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  1. #1

    Default 07 chevy silverado rear end gears

    hello, everyone my name is carlos am new to the truck world,,i own a 2007 silverado lt /5.3 2wd... my truck came with a 3:42 gear am trying to find out if i should stay with that or go with the 3:73 gears .. am just looking for a little more pep from the truck and mpg,,thx all in advance

  2. #2
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    murdog94's Avatar
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    Default

    i think with the cost of converting it you will actually save you money and fuel as well by staying with the 3.42 rear. the 3.42rear is what they recorded the EPA fuel numbers off of. Now if you want more pep there are a ton of other options that you have and most will save you fuel as well. Try looking and searching around the site some and you will be surprised at what you can do..
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

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    I agree with murdog94, for the cost of regearing you can get some performance other, easier ways (long tube headers, Diablo programmer, CAI) and they should help your gas mileage.

  4. #4
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    stephan's Avatar
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    Hey Carlos welcome to the GM truck club. I gotta agree with Murgog & STB on this. Unless you plan on doing a lot of towing or hauling heavy loads, STAY with your 3:42s. You'll be a lot happier at the gas pump, & like they said, there are a LOT of other alternatives that are easier than swapping gears.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  5. #5
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    mfleetwood's Avatar
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    Welcome!!! Gotta agree with what's stated above.


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  6. #6

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    thanks everyone i will be staying with the 3:42 ,,i do appreciate the advise i will be doing some research on cold air intake and a programmer and exhaust .,,hope u all had a great turkey day

  7. #7

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    this is a tough one. As they said above the gear swap will take with it your good gas mileage. But out of everything COMBINED I have done to my truck I noticed the best increase in acceleration/power from the taller gears. Its what they used to do back in the 60's/70's to make a muscle car go faster. Stock 0-60 was about 7.5-8 seconds (depending on conditions). After all my engine mods, the programmer, exhaust, CAI, ignition and spacer, it only went down to about 6.7 seconds, maybe 6.5 seconds on a nice cool day. Then I put on the lift and 33" tires and it went back up slightly around 7 seconds. After swapping from stock 3.73 to the 4.56 gears, the thing is rediculous. I have a friend with a radar gun zap me at 5.5 seconds and my tuner backed it up. The best and worst part is that I can roast my 33" tires, but I don't want to roast these mud tires! As far as trucks go I've only been beat by an SRT-10 since the gear swap, not even a Raptor or a Tundra can catch me until after about 110mph and by then I have no more gears left in my transmission lol. Been looking for a redneck guy with an old 350 and 4.56 gears to whoop my butt someday, but just havent run into one yet. But if you're just looking for a little more fun, get an exhuast so you can enjoy the sound of it, and a programmer, intake will all help get the MPG down even more.
    ROTARYENGINEPETE
    '07 GMC SIERRA SLT | Z71 | 4X4 | 5.3L FF

    LIFT:
    ROUGH COUNTRY 3" PREMIUM SUSPENSION LIFT + ADD-A-LEAF
    18" ATX THUG WHEELS
    33" NITTO TRAIL GRAPPLER TIRES
    EBC SPORT ROTORS
    EBC YELLOW STUFF BRAKE PADS
    LIGHTING:
    HELLA/VVME 4300K HID LOW BEAMS

    HELLA BLACK MAGIC OFFROAD LIGHTS
    ANZO USA PROJECTORS HEADLIGHTS
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    ENGINE:
    K&N 63 SERIES INTAKE
    MAGNAFLOW CATBACK D.O.S.I.F.T. EXHAUST
    BULLYDOG TRIPLE DOG GT TUNER

    PULSTAR IGNITORS
    OPTIMA RED TOP
    DRIVETRAIN:
    YUKON 4.56 GEARS
    MAG-HYTEC DIFF COVER
    CORVETTE SERVO
    TRANSGO SHIFT KIT
    Z-PACK 3-4 CLUTCH
    REBUILT WARN XFER CASE
    BODY:
    RUNCOOL HOOD LOUVERS
    FULL WEATHERTECH VISORS/BUGSHIELDS
    DUPONT BEDLINER

    DEEZEE BLACK DIAMOND PLATE BED CAPS
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    5.5sec 0-60mph on pavement (5.2sec running E85), and a little less in 3 feet of muddy water

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