Originally Posted by Frank Reiner

1) What is the current final drive ratio? Stamped into lower corner of the rear face of the main diff housing. Shifting will not be affected by a change of final drive ratio; the shifts will simply occur at a different road speed. [W114/115 cars with various engine installations had 3.92:1 gearing. I have one, should it not be found elsewhere.]

2) What is the transmission model? A string of numbers stamped into the right side pan rail just above the pan gasket surface.