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35" Tires And Overdrive

Discussion in 'General Tundra Discussion' started by ZPMAN, Dec 29, 2017.

  1. Dec 29, 2017 at 9:39 AM
    #1
    ZPMAN

    ZPMAN [OP] 2nd place is the 1st looser

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    John
    Minnesota
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    2016 Black Platinum Supercharged
    4" lift, 35s, Magnuson Supercharger
    Took a vacation drive to Austin this summer not long after installing the new rims/tires. On the day I left my hypertec Speedo calibrator came in and did not install.
    When driving 75/85 the cruise had a hard time holding it in OD after climbing any small hill. When i got to Austin I installed the hypertec and it made no difference. The way I was able to keep it to stay in OD was to move the shifter to manual, bump it to 6th then it had no problem staying/going back into OD after downshifting.
    Any vet thoughts would be appreciated.
     
    Throwwire and Grumpy Uncle like this.
  2. Dec 29, 2017 at 10:05 AM
    #2
    UTTundra

    UTTundra New Member

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    Lou
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    Have you thought about re-gearing? The hypertech won't affect anything here as far as RPMs or shifting. All it does it take the MPH input the vehicle is giving it and covert that to the MPH you see on the dash based on what tire size you entered in the software. Although, it should also make your odometer more accurate.
     
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  3. Dec 29, 2017 at 10:24 AM
    #3
    ZPMAN

    ZPMAN [OP] 2nd place is the 1st looser

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    Yes I believe the hypertec is doing it's job (no tickets), just wonder why when it's in Manuel shift it will go back to overdrive no proplem. As for re-gearing I think that 4th gen will be out soon.
     
  4. Dec 29, 2017 at 10:27 AM
    #4
    T-Rex266

    T-Rex266 Independentoffroad who? That's cute. Staff Member

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    When you’re on cruise, it’ll be hunting gears to maintain the desired speed up hill. Most vehicles, especially with stock gearing and oversized tires will do this. I never use cruise.
     
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  5. Dec 29, 2017 at 10:28 AM
    #5
    UTTundra

    UTTundra New Member

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    My truck does that too occasionally when I shift out of D and put it into S6. Not every time, though. When I say re-gearing, I mean going to a 4.88 gear ratio. That is likely the best way to solve your issue of your truck dropping out of OD. Not exactly cheap, though.
     
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  6. Dec 29, 2017 at 10:30 AM
    #6
    ZPMAN

    ZPMAN [OP] 2nd place is the 1st looser

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    4" lift, 35s, Magnuson Supercharger
    Roger that, but it will go back into OD when in manual when using cruise.
     
  7. Dec 29, 2017 at 10:34 AM
    #7
    ZPMAN

    ZPMAN [OP] 2nd place is the 1st looser

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    4" lift, 35s, Magnuson Supercharger
    Roger that on the 4.88s, would have done with a SC but the wife keeps me in check.
    If after it downshift for incline it will not go back to OD unless you have a slight decline, take the cruise off or putt it manual s6.
     
    Last edited: Dec 29, 2017
    Throwwire and Grumpy Uncle like this.
  8. Dec 29, 2017 at 12:22 PM
    #8
    AxelsHumanDad

    AxelsHumanDad I am Groot

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    Mike
    KAIG, NW of The Frozen Tundra
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    Some suspension tweaks
    Same exact situation I had rolling north and south the length of Illinois with the lifted truck I owned. Constant in and out of OD or just holding in direct with any puff of wind. I was able to do the same bump shift to get it to settle down a little. I have no solution to offer, I traded that truck, just noting you aren't alone.
     

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