Some 2007-2010 2WD Toyota Tundra models may exhibit a small transmission fluid leak through the driveshaft slip yoke plug in the center of the yoke.
Manufacturing process changes were implemented at the supplier to reduce the possibility of this condition. Replacement of the driveshaft will correct the condition.
Install the new driveshaft using markings on the original driveshaft to assist in properly aligning the phase of the driveshaft.
Check ATF level. Add WS ATF as needed to adjust transmission fluid level.