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  1. #1

    Default New tires, would like to regear to compensate

    I have a 2010 silverado 1500 with the 5.3L and the 6 speed, and the 3.08 gear. I have recently added a lift and tires and obviously truck no longer has the grunt off the line like it did. I know I need to change gear to fix this small issue, I would like to know which gears would be ideal for the new tires and still keep my mileage from falling thru the floor. I had the 265/65/18 tires stock, and now I am running a 305/65R18 almost exactly 2 inches taller, I know I will not get it exactly like it was but I was considering a going to 3.73's. Will they fir with my current carrier in my front diff? The rear diff should be fine. Any info would be greatly appreciated.
    Thanks
    Blu

  2. #2

    Default

    Quote Originally Posted by bluavalancheZ71 View Post
    I have a 2010 silverado 1500 with the 5.3L and the 6 speed, and the 3.08 gear. I have recently added a lift and tires and obviously truck no longer has the grunt off the line like it did. I know I need to change gear to fix this small issue, I would like to know which gears would be ideal for the new tires and still keep my mileage from falling thru the floor. I had the 265/65/18 tires stock, and now I am running a 305/65R18 almost exactly 2 inches taller, I know I will not get it exactly like it was but I was considering a going to 3.73's. Will they fir with my current carrier in my front diff? The rear diff should be fine. Any info would be greatly appreciated.
    Thanks
    Blu
    If this truck is 4 wheel drive you need to change both fron and rear to match. I wouldnt go any more than 3.23 with that size tire.


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  3. #3
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    Default

    This chart may help guide you as well.


    http://www.4lo.com/calc/geartable.htm


    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

  4. #4

    Default

    SS, yes the truck is 4wd and since I was talking about concerns for the front diff should have been a give away ;). And you think a 3.23 gear is right? Or did you mean 3.73?
    Thank you fleetwood, the chart helps. But 1 concern, question I have is will I need to get a new carrier for the front diff will it all fit in the case?
    Since I have the 6 speed and reading the other posts about this I'm really considering going to the 4.11's and calling it a day

  5. #5

    Default

    Quote Originally Posted by bluavalancheZ71 View Post
    SS, yes the truck is 4wd and since I was talking about concerns for the front diff should have been a give away ;). And you think a 3.23 gear is right? Or did you mean 3.73?
    Thank you fleetwood, the chart helps. But 1 concern, question I have is will I need to get a new carrier for the front diff will it all fit in the case?
    Since I have the 6 speed and reading the other posts about this I'm really considering going to the 4.11's and calling it a day

    ya I want sure if you had a 4x4 since you were talking about keeping the rear the same.....with a 18 inch tire 4.11 may bring your rpm to high at freeway speeds.

    ---------- Post added at 08:37 AM ---------- Previous post was at 08:08 AM ----------

    I have 4.11 with 32 inch tall tires..at 65mph my rpms at 65mph are 2200 , at 85 they run 2500rpm.


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  6. #6

    Default

    I have 4.10's with 34.5" tire and at 60mph I'm turning 1,900 rpm's. My tach says 2,100 but may scanner says 1,900 rpm's . I go with the scanner because every factory tach is like a factory speedo, there off a little.

    ---------- Post added at 11:02 AM ---------- Previous post was at 11:01 AM ----------

    Also, welcome to the club.
    :cool:

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.
    :glasses:

  7. #7

    Default

    Wait..i mis read your post..how tall
    is the new tire?


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  8. #8

    Default

    New tires are 33.6 tall stock were 31.6 so a 2 inch increase in height

  9. #9

    Default

    I would go with the 3.73 for MPG's or the 4.10's for a little more power off the line.
    :cool:

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.
    :glasses:

  10. #10

    Default

    Ok...4.11 or maybe even 4.56 would be ok..... 4.11 for sure.


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