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JFH
Dodge Dakota
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4/16/2004
10:20:22
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 Subject: Gears
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Message:
I have a 93 2WD 5spd. It has the 3.23 Open diff. I need to get my power to the ground, I was wondering about the effects of a 3.55 and a 3.91? What kind of 1/4 mile improvments will they have, what kind of top speed affects and what kind of gas mileage affects.
Thanks for the help.
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bump
Dodge Dakota
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4/16/2004
10:28:12
|  RE: Gears
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Message:
should improve 1/4
Potential lower Max speed , but motor didn't have
HP to get to your present Max speed potential
anyway .
3.55 could actually improve mpg , depending on how you drive.
3.91 would decrease mpg , but give super towing
capabilities..
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JFH
Dodge Dakota
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4/16/2004
11:34:36
| RE: Gears
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Right now I have topped out 126, there was more power, but no road left. I would like to be able to keep 100+ on the top end. Will 3.90's keepp that?
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J and J Auto
GenII
4/16/2004
17:52:04
| RE: Gears
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Message:
Will 3.90's keep that?
Yes it may even top out higher because it will
be higher up in to the power band
4000 rpm should be around 110
there is virtualy no diff on ileage unless you
nail it every time you take off, I have even
seen trucks go from 3.55 to 3.91 with the V6 and
get better gas mileage
Larry
J&J Auto
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IntenseDak39
*GenIII*
4/16/2004
17:58:55
| RE: Gears
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i went from 3.55 to 4.10 and i didnt see any differences when i was nice to it. It really helps stop light to stop light.
6.6 Lt. Big Block, 727 TF shift kit, 452 heads, edelbrock 750 cfm, .513/.513 284/300 crower cam, comp cams springs, comp cams pushrods, 1.5 roller rockers, dp intake, mopar ignition, mopar windage tray, dual exhaust w/ 40 series flowmasters, 4.10 gears, coilover drag suspension, approx, 3500 lbs
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another mark
Dodge Dakota
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4/16/2004
18:03:05
| RE: Gears
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I upgraded my 3.55 to 3.91 and have not noticed any MPG loss over the last three tanks of gas.
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JFH
Dodge Dakota
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4/16/2004
22:32:26
| RE: Gears
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Message:
Guess I'll be getting 3.90's soon!
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NOSDART68
Dodge Dakota
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4/16/2004
22:55:27
| RE: Gears
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Does anyone know the formula for calculating a new gear ratio after installing a new set of rear tires off the top of their head???? What does dropping 3.5 inches diameter make the new ratio?? I'd really like to know!
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NOSDART68
Dodge Dakota
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4/17/2004
09:16:11
| RE: Gears
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bump
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NOSDART68
Dodge Dakota
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4/18/2004
11:49:09
| RE: Gears
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I'm sure someone knows how to do the math! It's some thing like... Original ratio x diameter or somethin, I NEED HELP!!
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JFH
Dodge Dakota
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4/18/2004
11:52:36
| RE: Gears
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Goto www.yahoo.com or another search engine and type gear ratio calculator, I did this a while back and found a few sites that will do the math for you.
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racerX
Dodge Dakota
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4/18/2004
22:39:25
| RE: Gears
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check out ring-pinion.com for an excellent caclulator for gear ratios/rpm/speed
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JFH
Dodge Dakota
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4/19/2004
15:01:38
| RE: Gears
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Message:
Just thinking, will my speedometer be all out of whack when I put the 3.9's in? As listed above, its a 93.
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Bump
Dodge Dakota
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4/21/2004
17:01:05
| RE: Gears
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Bump
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Bob Lincoln
Dodge Dakota
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4/22/2004
12:36:43
| RE: Gears
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It will be off, since with a 3.9 gear ratio you'll be turning a little faster at the same highway speed. Will it matter? 2200 RPMs vs 2000 would be representative. So it will read higher than what you're going by nearly 10%. At 70 it will read about 77.
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JFH
Dodge Dakota
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4/22/2004
12:39:35
| RE: Gears
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Message:
What if my stock tires were 195/75-15 and I currently have 215/60-15, right now my speedometer is slow, but I don't know how slow. Do you think it will even out?
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