harleydavee Posted February 15, 2010 Share Posted February 15, 2010 Looking at adding another truck. Looking at a 2001 Mack CX613 with 460, 13 speed Eaton, 3.90 gears. also have a choice of 2001 CX613 427,fro 10 speed, 3.73 rears or a 2003 CX613 460P, 13 speed eaton, 3.90 gears. both 3.90s have tall 22.5 tires and the 3.73 has lo-pro 22.5. We run midwest corridor(Mn- Tx and Oh- Denver) with very few mountain runs. I would prefer 3.55 gears for fuel economy but have read where could hurt performance. Looking for the PERFECT (lol) setup. any ideas? We also haul weight sensitive loads so trying to stay somewhat light weight. Quote Link to comment https://www.bigmacktrucks.com/topic/12661-trying-to-find-the-best-set-up/ Share on other sites More sharing options...
usmcjimbo Posted February 15, 2010 Share Posted February 15, 2010 Ideally no matter what your engine/transmission/rear end is, on an over the road truck you want to be running at between 1400 and 1500 rpms at your desired cruise speed, which for nearly all large fleets is 65-70mphPersonally I was always a fan of direct drive set ups in high gear, but everyone has their own ideasPerformance and hill climbing ability will always be a function of increased fuel consumption Quote Link to comment https://www.bigmacktrucks.com/topic/12661-trying-to-find-the-best-set-up/#findComment-49750 Share on other sites More sharing options...
Gambi80 Posted February 15, 2010 Share Posted February 15, 2010 The trucks with 22.5 talls and 3:90 gears probably won't be any different than the 3:73 and low-pro 22.5's going down the road...far as speed/rpm's go. The 10sp will be about 100lbs lighter. Personally I'd go with the most gears and power. lol Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/12661-trying-to-find-the-best-set-up/#findComment-49751 Share on other sites More sharing options...
harleydavee Posted February 15, 2010 Author Share Posted February 15, 2010 thanks for your input. My 01 Vision gets better fuel economy if the driver keeps it in the 1350 rpm area. Didn't know if the 460s were the same or had a different sweet spot? Put tall 22.5 rubber with 3.73 rears on my CX613, the driver likes them since he can run slower rpms and still maintain some speed. Quote Link to comment https://www.bigmacktrucks.com/topic/12661-trying-to-find-the-best-set-up/#findComment-49757 Share on other sites More sharing options...
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