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when i bought my truck it was a sport with the 17 in rims. i bought the 20s but i have the 3.55 gears front and back. now if i switch to the 3.93s its suposta have what will that do for performance. if i do the switch maby to 3.93 posi in the back and 3.93 in the front what will that do with my gas millage better or worse? i want it to have more kick but dont wanna compermise gas millage to much so i dont wanna go up to say a 4.10 as much as id like to.
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I think the very first thing that you should do is to measure the over all height of the 20's and the original 17's. The wheel diameter doesn't matter as far as gearing gos/ It's the over all height of the wheel tire combo. If they are close enough it shouldn't matter. But if there is a big differance in going to the 20's then you might want to regear.
2007 4X4 Quadcab Detonator Yellow Sport Hemi of coarse,rhino lined,EZ down,nerf bars,driving lights,one tap    |
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"Justyn"  |
Going up to the 3.92 might not hurt your gas mileage at all. There are guys going from 3.92 to 4.56 that are claiming better mpg. There is less pull on the motor the better gearing it has, therefore burning less fuel, I guess.
Amsoil Dealer (Greenwood, IN) Ph#: 317-383-6061 05 Atlantic Blue 1500 4x4 QC Superchips, Dynomax Bullett, 3rd Strike intake, Taylor Shorties, NGK 2314 Iridium plugs, 180 t-stat, Amsoil'd out, Tinted windows, torsion lifted, debadged, billet antenna, billet fuel door, Billet front/rear cup holders, tinted 3rd brake light, Ventshades, Line-X, Alpine 9885, Kicker KS series 5.25, and 6.5 components, Kicker KX350.2 amp, Kicker 12" DVC Comp VR Future Dodge Challenger owner...if I am rich or gas prices drop.... Many mods to come....hehehe.          |
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"Jay" HTC Man of the Year - 2009 President, South Carolina Chapter HTC.com Engine Specialist  |
 2003, Std. SWB, SLT, 20", 4:56 gear, AFE CAI, Superchip, 6.1 cam, 6.1 heads, Manley springs, retainers, pushrods, Edelbrock Hedders, 195 T-Stat, 8.2 Taylor, AEM, Power Wire, ARC-1,Amsoil Everything, and more. Veni Vidi Vici HTC.com Titan Killer Club               |
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"Rob" VP Alaska Chapter  |
 I would like to konw what you find out!! 2008 Dodge Durango 4x4 SLT HEMI and 2007 Dodge Ram 1500 4x4 SLT Quad Cab HEMI www.lubedealer.com/99705/        April 25, 2007!! |
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"Jordan" |
I say do it. IMHO the big 20's need at least 3.92 to get going efficiently, and this is one (rare) case where you shouldn't have to sacrifice mileage to increase performance.
_____________ 2004 QC 2WD Comp 268 cam, 6.1L valvesprings/pushrods, Pacesetter Jet-Hot coated LT's/ORY, K&N intake, Taylor shorties, Borla XR1 dumped, 3.92/posi rear, SCT tune by Hemifever, short belt for the track, 15% tint, 2" drop shackles, debadged except fenders |
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so leaning only towards gas millage and not performance at all is it worth going up to 4.10s or or would it be better to have the 3.93?
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"Justyn" |
I can't imagine those would be much different, although you would gain just a hair of performance too. If there are guys going from 3.92's to 4.56's and getting better mileage, I think you are safe anywhere in between. But with big rims/tires you should lean toward a lower end gear for sure. That is Chevy's problem IMO with their trucks. Forever they ran like 3.07's and such in there light trucks. Probably do 180 on the highway, but slow as heck off the line.
Amsoil Dealer (Greenwood, IN) Ph#: 317-383-6061 05 Atlantic Blue 1500 4x4 QC Superchips, Dynomax Bullett, 3rd Strike intake, Taylor Shorties, NGK 2314 Iridium plugs, 180 t-stat, Amsoil'd out, Tinted windows, torsion lifted, debadged, billet antenna, billet fuel door, Billet front/rear cup holders, tinted 3rd brake light, Ventshades, Line-X, Alpine 9885, Kicker KS series 5.25, and 6.5 components, Kicker KX350.2 amp, Kicker 12" DVC Comp VR Future Dodge Challenger owner...if I am rich or gas prices drop.... Many mods to come....hehehe. |
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I don't get the 4.56s helping gas mileage. I have 3.92s and the truck has good torque and lights em up easy. I would go to the 4.56s for the joy of the torque multiplication, but in no way assume equal or better mileage. I think 3.92 to 4.10 is a good range for people who still want some civility on the highway. I no longer have an interest in being civil, so I might do the 4.56 swap when the boss lets me.
Pavement was made to be pounded and Chevys were made to rust. (no rhyme needed when you state facts) Cuda Kong |
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I went from 3:92's to 4:56's and my highway mileage went up 2 mpg. If you figure your 5th gear ratio is .67 to 1, it equates to an old trans. with no overdrive and 3:23 gearing.If you are spending that kind of money for a gear swap, go with 4:56's. You won't be sorry.
SRT10 undersprung rear axle with 4:56 gears, Mcgaughy's 2" drop spindles and Belltech 2" drop coils, supermaxx longtube headers and hi perf cats, Edge Evolution gauge pack, Fiberglass hood with functional shaker ram air, and Airaid CAI, 180 Jet stat Flexalite E fan, Diablo tuner |
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when you say highway mileage do you mean around 60 or 75?
04 dodge ram rc/sb hemi 03 dodge ram qc/dually cummins   |
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I drive a divided highway to and from work about 40 miles round trip every day. Speed is always between 70 and 80 depending on traffic.RPM is 26 - 2700. More passing punch AND better mileage, how can you lose. IMO there is no downside to 4:56's
SRT10 undersprung rear axle with 4:56 gears, Mcgaughy's 2" drop spindles and Belltech 2" drop coils, supermaxx longtube headers and hi perf cats, Edge Evolution gauge pack, Fiberglass hood with functional shaker ram air, and Airaid CAI, 180 Jet stat Flexalite E fan, Diablo tuner |
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AHHHH stop it!!!! You guys are making me want to put 4.56s in my truck again
1959 Buick Electra 4 Door Sedan 1959 Pontiac Star Chief 4 Door Hard Top 1976 W200 Dodge Power Wagon 383/ 727 4x4 1986 W100 Dodge Power Ram 318/ 4 speed 4x4 2007 Dodge Ram Single Cab Long Bed - almost no options except posi and HEMI! www.Pontiac-59.com |
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Another plus is that the trans. will stay in 5th going up hills and under light acceleration whereas with my 3:92's it would shift back and forth between 4th and 5th gear.Ergo your whole drivetrain will live longer with 4:56's.
SRT10 undersprung rear axle with 4:56 gears, Mcgaughy's 2" drop spindles and Belltech 2" drop coils, supermaxx longtube headers and hi perf cats, Edge Evolution gauge pack, Fiberglass hood with functional shaker ram air, and Airaid CAI, 180 Jet stat Flexalite E fan, Diablo tuner |
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"Kelley" |
Is this on the stock 275/60/20 tires, (4:56) or do you have a different diameter tire?
'07 QC 4x2 Patriot Blue/Khaki AFE Brute force CAI/DS Predator tuner/Edelbrock Ceramic Coated Shorty headers/ True Dual Exhaust w/FlowMasters/180 Extreme E fan/Transgo reprogram/Belltech Drop Shackles & Rear SwayBar/JVC HU w/AMP & Kicker Speakers  |
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