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Old 05-25-2016, 12:29 PM   #1
Mini-Skoolie
 
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Whats a good rear axle ratio for a TC2000 bluebird 5.9 cummins?

As the title states, I have read a lot here that the 5.9 is not ideal and underpowered. Whelp, I bought one.

So for highway use, whats a good rear axle ratio?
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Old 05-25-2016, 12:33 PM   #2
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Originally Posted by -cycosis- View Post
As the title states, I have read a lot here that the 5.9 is not ideal and underpowered. Whelp, I bought one.

So for highway use, whats a good rear axle ratio?
4 something should be good. Lower 4's are better.
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Old 05-25-2016, 12:41 PM   #3
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SO Im alright with a 4.44?
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Old 05-25-2016, 12:46 PM   #4
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SO Im alright with a 4.44?
Oh, absolutely. I don't have the cummins, but that's the axle ratio I'm running with my 195 hp/520 tq engine.
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Old 05-25-2016, 12:52 PM   #5
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Besides calculations, is there a way to figure out rear diff. ration?
Should it be on the diff. itself, maybe on a plate somewhere?
Haven't really looked, yet....

Where/how did you figure yours out?
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Old 05-25-2016, 12:56 PM   #6
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Run some numbers here...

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Old 05-25-2016, 01:01 PM   #7
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Run some numbers here...

Engine RPM Calculator
thanks, Tango!
I've see this calculator from other posts, was just wondering if anyone from the top of his/her head recalls if there is a plaque/note of rear gearing anywhere...
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Old 05-25-2016, 01:29 PM   #8
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On most units there is a plaque...somewhere. And it usually states the axle ratio but then, it could have been changed out.

Another way to find out what you actually have is to put it in neutral...jack up the driver side rear tires...align a mark on the tire and ground...and, put a mark on the driveshaft. Rotate the tire one full rev...and count how many turns the shaft makes. That will be your ratio or at least get you close enough to look up what is/was avail on your rig and get a match. I had to do that on mine and discovered the rear end was NOT what was indicated.
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Old 05-25-2016, 01:33 PM   #9
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Besides calculations, is there a way to figure out rear diff. ration?
Should it be on the diff. itself, maybe on a plate somewhere?
Haven't really looked, yet....

Where/how did you figure yours out?
There are usually two metal information plates attached above the driver's seat/windshield area. One of them will have the rear axle ratio.

There also may be a tag on the axle itself.
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Old 05-25-2016, 01:43 PM   #10
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As the title states, I have read a lot here that the 5.9 is not ideal and underpowered. Whelp, I bought one.

So for highway use, whats a good rear axle ratio?
The 5.9 Cummins came in Dodge pickups. This engine is an industrial engine - very heavy duty. There are many inexpensive ways to increase performance on the 5.9 - it's no big deal.

Your 4.44 rear axle ratio is pretty good. The lower the number, the better for highway cruising. The higher the number, the better for acceleration.

We could tell you more if we knew what transmission you have!
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