[Cglrcng]

Interesting, on our Mopar FWD vehicles (A413, series transaxle, lots of other numbers involved), there is no chain, just a set of side case gears that mesh w/ one another, that help lower or raise the final ratio. See the pics attached, only so many ratios were factory produced that fit, but it is possible to mill, or mfg different tooth combos to fit. And yes those smaller wheel/tire additions lower the final gear ratio. (Pics to follow, need to resize them first). Then, of course 1st and second gearsets can also be changed, third is 1:1. Then add the smallest wheel tire combo to lower that finial ratio. It certainly helps.