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hardbody
Dodge Dakota
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1/22/2002
00:25:57
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 Subject: 3.55 vs 3.92 gears RPM
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I'm curious I have a 01 4x4 4.7 auto with the 3.55 gears, anyone with the same truck but with 3.92 gears out here who can tell me what RPM they turn at say 60 MPH? Thanks,
TONY
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smokindak
Dodge Dakota
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1/22/2002
15:46:47
|  RE: 3.55 vs 3.92 gears RPM
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It would be only like 100 or 200 rpm more, if that
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teamfast
Dodge Dakota
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1/22/2002
16:24:21
| RE: 3.55 vs 3.92 gears RPM
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Great question! I almost posted it a few times (damn short term memory), Third gear in my 4.7 with 3.55 is one to one speed : tach. Great for 130km and up in 3rd! she climbs...
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kevster
Dodge Dakota
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1/22/2002
22:27:22
| RE: 3.55 vs 3.92 gears RPM
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I have two Daks, my 2000 4.7 4x2 automatic turns 2,000 RPM at 60 MPH With the 3;55. and my 2002 QUAD CAB 4X4 4.7, auto, turns 2,000 rpm with 3;92 both at 60 MPH. Go figure...transmissions are the 45 RFE i think the trans and computer balance it out. I really thought it would be 2-300 RPM more on the 4x4.
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CW
GenIII
1/22/2002
22:46:50
|  RE: 3.55 vs 3.92 gears RPM
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The '02 45rfe has a double overdrive programed into the software. Makes for a little high speed final drive ratio.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Working on adjustable fuel pressure with return.
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hardbody
Dodge Dakota
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1/23/2002
00:01:03
| RE: 3.55 vs 3.92 gears RPM
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The reason your rpm is the same from the 2wd to
the 4wd ( with the 3.55's and 3.92's) most likely
has to do with the difference in tire diameter
which will effect the
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YA
Dodge Dakota
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1/23/2002
00:37:56
| RE: 3.55 vs 3.92 gears RPM
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Yes, It's the tires that make the difference.
Gear ratio is always figured with a 28" tire.
The auto (truck) industry adjust variables from there.
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Hersbird
Dodge Dakota
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1/23/2002
00:52:26
| RE: 3.55 vs 3.92 gears RPM
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YA- I'm not sure what you mean by the gear ratio being figured with a 28" tall tire. The gear ratio is the gear ratio, and it's doesn't matter if its with 25" tall tires or 33" tall tires. You defeniately will feel a difference between two tire diameters as it effectively changes the ratio that is actually put to the ground. That said a 3.92 gear set in a 4x4 dakota with 31" tires is the same set found in a 2wd with 28" tall tires. The 2wd will turn much higher rpms in high gear at 60 MPH though because of the shorter tires. Kevsters two dakotas turn the same rpm because the tires offset the gears as pointed out by Hardbody. Tall tires are one of the big reasons 4x4 dakotas are not as fast as their 2wd twins. That and all the extra weight is rotating mass, which is ten times as devestating as regular weight in acceleration.
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Crusty
Dodge Dakota
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1/23/2002
01:46:33
| RE: 3.55 vs 3.92 gears RPM
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My 2000 4x4 3.92 with 31x10.50 tires turned 3000rpm at 90mph. thats all I remember
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Clevite 77
Dodge Dakota
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1/23/2002
08:10:50
| RE: 3.55 vs 3.92 gears RPM
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2002 4x4 3.92's 60mph = 2,000rmp w/ 2650 miles on the truck
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Clevite 77
Dodge Dakota
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1/23/2002
10:44:48
| RE: 3.55 vs 3.92 gears RPM
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BTW it's an auto
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IntenseDak39
GenIII
1/23/2002
11:35:18
| RE: 3.55 vs 3.92 gears RPM
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yall can go to www.ring-pinion.com and find your rpm at what speed...just put in the tire diameter..speed and it will tell you what rpm you'll be doing...you can choose your final gear ratio and there also is a program to input your tire size and it will tell you about what diameter your tire is...i've tested it and it was pretty close...maybe 50 rpm's off due to tire diameters of different companies vary.
98 RC V6 auto modifications: LOTS ! ! !
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HEATH
Dodge Dakota
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1/23/2002
16:42:06
| RE: 3.55 vs 3.92 gears RPM
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2001 2WD 4.7 3.92 AUTO 16" WHEELS W/255/65 TIRES
2200@60MPH
57.5 @ 2000
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Ben E-Farrer
Dodge Dakota
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1/23/2002
18:47:28
| RE: 3.55 vs 3.92 gears RPM
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My '92 V8 4X4 with a 3.92 and an auto did 2100RPM at 60MPH, my 2001 4.7 4X4 auto with the 3.55 and 31" tires does 1700RPM at 60mph and 2600RPM at 100MPH.
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Ben E-Farrer
Dodge Dakota
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1/23/2002
18:50:42
| RE: 3.55 vs 3.92 gears RPM
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My '92 had lots of low end grunt, put struggled to pass something quickly, my '01 has not much low end grunt but goes really quickly at 30mph+.
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hardbody
Dodge Dakota
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1/23/2002
19:02:01
| RE: 3.55 vs 3.92 gears RPM
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My 01 4x4 4.7 auto, 3.55's with the 265/75/16 tires does 60 mph at around 1750 rpm I noticed today
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Demon-Xanth
Dodge Dakota
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1/24/2002
01:13:47
| RE: 3.55 vs 3.92 gears RPM
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Math time:
assumption: truck w/ 3.55s does 2000RPM at 60 MPH
2000/3.55*3.92==2208RPM
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STEVEN
Dodge Dakota
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8/31/2012
09:50:34
| RE: 3.55 vs 3.92 gears RPM
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98 DAKOTA 4X4 5.2 3.55 GEARS 1600 AT 60 MPH 31x10.50
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