> It actually glided out of
> gear very quietly, with no jump or snap from the shifter. It does this
> only on a heavy overrun in 1st, and has not done it in street driving.
> The bushings, synchros and 1st/2nd shifter fork are new, and all bushing
> and gear end floats are in spec.
I've heard of this problem being caused by using synthetic gear oil in
Triumph transmissions.
As Jerry said, it's too slick, and makes things like the detents that hold
the box in gear (and cause that characteristic notchiness) not work as
designed. I've not tried it myself, but supposedly it's impossible to get
the proper detent forces (which are supposed to be checked and adjusted as
part of a rebuild) when using synthetic gear oil as lubricant.
> Can this be solved by a change to (enter a brand
> name here) non-synthetic gear oil?
It's definitely worth a try. Or if you want to stick with synthetic, you
could try Redline's MTL-90, which is designed specifically for manual
transmissions that need a certain amount of friction for the synchros and
detents to work.
Several people recommend Valvoline Racing 20W50 motor oil for Triumph ODs.
It has some specific characteristics that may make it better suited than
most motor oils. That's what I'm using at the moment, although I plan to
try MTL-90.
Randall
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