Ford 6F35 (Gen. 1 and 2) and GM 6T40 (Gen. 1 and 2) transmissions are notorious for worn axle bushings, which allow external leakage. This premature bushing wear can be caused by a worn differential support, which affects endplay negatively. The thrust bearing that rides on the differential support rotates, wearing deeply into the aluminum support and allowing endplay to become far excessive. To correct endplay, a new case half is required.
Instead of sourcing an expensive new case, you can stop further wear, reduce endplay or restore endplay to proper levels by installing Sonnax case saver kit 144281-01K.

Non-rotating shims correct differential endplay and prevent future wear
Prevents repeat bushing failure caused by excess endplay

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