National Output Shaft Seal for 1968-1971 Mustangs with a Toploader Transmission and 31 Spline Output Shaft.This is a direct replacement seal from National. This output shaft seal mounts to the rear of the transmission where the driveshaft connects. If your driveshaft slip yoke has fluid leaking off of it, you could need to replace this seal.
Measures 1.687" x 2.502" x .312" "
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Is this the same thing as a shift shaft seal?
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