Automotive transmissions are vented, otherwise the pressure buildup due to
heat would force the oil out past the seals.
I have seen on-off valves designed to be used in the crankcase drain, don't
see why you couldn't fit one here, pump the oil through it and then close
the valve.
Of course, my preferred solution is to use the earlier TR3 top cover, with
the dipstick and filler hole, but that might not be as attractive on the
later cars without the hole in the transmission tunnel.
Randall
> That's how you do it with boats. You pump it from the bottom
> until the fluid
> appears at the level hole. Then you insert the plug at the top.
> This creates
> an air lock that allows the bottom pipe to be withdrawn without the oil
> flooding out. Then you insert the bottom drain plug. Very tidy if done
> right.
>
> I don't know if there is too much air in the transmission to create an air
> lock, but it's worth a try.
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