Peter, It may well be that the synthetic oil is causing your problem. Inside
the OD is a clutch which drives regardless of whether it's in OD or out of
OD. I know of one other who used Synthetic oil in his OD and it caused the
OD to slip. It has excellent lubricity, so good that it causes the OD clutch
to slip.
I have no personal experience and it may well take a few flushes to get it
out of the system.
My 2 cents worth.
Jerrry Van Vlack
----- Original Message -----
From: "Peter Fullam" <pfullam@nycap.rr.com>
To: "Randall" <tr3driver@comcast.net>
Cc: "Triumph List" <triumphs@autox.team.net>
Sent: Saturday, August 21, 2004 5:22 PM
Subject: gearbox lube
> Randall
>
> Per your suggestion to the list, I moved my electric fan feed from the
> starter solenoid over to the A1 terminal on the regulator. Works fine,
> only now it draws 7 amps when it didn't use to draw any :-)
>
> To revive a well-worn thread, I have a gearbox/overdrive lube question.
> The OD gearbox conversion cost too much and went on too long, but in the
> end it got done in time for Richmond. Everything was fine until the
> autocross. It was a very tight 1st gear course with 4 hairpin turns. I
> hit the gas coming out of the first turn and it went to 5 grand-in
> neutral. Bang it back in gear, down to the next turn, same thing. It
> jumped out of 1st 3 or 4 times on every run. 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 started thinking about other symptoms: It is possible to beat the
> synchro on a downshift to 2nd. The box shifts very freely, with none of
> the notchiness TRs are known for. The OD tailshaft bearings had to be
> reset, and the guy who did it recommended Mobil 1 75-90 Synthetic gear
> oil. A local place had it, so thats what I used. Can synthetic oil be
> too slippery, so that the synchro sometimes doesn't, or there's no
> "feel" in the shifter rod detents? Is the mass of the shifter rod enough
> to override the detent and slide it out of gear on a
> deceleration/overrun? Can this be solved by a change to (enter a brand
> name here) non-synthetic gear oil?
>
> Cheers
> Pete
> CT19207L.....O
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