Could be that after you installed the new motor mounts,you may need to readjust you're shift linkage.That may take care of the truck popping out of third gear.On a three speed trans the linkage goes between the column and the engine ,trans.
When you changed the mounts that changed the shift linkage going to the trans.
Pete
Last edited by Pete52; 06/16/2012 1:22 PM.
