Not true. It can take the same gearset as any regular A-833. 4th gear is always 1:1. The O/D 3rd gear uses a smaller diameter on the mainshaft. It is the last gear on the mainshaft. Just before the 3/4 synchro assy. The 3.09 input shafts are the same as some O/D boxes but that is the 1:1 gear 4th in a regular A-833 and 3rd in an O/D box.
