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The Speedmaster shift selector shaft uses an O-ring to prevent leakage from GM TH400 cases
although slightly taller
These Speedmaster automatic transmission pans are OEM replacements for your vehicle
you will need housing ends to complete your project
100635 Spline Oversize Pinion Bearings:PCE207
Oldsmobile 400 425 455 2PC RMS 166 Tooth DNA® Billet SFI Flexplate The Speedmaster shift selector shaftSpeedmaster flexplates are the best on the market, made from 4340 round bar to exact tolerances. This one piece billet steel flexplate offers the strongest gear teeth, the least runout, and best longevity on the market. Every Speedmaster flexplate is 29. 2 SFI Approved and will withstand the extreme power and rpm of your performance application.
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