Hi John,
For good diagnosis we need one more piece of information..
When the overdrive is engaged and you are doing 3100 RPM is the speed of
the car higher than when the overdrive is not engaged at 3100 RPM.
I suspect not and that the overdrive is not actually "engaging" until you
lift off the throttle.
If that is the case then the cause can be as simple as maladjustment of the
overdrive operating valve or as complex as low oil pressure in the
overdrive or even worn cone clutch linings.
Michael S
On Mon, Aug 19, 2013 at 12:20 PM, john spaur <jmsdarch@sbcglobal.net> wrote:
> I searched the archives and could not find any posts to help me.
>
> Driving in gear at 3100 RPM with the overdrive engaged, the tach will drop
> about 1000 RPM when I take my foot off the accelerator. When I put my foot
> back on the accelerator it is the RPM comes slowly up 3100.
>
> When I do the same thing with the OD disengaged, the tack will show very
> little decrease in RPM's. When I press on the accelerator the RPM's come
> back to 3100 very quickly.
>
> What might be causing the RPM drop with the OD engaged?
>
> John Spaur
> '62 BT7
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