Extension Housing and Park Lock
Clean the housing and park lock components in solvent and dry them with compressed air.Examine the park lock components in the housing. If replacement is necessary, remove the shaft with parallel jaw snap ring pliers and remove the sprag and spring. Then remove the spring clip and reaction plug. Compress the reaction plug spring clip only enough to remove and install it. Do not distort the clip during removal or installation.
Be sure a replacement sprag is installed so the sprag locking lug will face the park gear. Also be sure the spring is correctly positioned as shown. The sprag may not retract if the spring is improperly installed.