Re: j-type overdrive 1st & 2nd gear lockout

["Don J. Howard" <dhoward@jht.com>]

The lower gears are locked out to protect the cone clutch.  At low
revolutions there is not enough hydraulic pressure in the
accumulator(400psi) to smartly engage the cone clutch and minimize wear
on its friction surfaces.  On older models the thought that second gear
type speeds would ensure the desired pressure in the accumulator.  I
guess second speed starts were still possible adding to wear.  third
speed starts not very likely.  The later overdrive modifications were to
reduce stress on the joints in the TR6 drive line.

Cheers, Don J. Howard