greg Posted August 6, 2006 Share Posted August 6, 2006 I was recently told that you could take the back cover off a 6 speed airshifttrans. and add a couple of gears and make it a 12 speed. This seems like it a rumor to me, anyone know of the truth? thanks greg Quote Link to comment https://www.bigmacktrucks.com/topic/1395-mack-6-speed-air-shift/ Share on other sites More sharing options...
terry Posted August 6, 2006 Share Posted August 6, 2006 I was recently told that you could take the back cover off a 6 speed airshifttrans. and add a couple of gears and make it a 12 speed. This seems like it a rumor to me, anyone know of the truth? thanks gregThe 12 spd. has a whole other box bolted to the front, for your low range, for a total of 3 boxes bolted together, a pretty large tranny. I have one in my dump truck, far as i'm concerned the best tranny mack ever made. terry Quote Link to comment https://www.bigmacktrucks.com/topic/1395-mack-6-speed-air-shift/#findComment-6977 Share on other sites More sharing options...
maxidyne237 Posted August 7, 2006 Share Posted August 7, 2006 its funny to me that people either love mack 12 speeds or hate them. Quote Link to comment https://www.bigmacktrucks.com/topic/1395-mack-6-speed-air-shift/#findComment-7000 Share on other sites More sharing options...
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