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New tires, would like to regear to compensate

Discussion in 'Wheels & Tires' started by bluavalancheZ71, Aug 29, 2011.

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  1. bluavalancheZ71

    bluavalancheZ71 New Member

    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. sstoner911

    sstoner911 New Member 1000 Posts 100 Posts

    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.
  3. mfleetwood

    mfleetwood Moderator 1000 Posts 100 Posts

  4. bluavalancheZ71

    bluavalancheZ71 New Member

    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. sstoner911

    sstoner911 New Member 1000 Posts 100 Posts


    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.
  6. silveradotrailblazer

    silveradotrailblazer New Member 1000 Posts 100 Posts

    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.
  7. sstoner911

    sstoner911 New Member 1000 Posts 100 Posts

    Wait..i mis read your post..how tall[HR][/HR] is the new tire?
  8. bluavalancheZ71

    bluavalancheZ71 New Member

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

    silveradotrailblazer New Member 1000 Posts 100 Posts

    I would go with the 3.73 for MPG's or the 4.10's for a little more power off the line.
  10. sstoner911

    sstoner911 New Member 1000 Posts 100 Posts

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

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