Gears or tune?

Discussion in 'Engine & Performance' started by Cedward, Nov 23, 2016.

Sponsored By: Black Bear Performance
  1. Cedward

    Cedward GMFS Member

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    Hello Gents,
    I have a 2007 NNBS sierra 4.8L 2wd with 285/70r17s (stock was 245s) running 3.73 rear gear ratio. Since I've had the tires, the truck has just been sluggish and not much get up and go. Can't really even chirp the tires unless it's wet and seems like I've lost a lot of low end torque due to the weight of the tires. Not that I want to roast the tires but I would like to have that torque/power back.

    I know a lot of you guys use BBP tunes but I'm in Ohio and not really near any of the sites. If I regear, I would do it myself. Was thinking maybe 4.10s. Also was trying to contimplate whether or not a programmer would be worth it. If so, which would you guys recommend so I can change shift points and really tune it up?

    Have done a lot of reading on all of the options I think but it's a lot to process and you guys seem to know these situations by the backs of your hands. Thanks in advance for any and all help.


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  2. GREENSIERRA

    GREENSIERRA GMFS Member

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    you will need a tune to fix the speedo so do the tune and then do the gears.
    I would shy away from a hand held programmer and go straight to a custom tune from someone like black bear. they can send you a traditional tune or you can get a auto cal and send data logs to get it dialed in even better.
     
  3. Loudandproud

    Loudandproud GMFS Member

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    You won't feel that much of a difference going to 4.10s... I say go 4.30 and tune or leave the 3.73s and just get a custom tune because your tire isn't that big.
     
  4. Tiki

    Tiki meow

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    4.30s or 4.56s, and then you'll need a tune so...
     
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  5. Cedward

    Cedward GMFS Member

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    What would I need then for them to send me a tune? Not really familiar with the process. Never been involved with one. I feel like the auto cal is a good option but looks pricey. I think a traditional tune would do it. And what are rough prices for those tunes?

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  6. Loudandproud

    Loudandproud GMFS Member

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    You send your pcm to them and tell them what you want
     
  7. Tiki

    Tiki meow

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    Look for a local teputable tuner
     
  8. PHATDAN420

    PHATDAN420 GMFS Member

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    Id say get a good tune before the gears. You already got 373, if you would of had the 342 then i would be all the gear swap..


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  9. Cedward

    Cedward GMFS Member

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    I guess the reason I was contimplate gears was because when I get new tires I was gonna try and get 315s

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  10. Loudandproud

    Loudandproud GMFS Member

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    If you go anywhere near a 34 or 35" tire then I would regear to 4.56 and tune since you have the 4.8. Anything less don't even bother gearing it. Get a custom tune, nice exhaust, and leave the 3.73s. You have the 6 speed tranny I'm assuming and a custom tune will really wake it up!
     
  11. Hogg

    Hogg GMFS Member

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    A 3.73 to 4.10 would be a waste, esp if you go to a taller tire. I went from 3.08 to 4.10's and it wasn't the gains I expected.

    peace
    Hog
     
  12. High School Goat

    High School Goat New Member

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    Big gears are the only way that 4.8 is going to feel like it has torque.
     
  13. Cedward

    Cedward GMFS Member

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    So do you guys typically use the scan cable tune from BB or traditional?

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  14. justinSS

    justinSS Preferred Vendor

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    With your modifications, either option should work out well. The scan cable tune will permit you to complete the crank relearn procedure on your own, whereas the traditional tune would necessitate you taking it somewhere for that quick procedure or having you send your ECM/TCM in to be tuned.
     
  15. Cedward

    Cedward GMFS Member

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    Alright, thanks for the tips guys

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  16. GREENSIERRA

    GREENSIERRA GMFS Member

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    I have a auto cal and a v2, I log my data and send it to Justin so he can look it over.
    data logging helps get the tune spot on
     

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