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The slinger on your transmission is backward. The slinger is cupped shaped. Note the outer edge of yours is pointed to the rear bearinng and the outter edge of Lawrie's is pointed inward toward the inside of the transmission.
If you remove the U-joint and the rear bearing retainer along with the rear bearing the slinger should come out and can be reversed. Note there is a double metal shielded bearing to replace the rear bearing just remove the inner shield so trans oil can reach the bearing internals, this will stop the leaking. Make sure the snap ring on the perimeter of the rear bearing is .075" thick and not much thinner.
The helix teeth in your transmission main shaft do differ from the teeth on Lawrie's. Yours is good and a different year than Lawrie's.