Was it here on moparts years ago that I viewed a picture of
a foreign overdrive unit bolted to the rear of a 727 in place of the OEM tailshaft?

If my fuzzy memory is not fooling me this overdrive had what seemed like a small diameter.

I am not talking about a Gearvendors unit
or the overdrive add-on designed by Chrysler for the 518/46 automatic.

Less than an hour ago I was listening to Red Eye Radio on 820 WBAP out of Dallas and heard a commercial repeatedly for 2.18 ratio big truck differentials now available.