ford444 Posted January 18, 2009 Share Posted January 18, 2009 I was looking into later down the road to take out 20 speed quad box and installing a newer mack 9 or 10 speed mack transmission wondering if anyone has done this swap and what i'll need to do? My setup is endt673c engine with single clutch, but do have flywheel for double clutch setup. I know I'll have too make trans mounts and extend drive shaft but not sure what other modifications I'll have to do. My rear ends are 3.87 ratio with 22.5 low pro tires. Quote Link to comment https://www.bigmacktrucks.com/topic/7997-air-shift-mack-transmission-for-b61/ Share on other sites More sharing options...
terry Posted January 18, 2009 Share Posted January 18, 2009 With a double disc pull clutch you will have to figure out how to make your linkage pull the throughout bearing instead of pushing, like the single disc clutch does. terry Quote Link to comment https://www.bigmacktrucks.com/topic/7997-air-shift-mack-transmission-for-b61/#findComment-29309 Share on other sites More sharing options...
HK Trucking Posted January 18, 2009 Share Posted January 18, 2009 My question is why would anyone want to take out a quad box (IMHO the greatest transmission in history) and replace it with a modern day transmission? Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/7997-air-shift-mack-transmission-for-b61/#findComment-29310 Share on other sites More sharing options...
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