fullfuel01 Posted December 14, 2013 Share Posted December 14, 2013 I am rebuilding my Superliner that will have E7 mecanical, it had a 18 Mack and 4.17 rears on 24.5. I hate the 18 and it will need a rebuilt. I want a 12 badly but I'll be loosing too much overdrive. I'm now looking to put an auxiliary (fuller or??) to get more road speed. looking for tips and advice! Quote Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/ Share on other sites More sharing options...
russoniellov Posted December 15, 2013 Share Posted December 15, 2013 You will usually be looking at big bucks for any sort of auxiliary tranny and pretty scarce to boot.... Quote Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/#findComment-221475 Share on other sites More sharing options...
terry Posted December 15, 2013 Share Posted December 15, 2013 I am rebuilding my Superliner that will have E7 mecanical, it had a 18 Mack and 4.17 rears on 24.5. I hate the 18 and it will need a rebuilt. I want a 12 badly but I'll be loosing too much overdrive. I'm now looking to put an auxiliary (fuller or??) to get more road speed. looking for tips and advice!Are you sure the 12 speed in the overdrive is not close to the 18 speed? Terry Quote Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/#findComment-221476 Share on other sites More sharing options...
rsb502 Posted December 15, 2013 Share Posted December 15, 2013 Mack 18 will have a .71OD the trtxl 1070 12 speed has a .78 so youd lose a little, if you want more highway speed or lower highway rpm Id swap the 4.17 rear carriers to a 3.86/3.87, thatll get you some more speed, just out of curiosity how fast do you want to go? I had 4.42 rears and a 12 speed OD in my 84 with 11R24.5's and it would run well over 70 if I had wanted to but I kept it down around 65-68. Im planning to swap my 3.65 rears back to 4.17 to get myself some more gearing and bring my rpm up right now im running 1400 at 70mph and I like to run around 1500-1600rpm for best mileage and power. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/#findComment-221477 Share on other sites More sharing options...
fullfuel01 Posted December 15, 2013 Author Share Posted December 15, 2013 It was just perfect with the 18 speeds. I overhauled both rears and found out that I wanted to get rid of the stupid 18. I do have other with 12 and 4.17 and they're just a little under what I want. This truck won't get dirty often, it will be used just haul my toys around. Quote Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/#findComment-221478 Share on other sites More sharing options...
rsb502 Posted December 15, 2013 Share Posted December 15, 2013 Whats wrong with the 18? You wanna sell it I like em, got a gear for everything. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33889-auxiliary-transmission/#findComment-221487 Share on other sites More sharing options...
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