frame up resto on. Anyhow, from
>what I understand, it amounts to 6 speeds. 1st gear and then 1st gear in
>overdrive, etc. To engage the overdrive, there is two ways to do it. The
way
>it was done originally, you had a kickdown switch on the carb base that
when
>putting the gas pedal to the floor, disengaged the overdrive. (from what I
>understand). There is also a governor that takes it out of overdrive below
>about 30 mph.
>
>Since I don't have all the switch, cable and associated hardware nor do I
>have a clue how to wire all this, an old friend of mine who has lots of
>experience with these overdrives suggest I just put a toggle switch on the
>shifter and then do the switching into overdrive manually and not bother
>using the governor. Its not very elegant but it would work. The toggle
>switch engages the solenoid and puts it in overdrive on demand. Thats fine
>and all, but there is a problem with that.
>
>I have two other friends with this very setup that have ruined their
>overdrive tranny because they forgot to flip the switch out of overdrive
>before putting the truck into reverse. Apparently reverse is a very bad
>thing for these transmissions if left in overdrive.
>
>I am hoping someone here can help me with an electrical solution. I had in
>mind a system where any attempt to put it in reverse disengages the
>solenoid. I have noticed that when I put the tranny in reverse, there is a
>mechanical that moves it out of overdrive anyway, but for some reason, this
>system fails. Anyone can shed any light on this, please respond. A wiring
>diagram on how this trans was originally set up would be nice.
>
>Thanks!
>
>Deve Krehbiel
>Hesston, Kansas
>1950 3100 * 1949 3600 * 1948 4400 * 50 3100
>www.speedprint.com/Deves50/index.html
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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