luke andres Posted December 30, 2016 Share Posted December 30, 2016 so I pulled the 2080 mack tranny out of my 1991 dm tri axle dump and put in a eaton 8LL since my eaton 13 speed mysteriously "walked off" I'm actually glad thou since the 8LL is more of a dump tranny and the 13 being more for road tractor I also went from 5:73 to 4:42 rears Love the difference now and wasn't a bad job to do Had to shorten drive shaft 3 inches Now I would like to get a few more horses out of this 300 engine It has a bosch p7100 all mechanical pump Any helpful advice would be nice to get I also have a 94 ch road tractor that is a parts truck with a good 350 engine in it but it has a fuel pump that has electric wires going to it Not sure if I would be able to just change the turbo and injectors and bump the timing or not Anyone know Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/48141-91-mack-dm-tri-axle-dump-with-300-horse/ Share on other sites More sharing options...
keg1 Posted December 30, 2016 Share Posted December 30, 2016 I have an 85 r model with a 250 in it. I had the pump rebuilt and turned up. I'm happy with how it runs. I had an 89 with a 350 in it that ran real good this ones not quite as good but does a good job. Quote Link to comment https://www.bigmacktrucks.com/topic/48141-91-mack-dm-tri-axle-dump-with-300-horse/#findComment-356526 Share on other sites More sharing options...
luke andres Posted December 31, 2016 Author Share Posted December 31, 2016 did you have to change turbo and injectors too or just mess with the pump? Quote Link to comment https://www.bigmacktrucks.com/topic/48141-91-mack-dm-tri-axle-dump-with-300-horse/#findComment-356643 Share on other sites More sharing options...
keg1 Posted December 31, 2016 Share Posted December 31, 2016 1 hour ago, luke andres said: did you have to change turbo and injectors too or just mess with the pump? I just had the pump worked on Quote Link to comment https://www.bigmacktrucks.com/topic/48141-91-mack-dm-tri-axle-dump-with-300-horse/#findComment-356646 Share on other sites More sharing options...
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