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KHarvey 02-25-2006, 05:26 PM Need to find the factory ring/pinion ratio I cant see the pinion due to the support bearing and a factory locker of some sort (brand unk) anyway the code stamped intot he ring gear is 2GM 3977384 10 41 6 79 I know the 3977384 indicates the axle ( at least I believe it does) but what about the rest? Is it a 4:10? :confused: Gotlabs 02-25-2006, 08:47 PM this may help 4.11 41-10 http://www.drivetrain.com/GMtrkratio_posidata.html KHarvey 02-26-2006, 03:55 AM Thanks, I was looking for the ratio to be indicated with the ring gear number first. Thanks again reddman 02-26-2006, 11:42 AM FA1 4.88/6.94 Rear 2-speed FA2 4.88/6.94 Rear 2-speed what is this? its on that list that gotlabs linked, but i have never seen a 2spd rear end. KHarvey 02-27-2006, 04:49 AM Nice math 41 ring gear teeth divided by 10 pinion teeth would make it a 4.10 not a 4.11 correct? trkklr77 02-27-2006, 07:22 AM .01 doest matter, seeing as how the front 10b was a 4.09 and rears are 4.11. | |