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You can fill the transmission once it is installed, or, like us, you can fill the transmission on the workbench before installation. Filling the transmission on the workbench is easier, but you will need an old driveshaft yoke or tailshaft plug to seal the back of the transmission during installation. Tremec recommends GM Synchromesh or equivalent. We filled our new TKO with Royal Purple's SynchroMax fluid.