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Old 05-25-2016, 02:24 PM   #11
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i have a cummins 5.9, at545, and a 4.7 rear. the math on the calculator works out perfectly. top speed of 67mph at 2500rpm

a 4.4 would be ideal imo

that should get close to 75mph
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Old 05-25-2016, 03:09 PM   #12
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This special needs bus has a 3.54, but that's apparently to make up for my small tires.
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Old 05-25-2016, 03:16 PM   #13
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yeah thats another thing to look at is not just axle and transmission its also tire sizes.. like robnin mentioned some handicap busses have smaller rear tires so it can have a flat floor inside..
like a VAN

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Old 05-25-2016, 05:18 PM   #14
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Not LIKE a van. It's a van. Yes, I may have an inferiority complex about my little wheels.
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Old 05-25-2016, 05:24 PM   #15
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Originally Posted by Robin97396 View Post
Not LIKE a van. It's a van. Yes, I may have an inferiority complex about my little wheels.
Your little wheels are fine. They get the job done. Just not as quick as bigger ones.
Just messin around.
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Old 05-25-2016, 06:35 PM   #16
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This special needs bus has a 3.54, but that's apparently to make up for my smallish tires.
Same here but a 4.10 would be ideal for my driving style plus I live in hill country.
My bus will do way past it's stability capabilities not to mention tire speed limits.

Fixed it for you Robin!
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Old 05-25-2016, 07:57 PM   #17
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Yes, smallish sounds much better. It's the "ish" that neutralizes the sting. As long as they keep getting me to the grocery store I'm ok.
Wow, a 4.10. And I have so much trouble climbing hills. If I put on air bags I could increase to big boy wheels, but that would give me less power. Everything seems to center around this darn 545.
Gimme back my stick shift. But yeah, in traffic during rush hour when my leg gets tired on that clutch somebody is likely to get rear ended. I've got to remind myself to not fix things that don't need fixing.
I'm not sure if these tires are smallish or RVish.
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Old 05-25-2016, 10:26 PM   #18
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It's all about the sweet spot for your engine. It is a very specialized technical term and should not be used loosely. You don't want to be driving down the freeway at 2700 rpm just because that is where the governor stops you. In case you didn't know, that's not good. My 1995 International has a DT408, AT545 trans, 9R22.5 tiresand a 4.78 rearend ratio. I'm at 2500 rpm @ 55mph. It kills me to drive with the engine turning that fast so I drive about 45-50 mph. The world goes by really slow at that speed.

What am I going to do about this? In this order, I will

1. Go to a larger tire size. Probably 11R22.5..
2. Swap my trans to a lockup trans. I have an AT1545 out of a 2 1/2 ton military truck.

These two things should drop rpm to about 2100 @ 55mph. If that is not enough, I will swap the 4.78 to a 4.44 rearend. I want to be at 2000 or a little under.
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Old 05-26-2016, 01:56 AM   #19
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Cal's got figger'd out. You have to take it all into consideration and aim for that sweet spot unless you want to burn a motor and suck way too much fuel doing it.
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Old 05-26-2016, 09:46 AM   #20
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ive heard about that sweet spot, but never found it.

plenty of peeps on the interweb say that you can run the cummins 5.9 pegged to the redline all day.

on the interstate, mine sure is. if i swapped to a 4.3 and got 75mph, i'd still peg it on the freeway for 75mph.

you'd need to gear it for max speed of 85mph before you got the sweet spot in a cruising speed. i honestly dont think the cummins 5.9 makes the kind of power to push that gearing. not at my weight of 20k lbs+. i can barely go uphill now.
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