Austin Gurley Posted December 21, 2019 Share Posted December 21, 2019 I have recently purchased a 89 Mack super liner with a e6 350 and Mack 9 speed, I use the truck to move equipment from job to job dozers excavators etc... truck really lacks power my old r with 300 and a 5 speed with pull about as much, suggestions on power increase?? I have also thought of an v8 Mack swap how hard would this be? Quote Link to comment Share on other sites More sharing options...
alex g Posted December 21, 2019 Share Posted December 21, 2019 Lack of power could be alot of things. First of is your turbo creating any boost. Should run at least 25 lbs Quote Link to comment Share on other sites More sharing options...
1965 Posted December 21, 2019 Share Posted December 21, 2019 Not going to be a hole bunch of difference between the 300 & the 350. Quote Link to comment Share on other sites More sharing options...
Rob Posted December 21, 2019 Share Posted December 21, 2019 If you are working in the lower end of the range as it sounds like you are moving equipment short distance as in jobsite to jobsite, a 300 "Maxidyne" will easily outperform an "Econodyne" 350, (IMO) if both are in good tune. The "Maxidyne" settings are more optimized for that where the "Econodyne" is more of a road use setup. Lot's of room to work with that 350 however, till you get to the point where it will destroy itself by physical limitations. 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
Jake86 Posted December 26, 2019 Share Posted December 26, 2019 I would swap in am E9 or 3406B.. what’s your hearing? Definitely wouldn’t want anything less than a 13spd for lowboy. With 4.33 in the pigs Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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