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Old July 23rd, 2007, 01:10 AM   #1
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Default Gas mileage be damned...

Swapped 4.10's into the Dodge. (94, 2500, NV4500)

Looking to bump the RPM's up while towing. Went from 3.55's. I figure if it's too low I can jump to 285 75's. With the 3.55's it set into a nice slot towing at around 76-78. I would like for it to do the same at maybe 70-72. Not everyone likes to tow at 80 MPH I guess.

With the 265's 1st gear is even less usable :tonka:
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Old July 23rd, 2007, 08:43 AM   #2
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Not sure of your question. If it is a diesel, not many switch from 3.55 to 4.11, usualy the other way. It won't hurt mileage unless you run much more than 2000 rpm.
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Old July 23rd, 2007, 10:39 AM   #3
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Not sure of your question. If it is a diesel, not many switch from 3.55 to 4.11, usualy the other way. It won't hurt mileage unless you run much more than 2000 rpm.
No question... just making conversation I guess... This forum is dead and stuff.
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Old July 23rd, 2007, 12:11 PM   #4
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Meh, my 360 3/4 ton came with 4.10s stock. It was still underpowered.

Diesels will get better mileage with the 4.10s, instead of the 3.55s, at least according to internal testing at dodge.

I don't think you'll see any difference with the mileage, monkey. undergearing usually hurts mileage, at least city driving.

Of course, My V10 gets just as good or better mileage than my dog of a 360 did.
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Old July 23rd, 2007, 12:13 PM   #5
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Not everyone likes to tow at 80 MPH I guess.
I do.
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Old July 23rd, 2007, 12:42 PM   #6
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I do too...
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Old July 23rd, 2007, 12:46 PM   #7
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I haven't GPS'd it yet, but it appears that 2500 rpm is somewhere between 70 & 80 mph with 5.13's and the 40's, as I can gradually pass people out on open highway that are most likely travelling over the limit.
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Old July 23rd, 2007, 02:21 PM   #8
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What is your current mpg?
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Old July 23rd, 2007, 03:00 PM   #9
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What is your current mpg?
13-14 highway unloaded
8-12 city depending on how I drive that tank
10-11 towing the Jeep on a flatbed in 5th
8-9 towing the Jeep on a flatbed in 4th.
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Old July 23rd, 2007, 03:01 PM   #10
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Meh, my 360 3/4 ton came with 4.10s stock. It was still underpowered.
I think my 5.9 has plenty of power.... maybe it's the manual?
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Old July 23rd, 2007, 03:11 PM   #11
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I think my 5.9 has plenty of power.... maybe it's the manual?
He is talking gas I think? Unless you are being humorous then yes, my 5.9 six cylinder seems to make plenty of power as well.

Your mpg #'s sound a touch low, you might want to get the timing turned up to about 16 degrees. :chiefwoohaw:


Other reasons for low mileage = old fuel filter, low fuel pressure at the injection pump, from the lift pump (usualy caused by the pressure spring wearing out in the side of the hp pump).
just my .002
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Old July 23rd, 2007, 04:23 PM   #12
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I have a gasser.
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Old July 25th, 2007, 10:42 AM   #13
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I think my 5.9 has plenty of power.... maybe it's the manual?
Mine's pretty quick and breaks the 33's loose very easily.

It ran a 16.3 1/4 mile.
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Old July 25th, 2007, 11:25 AM   #14
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Empty, mine always felt quick. But just wasn't enough power for towing. It towed decent at 80, but 65-70 was just in a dead spot.

I think the auto did suck a lot of power down. Plus it was the heaviest of the 3/4s (quad cab, long bed, 4x4 camper special), which didn't help.

If you looked at 1/2 ton 4x4s that year, the 5.9s got better mileage than the 5.2s because they didn't work as hard. Although 3/4 tons didn't list window stickered gas figures, I suspect the V10s were no worse than the 5.9s. Everyone I knew with a V10 did just as good as those with the V8s. My V10 has 133k on the ticker and turns in better numbers than my V8 truck did (my V10 is 3.55s though).
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Old July 25th, 2007, 06:43 PM   #15
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Empty, mine always felt quick. But just wasn't enough power for towing. It towed decent at 80, but 65-70 was just in a dead spot.

I think the auto did suck a lot of power down. Plus it was the heaviest of the 3/4s (quad cab, long bed, 4x4 camper special), which didn't help.

If you looked at 1/2 ton 4x4s that year, the 5.9s got better mileage than the 5.2s because they didn't work as hard. Although 3/4 tons didn't list window stickered gas figures, I suspect the V10s were no worse than the 5.9s. Everyone I knew with a V10 did just as good as those with the V8s. My V10 has 133k on the ticker and turns in better numbers than my V8 truck did (my V10 is 3.55s though).
It was more than likely that you had the heaviest damn 3/4 tone you could get. I can understand why it felt underpowered towing.

On the other hand, my regular cab short bed 4x4 feels just great towing.
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Old August 1st, 2007, 01:49 PM   #16
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Diesels will get better mileage with the 4.10s, instead of the 3.55s, at least according to internal testing at dodge.
That's weird. My truck compared to my buddys truck, same setup (mine has 4.10's his has 3.55's)

8 mpg difference.

The effective power (torque range) of the 5.9 diesel is low (18-1900 rpms)

cruising down the free way my truck is running 2400 rpms @ 70. It tops out around 85, no more fuel, no more RPMs

I will be changing my truck to 3.54's if I keep it.

The 4.10's are for pullin the big loads.
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Old August 1st, 2007, 01:54 PM   #17
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Internal testing aside, common sense says a lower revving engine will produce higher MPG....
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Old August 1st, 2007, 01:55 PM   #18
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That's weird. My truck compared to my buddys truck, same setup (mine has 4.10's his has 3.55's)

8 mpg difference.
I would imagine their testing is at 55 mph
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Old August 1st, 2007, 01:59 PM   #19
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I would imagine their testing is at 55 mph
Either way

My truck runs ~2000 rpms at 60
with 3.55's it would be around 1800 RPMS - hence right at mid of the torque curve

Prolly why almost all truck with diesels in them came with 3.55's except some tow package trucks and most duallys.
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Old August 1st, 2007, 02:07 PM   #20
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yeah... reminds me of what the dyno technicians around here say

"all testing is wrong, but some of it is usefull"
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