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Removed pan to change gasket was leaking due to a few bump on pan,
surprise at the buttom there was a crust of oil deposit about 3/16" thick, oil was dark but no smell of burning inside or in oil, also all visible parts from the pan opening have an oil crust on them.
since car did not have brake when I got it, with engine running , car on jack stand, transmission was working and shifting gears , but there was no work load on it.

Is there an easy way to remove this oil crust from inside the transmission parts, like using a special thinner soaking with the pan back on, or other suggestions to fix this.

Car could have been sitting for at least last 30 years

Andre Trudel
Montreal.

It depends on how crusty the deposit is.

I would suggest that you first try pouring enough kerosene to completely cover the deposit, and then some, and leave the pan sit somewhere safe outdoors, overnight, but covered with tinfoil.

Then, see if a gentle scrubbing action with a stiff nylon bristle cleaning brush will start to break it up, and report back to us.

Maybe someone put some kind of tranny treatment in before you had it and it set?

In any case, +1 on kerosene and gentle scrubbing, maybe even with a plain green scotch brite pad (without soap embedded, of course.)

Dear Andre:

Ouch! You are probably looking at settlement and oil oxidation due to extended storage.

It is probably superficial and removable using cans of brake parts cleaner or wax and grease remover from a local paint store. You'll need a pan to capture the mess and safety glasses, but I wouldn't recommend trying to flush the transmission.

Putting the pan back on, filling to oil level, and soaking - without starting - would probably be okay too, but more work.

After the car is on the road changing the fluid once or twice will probably take care of the rest.

Good luck.