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Old 06-02-2012, 04:35 PM
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the rear of the 4l60e case is open in a 4x4 application. The t-case is sealed at the front.

Often these adapters become warped and not flat where the gasket needs to seal. You can unbolt the adapter from t he back of the 4l60e trans. Flat sand that area on something large enough to bring the surface back to level.

A square cut O-ring seals up the t-case adapter to the 4l60e case
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