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4.10: rpm @65mph
- Thread starter raven_dt
- Start date
jadmt
Well-Known Member
remember if you put taller tires on that will lower your rpm as well. here is a fun calculator.
Calculate RPM for Given Speed(MPH), Rear Gear Ratio, and Trans Gear Ratio
Calculate RPM for Given Speed(MPH), Rear Gear Ratio, and Trans Gear Ratio
purperformance.com
LateToTheParty
Didn't want to come
Up a sustained 6% grade with 37s and right at payload capacity (hauling, not towing) mine was cruising right at 2500RPMs a couple months ago.
Can't say I've paid close enough attention on flat ground though as I don't drive 65 very often.
Can't say I've paid close enough attention on flat ground though as I don't drive 65 very often.
Not me, I'm a plain vanilla/stock guy.
Rockcrawlindude
a rock crawlin’ dude
This is easy to calculate. Math it.
keep in mind you need to know the exact tire size and your speedo needs to be calibrated for your truck to match the math.
hint: it’s 10% more than a truck with 3.73s
keep in mind you need to know the exact tire size and your speedo needs to be calibrated for your truck to match the math.
hint: it’s 10% more than a truck with 3.73s
Rockcrawlindude
a rock crawlin’ dude
If you had 3.73s you would be at ~1590.
You can then look at the power/torque curve of the motor and compare.
I am at 1750 at 70 with 3.73- 33.5” tall tires 8th gear.
LateToTheParty
Didn't want to come
You are not the same.
@Firebird mentioned 1950 at 70mph and 1750 at 65mph with 4.10s
Your 1750 at 70mph with 3.73s falls right in line with what @Rockcrawlerdude stated you'd be at at 65mph
Gearing Analyzer with Shift Tracer
Enter gear ratios, tire and diff ratio to analyze RPM vs velocity at shift points with tracer
www.blocklayer.com
Thx, I went ahead and created my own in excel.Gearing Analyzer with Shift Tracer
Enter gear ratios, tire and diff ratio to analyze RPM vs velocity at shift points with tracer
New 2500 6.4 eta is 6/16 to 6/30...still wondering about the 6.4/4.10 mpg. For reference my 7.3/3.55 (87 octane/unloaded). Lie-o-meter is typically .5mpg optimistic:
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jadmt
Well-Known Member
Are you replacing your Ford with 7.3 gasser? If so why? My 2020 Power wagon with 4.10 and 35's will get that kind of mpg if driven 65-70mph. This was with stock tires and my lie meter is about the same as yours sometimes it is almost spot on other times up to 1 mpg off.
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Thats my 2020 7.3. 15-16mpg from a big block is pretty good. The 7.3 is great, the 10 speed not so much. About 90% in daily driving its fine. Otherwise, slow shifts, erratic downshift, etc. The 7.3 is good enough to make me tolerate the 10 speed...maybe. When I get the call that the Tradesman is at the dealer it might be a difficult decision to part ways with the Ford. And I'm a Ram guy...
**edit**
I'm worried that I'll get similar or less mpg with a smaller/less powerful engine. That's why I ordered the Ram w a 4.10 to bridge the power gap. However, with the 4.10, am I losing the mpg that I need for range? The smaller fuel tank in the Ram makes the mpg a concern on longer tows. We camp 3-4 times a year at a campground about 245 miles away (500 round trip). The 7.3 has the range to get there without stopping (barely). It looks like the 2500 would need a fuel stop before reaching our destination.
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jadmt
Well-Known Member
4.10's won't make a difference on your mpg in fact you might get better. My good buddy had a 2019 RAM with 3.73 and he traded for a 2020 with 4.10 and his mpg actually was better. The small tank does suck no doubt. I wish it were at least 36 or bigger
I usually lock 10th out when towing because it causes excessive downshifts. 100% agree, at least you can order a 1500 with a 33 gal tank, why not give the 2500 buyers a 34 gal standard. The 6.7 aren't that much impacted by the 31 gal tank. But with gas engines range is important for those of us that tow relatively long distances. 2500 mile trip coming up in July.
