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Difference in fuel mileage in Dodge rear-end gears

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LeonardWD45
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PostPosted: Sat Nov 18, 2017 6:00 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

I have a 99 3/4 ton 4x4 extended cab with a 24 valve and automatic trans. I currently live in Tacoma Wa, and drive to my farm in eastern Wa generally every weekend. I fill in Tacoma and can get to the farm and back to George Wa without refilling and still have a 1/4 tank of fuel. I run on cruse control once I get on I90 @ 67mph indicated but gps says I'm at 75.

I took a trip back to Ill. a couple of years ago went east empty and bought a 14k goose neck trailer in Ill. then over to just about Indiana. Loaded a All Crop 90 on the trailer then back to the farm. I filled only once in each state I passed through both east and west, except SD since they were predicting a bad snow storm. When I got into Wa they pulled me into the scale and I was running 4600 on steers, 9600 on drives, and 7400 on trailer, all the way from Ill., over the Rockies.

This being said I thought I got fantastic mileage with the truck.

Leonard
 
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Walter Buller
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PostPosted: Sun Nov 19, 2017 8:34 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

Quite inventive of you. I have a similar challenge. There is no room in the usual location to mount an AC compressor under the hood of my "94 Chevy
3500 with the 12v Cummins installed, so we are considering removing the oil fill tube, replacing it with a fill point on one of the valve covers, and
then mounting a compressor just left of the inj. pump. Might be difficult to find room up front though for the condenser.
 
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Walter Buller
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PostPosted: Sun Nov 19, 2017 8:47 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

That sounds okay, but the only way to know exactly what your fuel mileage is is to fill er up, write down the odometer reading, drive it, fill er up again, write down your new odometer reading, then divide the number of gallons it took to re-fill it into the difference between the first odometer reading and the second one. That's your true mpg. A simple example is my Mazda Protege. It goes 340 miles on 10 gallons of gas. That's 34 mpg.
 
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Destroked 450
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Location: Harned, Ky.

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PostPosted: Sun Nov 19, 2017 9:38 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote


There's a outfit called Cummins Diesel Repowers in Mt. (Auto World) that has several different bracket options for mounting the AC compressor and alternators.
I got a set of brackets from them in order to reuse my Ford alternator rather than rig up a external regulator for a Dodge alternator.

I may have a extra oil fill valve cover, have one on my truck but they are a pain when adding oil, in goes down slow and is easy to overflow and slip oil over the engine.
In cold weather I put my oil bottles in a pan of boiling water to thin the oil so it will flow in faster.
 
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Walter Buller
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PostPosted: Tue Nov 21, 2017 7:24 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

Thanks so much for the info.
 
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fixerupper
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PostPosted: Wed Dec 06, 2017 7:05 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

my 98 24 valve long frame ton dually 2WD with 3:54 gears and 5 speed gets 16 at the very best on a long trip. Normal putz around driving is 13-15.
 
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kossuth
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PostPosted: Fri Jan 19, 2018 12:41 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

CVPost-Walter Buller wrote:
(quoted from post at 13:23:00 10/30/17) I have an opportunity to buy a really clean 1999 Dodge dually with only 80K on the 5.9 Cummins motor, 336K on the body and A.T.,but with 4.10 or 4.11
rear end gears. Owner says best he gets empty is 15 mpg. I know where there is a rear end for this truck with 3.54 or 3.55 gears, like the one in my
"93 dually that gets 22 mpg, for $900. I don't do any real heavy hauling anymore. I was just wondering if any of you guys have any experience with a
"99 Dodge rear end with 3.54 gears that indicate that the one I have found would provide substantially better fuel mileage to justify the $900 price.
Also, the Dodge 2500 that the motor came out of is part of the deal. It has the 5 speed manual transmission in the bed, which I assume is an NV 4500,
plus the motor that came out of the "99. Owner says a while back when he stopped for a fill-up while driving the dually, pure water from the bottom of
the tank in the ground at the store got picked up and pumped into his fuel tank. He says he didn't realize this until later when the motor quit, had
water in it and in the injector pump. Seems to me they ought to be repairable. Any comments would be appreciated.
My dad had a truck that was darn near the same as what you are looking at. 99 with the cummins, AT, 4x4, crew cab dually with 4.10 gears. Running around empty it would get about 18 or so. Truck was completely bone stock and stayed that way until he got rid of it.
 
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Walter Buller
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PostPosted: Sat Jan 20, 2018 11:13 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

Moot point now. Seller won't return my calls. Guess he changed his mind. Don't need it anyway. Finally finished the conversion project: Put a "93 12v
Cummins into a real nice Chevy Silverado dually. Runs great. Got the wiring issues worked out.
 
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ArleninOr
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PostPosted: Sat Jan 20, 2018 12:33 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

Walter, if we may ask, what was the wiring issue? Curiosity is killing me.
 
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Destroked 450
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PostPosted: Sat Jan 20, 2018 12:48 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote


What did you find that was causing the issue with the lights?
 
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Walter Buller
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PostPosted: Sat Jan 20, 2018 6:15 pm    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

When either the headlights were turned on or you pressed the brake pedal, the dash gauges stopped working, the turn signals stopped working, the power door locks and power windows stopped working and the speedometer stopped working. Several people here said they were sure it was a grounding issue so we installed more grounds but the problem persisted. One person suggested it might be the turn signal switch so we put a new one in but that had no affect either. I figured we may as well change the turn signal relay and the flasher since they were the only components of the lights that we had not yet changed. That solved the problem. I suspect that the culprit was the relay because the flasher actually would work when the headlights were not on or when the brake pedal was not being depressed. But we were pulling our hair out for awhile.
 
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rustyfarmall
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PostPosted: Sun Jan 21, 2018 6:22 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote


I owned a 1980 Ford Fiesta many years ago. It developed an issue with completely discharging the battery anytime it sat for more than 2 hours. I traced the problem down to the turn signal flasher. It was some kind of an electronic device with transistors and diodes inside of a plastic box. I replaced it with a conventional flasher unit. End of problem.
 
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Walter Buller
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PostPosted: Sun Jan 21, 2018 9:10 am    Post subject: Re: Difference in fuel mileage in Dodge rear-end gears Reply to specific post Reply with quote

See below.
 
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