Packard Forum Index » Pre-War (1899-1942)

If I remember correctly the 3-speed synchro was introduced from the get-go on 9th Series Light Eight, Eight and Twin Six; on the other models it was introduced as production capacity caught up with demand, a 4-speed synchro being used in the interim.

But regardless of what might have been OEM and what trans might be in the car today, hypoid gear oils aren't the best choice to be used in synchro gearboxes.