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We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
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With the 19.5" wheels the tires are commercial, same as you see on gas powred motorhomes. These tiers prety much don't get flats, I had two nails in one of my tires last week, all the way through, an
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Assuming that you were in 6th gear (.73:1). Axle ratio = [(engine rpm) (tire diameter in inches)] / [(mph) (336) (transmission gear ratio)] ? = [(1825 rpm) (33.4")] / [(
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I was just making sure I was using that calculator correctly. I punched in my stock size in both fields and came up with 3:55 which is the ratio of both axles. So my final drive ratio is at 3:55-1 ?
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Welcome To Mopar1973Man.Com LLC
We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
So the truck came with a set of Rickson wheels 19.5" and a set of tires that were less than a year old. I liked the old forged-in-America wheels so I decided ot keep them on the truck.
I have never had one of these trucks befoer this one so I have no comparative baseline on how it "should" run and drive. In LA these trucks are like hen's teeth and I have not found anyone near me that knows much abou them at all. My local dodge dealer is a waste of real estate and every time I've gone there they turn up their nose at my old truck and try to sell me a new truck :-) I couldn't even get a radiotor cap from that palce.
After studdying this issue of tire size, on this website, more closely I decided to take a closer look at my set up as believe there is a fly in the ointment.
Now for the more-fun-with-math part.
So according to Mopar1973Man the goal is to have a Final Drive Ratio that is between 3.55 & 3.73
My truck started its life with a final drive ration of 3.55 (Dana 80 in the rear and Data 60 in the front)
Stock tire size was 235/85-R16
Current tire size is 203 245/70-R19.5
So I have a lift of about .85"
https://tiresize.com/comparison/
Upon running the calculation I now have a paultry effective final drive ratio of 3.41, so far so bad.
https://tiresize.com/gear-ratio-calculator/
Now the question is to should I lower the water or raise the bridge?
I could keep the wheels and change the gearing in the Axels or I can get a set of wheels and tires.
Either solution will cost about the same in the greater LA Area.
So let's say I decided to go the regearing route.
I believe Dana offers 3.73 and 4.1 gearing.
The question is this, if I went the re-gearing route which would be preferable (either 3.73 or 4.1) and why?
Also I have the NV5600 at (0.73:1) and I'm not exactly sure how to add that into my math here or that's even relevant.
Thanks @Mopar1973Man for this article this is super helpful in trying to sort this all out.
Edited by leety