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Trey
Dodge Dakota
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11/06/2002
23:19:02
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 Subject: 3.91, or 4.10, or 4.56???
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I have a 99 dak 4x4, 5.2 auto, with 3.55 gears and stock size 31" tires. I mostly drive the freeway (60-90mph) and I was thinking about getting some lower gears for some more low end power and acceleration. With the 3.55s I cruse at 70mph, just under 2000rpm. If I did get lower gears, how would this affect Milage and power. I do not care about top speed it is already fast enough for a 4x4.
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Trey
Dodge Dakota
JOIN HERE
11/06/2002
23:21:08
|  RE: 3.91, or 4.10, or 4.56???
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Forgot to mention, The truck is going to stay stock height, and keep the stock size tires. I might get a super though :)
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FortWorth4x4
GenIII
11/07/2002
00:57:37
| RE: 3.91, or 4.10, or 4.56???
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I wouldnt go any lower than 3.92. If you go lower than that your truck will suffer at higher speeds. It will have power to go faster but the gear ratio stops it from going any faster.
'99 White CC SLT 5.2L V8 4x4 Auto 9" Lift 35x12.5x15 ProComp Xterrains....plus more.
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Dan Gruber
GenIII
11/07/2002
04:10:38
| RE: 3.91, or 4.10, or 4.56???
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I'd go with the 4.10. 4.56 gears with 31 inch tires would be too low for me. You're looking at about 200 RPM higher at 70 mph with the 3.91's, and just under 300 more RPM at 70 with the 4.10's. 4.56's would give almost 500 more RPM at 70...that's quite a jump.
I changed mine to 3.92's in April (from 3.55's; no 4.10's available for 2000 and newer front diffs) and I really like the difference. The truck feels much more responsive and the transmission doesn't hunt for the right gear going up hills. The damage to gas mileage has been negligible...maybe 1-2 mpg at speeds of 70+, and no change below that.
Hope that helps.
Dan
2000 CC SLT 4.7 4X4 Auto 3.92 LSD
3 inch Performance Accesories lift & 32 inch BFG MT KM's
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UWGriz
Dodge Dakota
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11/07/2002
09:59:04
| RE: 3.91, or 4.10, or 4.56???
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I'd go with 3.92s if you're staying with the 31s. I've got 4.10s for my 33s and plan to go to 35s without changing.
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