whitegold Posted December 11, 2013 Share Posted December 11, 2013 got my superliner on the road now and really like it a lot, but.... I want an 18 speed. I haul heavy (gvw 6 digits), and lots of hills, but I still want it to get out there and run 75 with ease. I was told my truck has 4:10 deep reduction rears, and its got a maxitourqe 9 speed. it runs great out on the interstate, but on the roads I mostly run (50-55mph) 7th is screamin and 8th is so low rpm you downshift when ya get a headwind, I got an 18 eaton fuller in my kw I wrecked, would that work or should I get a mack 18? Quote THE MILKMAN DID IT..... Link to comment Share on other sites More sharing options...
Superdog Posted December 11, 2013 Share Posted December 11, 2013 The Mack 9 speed has a .71 overdrive,the Mack 18 speed would be the same. Not sure about the Fuller but always thought it was a .73. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted December 11, 2013 Share Posted December 11, 2013 It'll work, it will have a lower low gear for off road use and the top end rpm will only change a little from the .71 to .73 OD, gotta get the right bell housing and clutch fork for it though, Mack uses an underslung fork and the rear mounts are on the bell housing. 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 Share on other sites More sharing options...
mack mhe9 Posted December 11, 2013 Share Posted December 11, 2013 Mack 18 will shift harder then the fuller. Mack trans much stronger, 3 counter shafts as to 2. Quote Link to comment Share on other sites More sharing options...
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