All right! I'll talk! the cam doohickey actuates a normally open
switch which allows the OD to engage only when the trans is in third
or fourth gear. Don't recall right now whether the contacts are in
the supply circuit or the return ["ground"], but they are there.
Y'know you can keep the present diff (I assume it's a 4.11) and go
like crazy off the line but still keep the revs [somewhat] down at
speed with the OD engaged. 4.11/3.89 is a ratio of 1.06; the OD gives
you 1.25, so even with the 4.11 axle, you'll be spinning at lower revs
than before the OD.
Enjoy!
Donald.
> Date: Fri, 05 Jan 2001 16:00:57 -0500
> From: Douglas Frank <frank@zk3.dec.com>
>
>
> Hi all,
>
> What would I need to convert my '73 GT6 to overdrive? Here's
> what I know so far:
>
[snips]
> 4. there's some sort of cam doohickey hanging off the front end
> of the shifter, sitting atop the gearbox top cover, which looks
> like it might work a switch or something. (If you know what this
> does, please don't keep it a secret! :)
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