Editing TH400 rebuild tech (section)
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===Direct drum modification=== In the direct drum, leave out the center lip seal. This is the "dual feed" modification you read about. [[File:Th400centerseal.jpg|thumb|300px|left|TH400 direct drum, center seal left out; check ball circled]] <br style="clear:both"/> Notice the circle around the check ball in the aluminum piston. Each drum and piston assembly must have one of these check balls. The check ball may be in the piston, it may be in the drum as circled in the drum photo. [[File:T-400_direct_piston2.jpg|thumb|300px|left|TH400 piston check ball location]] <br style="clear:both"/> You must install a ''full'' set of returns springs in the direct drum. Ignore the experts or online information to leave springs out of the direct drum. If you have a set of heavy duty return springs from a kit or supplier, install half HD springs with half OEM springs. This helps to avoid residual oil behind the piston from forcing the piston out at high RPM when in 1st or 2nd gears. [[File:T-400_direct_piston.jpg|thumb|300px|left|TH400 piston with springs]] <br style="clear:both"/>
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