Aug. 27, 2015—American Axle & Manufacturing (AAM) announced on Wednesday the availability of its new 4.56 and 5.13 ratio ring and pinion gear sets for the Ram and GM 9.25” front axles.
“These new gear sets are perfect for truck owners who want to upfit their four wheel drive setup with bigger tires, mudders and much more,” said Pat Angst, senior manager, AAM Aftermarket. “These gear sets provide an increase in torque that truck modifiers are looking for.”
AAM part #40146855 is a 4.56 gear set for the 2007-2013.5 Ram 9.25” axle, AAM part #40146853 is a 4.56 gear set for the 2013.5 and newer Ram 9.25” axle, and AAM part #400244878 is a 4.56 gear set for the 1988 to current GM 9.25” axle. The 5.13 gear set for 1988 to current GM 9.25” axle is AAM part #40136007.
These ratios will match up to the AAM 11.5” rear axles offered in the Ram and GM truck series, according to AAM. The ring and pinion gear sets in the 11.5” rear GM and Ram axles that match these front axle gear sets are AAM part#4005988 (4.56 Ram and GM 11.5” rear axle), and AAM part# 40030646 (5.13 GM 11.5” rear axle).
