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4.88 gears for 295/70/18?

Discussion in 'Performance and Tuning' started by yoneytan, Jun 4, 2018.

  1. Jun 4, 2018 at 10:16 PM
    #1
    yoneytan

    yoneytan [OP] New Member

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    I have Toyo OC 295/70/18 and my truck feels sluggish out of the hole. Will 4.88 gears take care of that? My 07 with factory platinum 20's(wheels/tires) felt so much better off the line.
     
    Rica25 likes this.
  2. Jun 4, 2018 at 10:49 PM
    #2
    zcarpenter92

    zcarpenter92 Yotas and Yellow Jackets

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    Most likely, I personally don’t think mine’s too sluggish. But it will return the gear ratio to stock levels.
     
  3. Jun 4, 2018 at 10:54 PM
    #3
    TheBeast

    TheBeast The Beach

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    don't fell mine is sluggish (AT2) are you running the M/T ? did you ever run other sizes on your new truck ? ECUs on gen 2 is tuned differently than gen3s.
     
  4. Jun 4, 2018 at 10:59 PM
    #4
    yoneytan

    yoneytan [OP] New Member

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    Only have the truck for a month. The truck had 20's with 33's when i bought it and drove like crap(shaking and humming like crazy).
     
  5. Jun 4, 2018 at 11:01 PM
    #5
    yoneytan

    yoneytan [OP] New Member

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    Tires are A/T's and the truck is a 14 with 80k miles. Engine seems smooth and tight, I don't suspect anything wrong with it mechanically.
     
  6. Jun 4, 2018 at 11:14 PM
    #6
    yoneytan

    yoneytan [OP] New Member

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    Searching the web for 4.88 gears I see prices ranging from $300-$1500(parts only). My truck is a 2wd, what can I expect to pay for gearing?
     
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  7. Jun 4, 2018 at 11:30 PM
    #7
    chphilo

    chphilo Tundra addict

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    It's the 'improvement' Toyota made to the 3rd gen Tundras. They made the acceleration smoother. If you want to feel the similar acceleration as gen 2, push the tow/haul button and see.

    (I have Trail Grappler MT in the same size and the power loss is really small)
     
    TheBeast likes this.
  8. Jun 5, 2018 at 12:13 AM
    #8
    Spolar

    Spolar Going broke

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    I would never spend money on gears for that tire size but it’s up to you.
     
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  9. Jun 5, 2018 at 4:30 AM
    #9
    Bo-Hunter

    Bo-Hunter I like fast

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    I'm running 4:88 gears in my 2017 Crewmax with 285 70 18 tires basically a 34" diameter so very similar to your 295's. It definitely brought back the pep from when it was stock and also brought my MPG's up. RPM's barley changed on the highway at 70mph's, truck is more responsive, what's not to like. The first thing I thought after doing it was why did I wait so long to do it. For me PERSONALLY knowing what I know now even if I ran 33's I would run 4:88's. I think I read somewhere that Keith @dirtydeeds ran or runs 4:88's with 33's and really liked it. I am working on a project truck now and as soon as I'm am finish with my suspension 4:88 gears are going in, I'm running 35's so for me it's a no brainer.
     
    Last edited: Jun 5, 2018
  10. Jun 5, 2018 at 7:58 AM
    #10
    yoneytan

    yoneytan [OP] New Member

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    I've tried the tow/haul and while its definitely a big improvement the throttle is way too sensitive. Makes it hard to have smooth take offs.
     
    lionix likes this.
  11. Jun 5, 2018 at 8:03 AM
    #11
    15whtrd

    15whtrd Mr. Blonde

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    TRD Pro suspension, +2 Coachbuilder shackles, 2015 TRD Pro headlights, 20% ceramic tinted windows, clear ceramic tinted front windshield, aFe drop in pro s dry air filter, TRD airflow accelerator, TRD oil fill cap, TRD 18 psi radiator cap, BDX Bullydog tuner, Weathertech floor mats front and rear, rear seat fold down mod, DNA hard trifold tonneau cover, Linex with uv protection, TRD rear swaybar, TRD center caps, TRD Pro grille insert with color matching surround and bulge, TRD PRO headlights, aluminum oil filter canister, Real truck tailgate seal, Pop-n-lock tailgate lock actuator, rear diff breather relocate, RCI front skid plate. 275/70 R18 BFG KO2s
    I’d love to have 488’s with my stock tires! I definitely recommend a re-gear. I stepped up from 3.55 to 4.11’s in my old pick up and it felt so much nicer.
     
  12. Jun 5, 2018 at 8:21 AM
    #12
    Lars

    Lars Trail Communicatons Expert

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    I'm contemplating 4.88 gears for my Rock Warrior. 315-70-17
    Just ordered the hypertech Speedometer calibrator last night.
     
  13. Jun 5, 2018 at 8:45 AM
    #13
    yoneytan

    yoneytan [OP] New Member

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    Anyone have an idea how much I should expect to pay for 4.88? My truck is a 5.7 2wd.
     
  14. Jun 5, 2018 at 8:47 AM
    #14
    Lars

    Lars Trail Communicatons Expert

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    I'd call East Coast Gear Supply and talk to them.

    On the Tacoma/FJ/4Runner platforms I know they'll swap out whole third members with re-geared third members.
    I'm not sure if that's free, or if there's a fee associated with it. I also don't know if they ship the re-geared third, and then have you ship back yours, or if you have to ship first. Easiest phone call ever though.
     
  15. Jun 5, 2018 at 8:50 AM
    #15
    831Tun

    831Tun heartless Bastrd

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    The throttle response is retarded (de-tuned) on the 3rd gens. I put a bully dog tuner on mine (with 35s) and that has the throttle feeling much better and more like my '07. On the freeway the truck, with these large tires, can't hold 6th like it should shifting on the slightest inclines. That's where I think the 4:88s would really make the difference IMO.
     
  16. Jun 5, 2018 at 9:16 AM
    #16
    UTTundra

    UTTundra New Member

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    I have 4.88's with 295/70/R18 STT Pros. It did help. I wouldn't say it put it back to stock as far as the sluggish feeling off the line, though. MPG on highway may have gone up 1 mpg. City, maybe .5 mpg if I'm lucky. RPM at 70 mph increased about 300 rpm. If you are 2wd, pretty sure you only have to do the rear diff, so that should save you some dough. I'm 4wd and I got a good deal on my gears ($900 for Nitro). $1000 for install on 4wd seems to be about average.

    I now have long tube headers, full 3" dual exhaust, and tuned by DAP. Feels strong now.
     
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  17. Jun 5, 2018 at 10:11 AM
    #17
    831Tun

    831Tun heartless Bastrd

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    Does it hold gears better on inclines? I'm considering re-gearing but it's expensive if it doesn't help with holding 6th on a slight incline. I'm also running a slightly taller tire, 305 70 18
     
  18. Jun 5, 2018 at 10:29 AM
    #18
    rarce19

    rarce19 New Member

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    My local shop recommended 4:88s when running tire sizes over 35. They said 4:88s would be excessive on anything smaller and it would be reving all crazy. Not sure how true this is but just sharing what I was told.
     
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  19. Jun 5, 2018 at 10:50 AM
    #19
    Tundradrenalin

    Tundradrenalin New Member

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    Keith has 4.88's on his 1Gen.
    I had 4.56's on my 4wd 1Gen with 285/70/17's. It was a little rocket ship.

    Your re-gear with just the rear diff will be much cheaper since you just have one R&P do swap out. Expect to pay about $400-600 for labor on the install.

    What's your current gearing?
     
  20. Jun 5, 2018 at 10:50 AM
    #20
    UTTundra

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    It's hard to say. On smaller inclines, I never really noticed a problem with shifting before re-gearing. On medium to large hills, it still shifts down to 5th/4th. I live in a fairly hilly/mountainous region, so someone with flatter terrain might have a different experience. For me, the most noticeable improvement with re-gearing was with acceleration from a standstill. And yea, if you have a taller tire than me (mine are 34.4" according to Cooper), you might notice a bigger improvement. In my experience, it was a helpful but not a miracle-mod.
     
    Broncobroke and 831Tun[QUOTED] like this.
  21. Jun 5, 2018 at 1:33 PM
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    yoneytan

    yoneytan [OP] New Member

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    Currently stock with what I believe is 4.30. I was quoted $1100 parts and labor using G2.
     
  22. Jun 5, 2018 at 1:45 PM
    #22
    Grumpy Uncle

    Grumpy Uncle Pushing string down the hall SSEM #10

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    I can tell that, yes it does hold 6th a lot longer on the hills or instead of dropping 2 gears it'll only drop one on the steeper or longer hills. For me it was worth the coin. I'm running 35's.
     
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  23. Jun 5, 2018 at 1:49 PM
    #23
    mudslinger79

    mudslinger79 New Member

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    I'm going 4:88 on my 1st gen with 295-75-16 AT2's. They measure out to be a little over 33 inches. I could tell a difference from the 275-65-18 tires I had. Definitely worth it. It's on my list right after my suspension upgrades.
     
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  24. Jun 5, 2018 at 1:50 PM
    #24
    831Tun

    831Tun heartless Bastrd

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    Thanks Pat. It seems like it would but I haven't really heard any input on the subject. With the tuner my acceleration is fine, I would just like it to hold the gears longer which I assume would yield better MPG.
     
  25. Jun 5, 2018 at 2:03 PM
    #25
    Grumpy Uncle

    Grumpy Uncle Pushing string down the hall SSEM #10

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    Personally I would say it is a little better than before, as far as mileage is concerned. I dont want to start a pecker measuring contest. I can tell you just getting back to the OEM power bands was well worth it. Just having enough in 6th gear without down shifting when passing on the interstate or the constant 4th through 6th gear changing in the mountains was worth it.
     
  26. Jun 5, 2018 at 2:21 PM
    #26
    alpinepro4

    alpinepro4 What is your MPG Today!

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    Have looked into a DAP tune. Changes the shift point for better, and takes off your torq management. Sherk can also make changes by your mods(tires).
    I run a DAP tune and it made a difference.
     
  27. Jun 5, 2018 at 3:02 PM
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    mudslinger79

    mudslinger79 New Member

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    DAP hasn't developed a remote tune for the 4.7 as of yet. Next year, if things go my way, I taking my son and we're going to Texas for a day of R&D tuning on my truck. Plus, it'd be a hell of a road trip.
     
  28. Jun 5, 2018 at 3:07 PM
    #28
    UTTundra

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    I don't think he can adjust the speedometer for tire size. I use the Hypertech calibrator. Easy to install, but had to mess with the settings to get an accurate speed.
     
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  29. Jun 5, 2018 at 5:04 PM
    #29
    dirtydeeds

    dirtydeeds Exhaust Fabricator Vendor

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    Running 4.88 on 31’s I get 17mpg on the highway. But 33’s on stock gearing gets 11 on the highway.

    Steeper gears make for better mpg. Unlike back in the day when it was the opposite.

    And you get that pep hack in your step!!
     
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  30. Jun 5, 2018 at 5:51 PM
    #30
    Berettafan

    Berettafan New Member

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    Absolutely.

    It’s not popular here because there is an awful lot of posing going on and show means more than go. On jeep forums rehearing is considered job one when going up in tire size.

    ECGS is the place to call.

    Labor probably in the $300-$400 range for one axle depending on who you use.
     

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