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3.73 Gear Ratio swap

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Cappy Cap, Nov 2, 2009.

  1. Nov 2, 2009 at 4:53 PM
    #1
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    Hey guys... I posted something about gear ratios before. I was curious i was looking to upgrade and do alot of highway driving. I think 4.11 might be too high for my 2.7l 5 lug taco. Will a 3.73 out of a prerunner work like from the dealer or are they like an 8? i have a 7.5 - 3.31, does anyone make a 3.73 or similar? :cool:
     
  2. Nov 2, 2009 at 5:00 PM
    #2
    sachou

    sachou Well-Known Member

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    You're really going to have to post your tire size for anybody to be able to help you.
     
  3. Nov 2, 2009 at 5:04 PM
    #3
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    my tire size is 28.9 ~ 29", in the future plan to goto 31".
     
  4. Nov 2, 2009 at 5:08 PM
    #4
    sachou

    sachou Well-Known Member

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    My 4x4 came stock with 265/75R15 tires, which are basically like 31's, and came with 4.10 gears.

    I bought it with 32's on it, and am not very happy with the lack of power mostly because of the 2.7 liter.

    I'm too much in the gray area between getting 4.56's so I won't, but would like to...

    I think i'd like my 4.10 gears a lot better if I was running the stock 31's.
     
  5. Nov 2, 2009 at 5:21 PM
    #5
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    Really, i called a shop today and they told me that puttin 4.11 on my truck would make the truck "scream" in his words. When your on the hghwy what are rpms say at 80. ive been doin the calculations and it comes out to 3000 rpm. if i went to 3.73 it would drop to like 2,750 arounf there.
     
  6. Nov 2, 2009 at 5:23 PM
    #6
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    ooo im sorry i misread, you would like your 4.10 with a stock 31"
     
  7. Nov 2, 2009 at 7:34 PM
    #7
    06dak

    06dak Well-Known Member

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    All Prerunner/4x4s come stock with the 4.10s on 245/75/16s. I run about 2700RPM at 75mph on the freeway, get 21~23mpg combined without having to baby it.
    It runs with good power, but first is a bit useless (you almost shift before you get through an intersection) and I've wondered how it would be with 3.73s. I think you should try it and report back to me! :) That is, if the 5 lug and 6 lug rears are the same...

    One other thing to consider, you could probably find the V6 3.73s used all around as people upgrade theirs. The 4.10 are harder to find!
     
  8. Nov 2, 2009 at 9:54 PM
    #8
    afd23a

    afd23a Well-Known Member

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    I'm waiting on a 3.73 ring and pinion that I plan to put in my 5 lug. I am currently running 30x9.5 tires and in the future would like to run 245/75/16 tires. My calculations using this calculator, indicated that 3.73's would be very close to stock when running 245/75/16. So I found a set and I'm planning on putting them in early next year. I've read rumors that the third member housing is different for the 3.31 and 3.15 ratios. So I'm not 100% sure if these will fit. I was wanting to find a complete third member to swap out, but the deal on the ring and pinion was too good to pass up.
     
  9. Nov 3, 2009 at 12:10 AM
    #9
    rossk35

    rossk35 Do Work Son!

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    Since you have a 5lug you can NOT use any 3rd member from the 6lug prerunners. You have a 7.5in rear end whereas the 6lugs have a 8.4in rear end.
     
  10. Nov 3, 2009 at 6:24 AM
    #10
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    thank you that is what i was trying to figure out. Where can i get a 7.5" 3.73 ratio? Most shops say this is a dealer size ratio and they dont offer or make one of that nature. Afd23a Where did you get your 3.73 ratio for your 5 lug?
     
  11. Nov 3, 2009 at 7:47 AM
    #11
    afd23a

    afd23a Well-Known Member

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    I acquired the gears from a 4wd that had regeared.

    There seems to be some debate/misunderstanding over the size of the rear end in the 2nd gen 5 lug. In my research I have found that it uses an 8 inch ring gear like the 4wd and non locking prerunners (referred to as the 8.4" differential). This is not to be confused with the 8" elocker.

    Several other 5 lug trucks have regeared or swapped thirds with no problems. My understanding is that the 7.5" is used in some of the 1st gen tacomas and the 8.4" is used in all non-locking 2nd gen tacomas.

    Here's a thread with some folks who have done 2nd gen 5 lug gear swaps: http://www.customtacos.com/forum/showthread.php?t=116684&highlight=member


    I must also state that I do not have the 3.73 gears yet, so an attempt has not been made to actually put them in. Therefore I don't have first hand knowledge that they will fit.
     
  12. Nov 3, 2009 at 8:05 AM
    #12
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    Wow, ok. So from what i read from your post and the link it sounds like the 08 5 lug has a 8.4" rear. If that is the case then it will be a little easier finding the right parts for that than the 7.5". Let me know how your process goes as i will be looking to do this very shortly, i am also going to call a dealership and toyota to find out exactly what the XXXX i have
    Thanks again
     
  13. Nov 3, 2009 at 8:13 AM
    #13
    afd23a

    afd23a Well-Known Member

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    That thread should apply to all of the 2nd gen (+05) 5 lugs. I probably won't do the swap until after the new year. Funds are getting tight around Xmas time. I tried calling my local dealer to find out the size of ring gear, but they weren't very much help. Hopefully you'll have a different experience and let us know if they tell you anything useful.
     
  14. Nov 3, 2009 at 2:48 PM
    #14
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    Can you please tell me where you got that info, i would like to know what i have so i can figure out my new gears accordingly. If it is from a chart i do not think that it's accurate because some chart said i have 3.15 which is not accurate
     
  15. Nov 3, 2009 at 3:07 PM
    #15
    DanGer

    DanGer Avatar approved by 98tacomav6

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    FWIW the rear end is actually 8" but named 8.4 because it is beefier than the previous 8" toyota rear end
     
  16. Nov 3, 2009 at 3:55 PM
    #16
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    5 lug tacoma has a 3.31 ratio
    what does the 8.4" or 7.5" refer to?
    5 lug taco has an 8
     
  17. Nov 3, 2009 at 4:00 PM
    #17
    afd23a

    afd23a Well-Known Member

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    It's refers to the diameter of the ring gear. However, what is referred to as the 8.4" actually measures 8".

    +05 5 Lug Taco Gear Ratios
    3.15 for Xrunners
    3.31 for the manual transmission (non Xrunner)
    3.58 for the automatic transmission (non Xrunner)

    There should probably be a sticky for the various gear ratios and ring gear sizes that were available for each model of the Tacoma.
     
  18. Nov 3, 2009 at 4:53 PM
    #18
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    o i c so i have an 8.4" which is compatible with other tacomas so i can get a 3.73 ratio from other tacomas. How come when shoppng around they only have an 8 available and dont mentionthe 8.4"?
     
  19. Nov 3, 2009 at 4:54 PM
    #19
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    ok im a little late on these replies:mad:
    sorry both that
     
  20. Nov 3, 2009 at 5:15 PM
    #20
    Cappy Cap

    Cappy Cap [OP] Well-Known Member

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    Now comes the question where can i get a set of 3.73???
     
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