Walt1967 Posted June 6, 2017 Share Posted June 6, 2017 Hi again everyone ,I am looking to purchase a 1993 cl 713 Mack .it has a 425 cat,13 speed and 4.42 Mack rears on camelback springs. is this a good set up to pull Michigan gravel trains.(grossing 154000). My concern is that it won't go fast on freeway.are the 4.42s to steep? Truck is original to my knowledge. Quote Link to comment https://www.bigmacktrucks.com/topic/50080-rear-end-ratio/ Share on other sites More sharing options...
Underdog Posted June 6, 2017 Share Posted June 6, 2017 Hi again everyone ,I am looking to purchase a 1993 cl 713 Mack .it has a 425 cat,13 speed and 4.42 Mack rears on camelback springs. is this a good set up to pull Michigan gravel trains.(grossing 154000). My concern is that it won't go fast on freeway.are the 4.42s to steep? Truck is original to my knowledge.How fast do you want to go with a Michigan train? With an overdrive 13 you should be good for 70 mph. And the Mack 4.42s are bulletproof.Sent from my XT1254 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/50080-rear-end-ratio/#findComment-371574 Share on other sites More sharing options...
Walt1967 Posted June 6, 2017 Author Share Posted June 6, 2017 This is the older 13 speed correct?i think it has a .85 last gear.60-65 is good for me,but how many rpms. will it be turning.it has 11 r 22.5 low pros now but I can Change them out to 11r22.5.thanks for input Quote Link to comment https://www.bigmacktrucks.com/topic/50080-rear-end-ratio/#findComment-371577 Share on other sites More sharing options...
Timmyb Posted June 6, 2017 Share Posted June 6, 2017 A good friend of mine has a single overdrive 18sp with 3.9's. He is doing 100km/h or 60mph at 1750rpm. My guess is you could get 60mph by around 1950rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/50080-rear-end-ratio/#findComment-371580 Share on other sites More sharing options...
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