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Regear questions

Discussion in 'Performance and Tuning' started by Cg13055, Nov 22, 2020.

  1. Nov 22, 2020 at 10:21 AM
    #1
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I want to put 4.88's in my truck, can someone explain what this will do? Does it raise shift points? I am trying to take some stress of the truck as my tires are very heavy for this small engine
     
  2. Nov 22, 2020 at 10:36 AM
    #2
    Wallygator

    Wallygator Well Zippedy Da Do!

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    Maybe I am wrong but if the tires are not larger I would think it would shorten shift points since the higher gears will cause the motor to rev out quicker.
     
  3. Nov 22, 2020 at 10:43 AM
    #3
    C.I.

    C.I. Surf, off road, sleep, repeat

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    what tires?
     
  4. Nov 22, 2020 at 10:45 AM
    #4
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I have 32.6" tires but they are really heavy tacomas usually need a regear from 31"-33" tires and with my engine I am assuming it's the same situation
     
  5. Nov 22, 2020 at 10:47 AM
    #5
    Wallygator

    Wallygator Well Zippedy Da Do!

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    Isn't that the stock size tire on the Tundra? What does the side wall say for size on your tires?
     
  6. Nov 22, 2020 at 10:52 AM
    #6
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    32.6" 265/70R18
     
  7. Nov 22, 2020 at 10:54 AM
    #7
    C.I.

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    I had 33's on my Taco (dbl cab) and didn't need regear.
    Tundras are heavier sure, but you shouldn't need regear on an almost stock tire.

    If you're towing I can see the benefits of 4.88 on the 4.0. Do you happen to know your stock gears? 4.10? 4.30?
     
  8. Nov 22, 2020 at 11:02 AM
    #8
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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  9. Nov 22, 2020 at 11:04 AM
    #9
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I have been told it is a 3.91 but also have seen a chart that says I am on 4.10's, having an issue with overdrive after the big lift where the RPM's get too low at too early of a speed around town because of the gearing. It's a OD issue my mechanic told me its normal because of the big tires, I feel it is an issue a 5.7 would experience with 35's
     
  10. Nov 22, 2020 at 11:04 AM
    #10
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    255 is stock but they are much lighter tires, these are heavy duty thick tires weigh 48 pounds each, I added alot of stress with these tires, I forgot what it is called but it is added weight to what the engine needs to move I definitely felt a big difference when I put these tires on
     
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  11. Nov 22, 2020 at 11:06 AM
    #11
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    The weight of these tires made a hugeee difference in the gas mileage and acceleration of this truck but It didnt have issues with the level kit, the big 4" lift kinda pushed it over the edge, I'm guessing with the weight distribution change it was just enough to be bothersome.
     
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  12. Nov 22, 2020 at 11:11 AM
    #12
    C.I.

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    #12
  13. Nov 22, 2020 at 11:11 AM
    #13
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I would be running at 5th gear 35-40 mph shifts too early when I don't need the overdrive gear
     
  14. Nov 22, 2020 at 11:13 AM
    #14
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I think I have a 7.5" ring gear the guys at 4WP sent me the invoice for 4.88's I can attach the info if you want
     
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  15. Nov 22, 2020 at 11:14 AM
    #15
    C.I.

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    ah.. silly me...

    7.5"? no way, Tacomas have 8.4 or bigger.
     
  16. Nov 22, 2020 at 11:15 AM
    #16
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I have cooper discoverer at3/4s These were a heavy duty tires rated for a much bigger truck like an f250 hence the big weight difference compared to other tires.
     
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  17. Nov 22, 2020 at 11:16 AM
    #17
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    give me a sec, let me pull up the invoice
     
  18. Nov 22, 2020 at 11:18 AM
    #18
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    upload_2020-11-22_14-17-52.jpg
     
  19. Nov 22, 2020 at 11:18 AM
    #19
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I called they asked what I wanted to move to which is a 4.88 and they rung it up for me.
     
  20. Nov 22, 2020 at 11:23 AM
    #20
    C.I.

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    7.5"... that seems insanely small for such a truck, the weight alone would stress the living crap out of that diff. Are you sure they're not thinking front diff?
     
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  21. Nov 22, 2020 at 11:25 AM
    #21
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    You've got me thinking... I spoke to them yesterday, they gave me a quote for a 4x4 and then when they realizes it is a 2x4 the price dropped 1K. Any idea how I can figure out the axle size? not sure if the dealership will run my vin today. Would be very annoying to have my truck at that shop any longer than it needs to be over a logistics error
     
  22. Nov 22, 2020 at 11:38 AM
    #22
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I am trying to figure out if I have the 10.5" giant ring gear... not too much info out there
     
  23. Nov 22, 2020 at 11:56 AM
    #23
    SC_TRD

    SC_TRD Big BASTRD 4x4 Enthusiast

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  24. Nov 22, 2020 at 12:04 PM
    #24
    C.I.

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    I can't seem to find ANY info on the V6. Nitro doesn't even consider the V6 in their gear sets :confused: however, they do make it quite clear the 4.6 and 4.7 v8's use a 9.5" rear... :annoyed:
     
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  25. Nov 22, 2020 at 12:05 PM
    #25
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    4.0L V6 DOHC 24V VVT-i 270 hp/278 lb-ft 5-Spd Automatic Trans w/Sequential Shift TripleTech Frame: Fully-Boxed Fr Section Reinforced C Under Cab, Open C Under Bed 3.909 Rear Differential w/9.5" Ring Gear Automatic Limited-Slip Differential Ind Coil-Spring High-Mounted Double Wishbone Front Susp w/ Stabilizer Bar Trapezoidal Multi-Leaf Rear Suspension w/ Staggered Outboard Mounted Shocks Power-Assisted 4 Wheel Disc Brakes 18" Styld Stl Wheels w/ P255/70R18 Tires (gave me more than enough, confirmed my suspicions on having the higher power V6 too. But the earlier guy was right i have a 3.91 gear )
     
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  26. Nov 22, 2020 at 12:06 PM
    #26
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I have a 9.5" rear end but I have a 3.91 instead of a 4.10:facepalm:
     
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  27. Nov 22, 2020 at 12:09 PM
    #27
    C.I.

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    well! thats good! now you know! I'd go with 4.30's (available at Nitro Gear), gives you some extra room for slightly bigger tires too without overkill.
     
  28. Nov 22, 2020 at 12:12 PM
    #28
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    Can I ask why you think 4.88 is overkill? I see alot of people put them on tacomas with small tires because the overdrive is too tall, My overdrive feels similar as its a 0.72, I did the math and I could do 70 on the highway at 2300ish rpm I usually dont drive faster than that when I am ever on the highway
     
  29. Nov 22, 2020 at 12:24 PM
    #29
    C.I.

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    4.88" is usually reserved for 35" and 37" tires; Toyotas have a very healthy low end and they're very efficient at delivering power to the ground, you want to keep it as close to stock as possible to avoid gear hunting.

    Look at this chart, its probably not the best for our trucks but it'll give you a good idea. My tundy cruises at 1500~1700 RPM @ 60-65 MPH on stock 4.10 (I think) and 33" tires, so yeah... chart doesn't do it for me as it is since I've done no test in 4th gear.... I just might when on my way home and share my findings.
    [​IMG]
     
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  30. Nov 22, 2020 at 12:27 PM
    #30
    Cg13055

    Cg13055 [OP] @yota.parts.distributor

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    I had my fair share of looking into these charts but I couldn't find one that applied to me, I only make 270 HP compared to a 5.7 that makes 380 the only good comparison is the 4.0 tacoma
     
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