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dmould
Dodge Dakota
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8/05/2004
12:38:42
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 Subject: 3.55 vs. 3.92 Highway RPM
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My Dakota is a 2004 4x4 (265 tires) with the 4.7L manual transmission and 3.55 gears. 60mph = 1750rpm, 75mph = 2100rpm. What are your guys with the 3.92 gears turning?
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justinboone
Dodge Dakota
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8/05/2004
16:03:28
|  RE: 3.55 vs. 3.92 Highway RPM
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i have a r/t and at 60mph@2500 rpm,75mph@3200 w/ 265/55/17. gas mileage sucks but its well worth it. you also have a 4x4 though.
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.boB
Dodge Dakota
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8/05/2004
16:52:09
| RE: 3.55 vs. 3.92 Highway RPM
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If you swap to 3.92 gears, you'll be doing 55@1750rpm's, and 66@2100rpm's.
Your gas mileage won't change enough to matter, if at all. But your engine will be into it's power band sooner. You'll be able to use OD, and accelerate without downshifting at lower speeds.
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00 RT/BC
Dodge Dakota
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8/05/2004
16:58:34
| RE: 3.55 vs. 3.92 Highway RPM
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Here is what I found
26 Inch tire 80KM/H 3.55 Rear end 5-speed tranny
RPM in 5th - 3781
With a 3.92
RPM in 5th - 4175
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cal
Dodge Dakota
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8/05/2004
17:16:06
| RE: 3.55 vs. 3.92 Highway RPM
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dmould
If you're correct about your rpm with your current tire height:
3.55 gears. 60mph = 1750rpm, 75mph = 2100rpm
Then
3.92 gears 60mph = 1932rpm, 75mph = 2319rpm
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R/T
Dodge Dakota
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8/05/2004
17:18:16
| RE: 3.55 vs. 3.92 Highway RPM
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justin- i have an R/T and im at 2000rpm @ 60
mph...why so different?
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cal
Dodge Dakota
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8/05/2004
17:24:49
| RE: 3.55 vs. 3.92 Highway RPM
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R/T
Because of your tire height (drive wheels) and gear ratio.
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justinboone
Dodge Dakota
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8/05/2004
17:51:42
|  RE: 3.55 vs. 3.92 Highway RPM
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i am about 3900 when my thruck floats out at 115. is that not normal with 265/55s?
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vern
Dodge Dakota
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8/08/2004
09:43:01
| RE: 3.55 vs. 3.92 Highway RPM
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89 dak 4x4, A500 trans, 235/75/15s, 3.92s, 27" dia tire
55mph @ 1700rpm in od
55mph @ 2700rpm in drive
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dakjkb
Dodge Dakota
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8/08/2004
13:22:36
| RE: 3.55 vs. 3.92 Highway RPM
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what are the formulas that you guys are using? I have a 98 4x4 and I have thought of 3.92 I have 31x10.50's what dose that work out to with gas milage and rpms at 70-80mph? Thanks.
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