So can someone tell me the best way to gain a little more road speed. DD15 with 10 speed OD and 342 rears low pro 22.5 tires.To get 75 MPH I am turning 2100 RPM
Need advice on gear ratio
Discussion in 'Experienced Truckers' Advice' started by MikeinTennessee, Mar 28, 2020.
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Take the Nanny off. Redline is 2150. Those low pros are not saving you much anyway.
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Most trucks like to run close to 1600 RPM and that usually comes out to around the legal speed limit. I understand why low pros are on, however prefer the 24's I would not be surprised to see the situation improve if 24's are back on there. -
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That’s impossible to do in the big hole with 3.42s and an 10 speed overdrive. I run a lower gear than you and don’t run anywhere near that high an rpm even past 85.
@Superhauler, mind giving a 2nd opinion? -
That’s a direct drive tranny, only way to get rpm’s down is swap tranny or gears.
51.50, singlescrewshaker, Rideandrepair and 3 others Thank this. -
Thats why I was wondering about swapping rears or tranny out. Not looking for 100 mile an hour truck. Just don't like that high RPM.
650cat425 and jamespmack Thank this. -
That leaves the transmission. However I don't know if it is possible to put in a transmission that will give you what you need at 75. It would be nice if you had a set of taller tires around to try it on and see if the speed situation improves versus your engine. 63 to 75 isnt that large.
I don't have any more ideas anything else I would say would not mean much. And that comes from a thought that the truck is useful to you and you want to keep using it.
Edit just read your response. No one is looking for 100 either. 75-80 is plenty. And you will have enough RPM's on hand to take on the smaller hills or deal with headwinds etc. -
I think you bought a truck that was made for 60 miles an hour
Crete?Rideandrepair Thanks this.
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