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Another M2B4 Gear Swap Question...

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    #1

    Another M2B4 Gear Swap Question...

    I noticed that someone on Honda-Tech.com, Gear Swap, swapped the 5th gear from a F23 transmission into a H23 transmission. I also noticed that he used the M2S4 which is a USDM transmission, and the F23 transmission he used was also USDM. I believe this worked out fine for him, and I've been considering this idea for a really long time.

    Here's my question(s). Will this same idea work with a JDM M2B4 transmission swapping in our H2U5 5th gear into the M2B4 gearing line-up? I know the USDM and JDM transmission cases are different, but beside having to machine down the H2U5 5th gear to fit properly, will the H2U5 5th gear fit in the M2B4 transmission without causing any problems while keeping the original 1-4 gears and final drive on the M2B4?

    Edit: ...or is this all just theory and I need to do the R&D. While at the SAE shop at school later on, I'll take some measurements if no one has definite answers.
    Last edited by Straight Success; 01-21-2011, 11:11 PM.
    The Lord watches over me!

    "Stop punching down on my people!!!"

    - D. Chappelle
    Tags: None
    #2
    I haven't read much about people modifying the M2B4 because the aftermarket doesn't support it as much. Do you already have this tranny?

    If not, I suggest just looking into a regular base model h22 tranny (M2y4??) and adding the MFactory Final Drive 4.64 or 5.2 with the accord 5th gear machined down. Compliment that with the MFactory LSD or similiar.

    If you do, there's a lot of people out there looking to buy an M2B4 trans for what it is, no mods. Sell it and build your own to suit your needs.
    Last edited by wherm; 01-20-2011, 07:32 PM.


    http://www.cb7tuner.com/vbb/showthre...=1#post1823428

    My Custom BB6 Dash Swap Thread

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      #3
      .
      Last edited by BadgerType; 01-24-2011, 11:15 AM.

      174.92 BHP / 171.45 WTQ

      Comment

        #4
        Originally posted by wherm View Post
        I haven't read much about people modifying the M2B4 because the aftermarket doesn't support it as much. Do you already have this tranny?

        If not, I suggest just looking into a regular base model h22 tranny (M2y4??) and adding the MFactory Final Drive 4.64 or 5.2 with the accord 5th gear machined down. Compliment that with the MFactory LSD or similiar.

        If you do, there's a lot of people out there looking to buy an M2B4 trans for what it is, no mods. Sell it and build your own to suit your needs.
        I just read the thread created with all the info inside. I didn't buy the transmission yet because I'm not sure which route to take. I am liking the idea of mating the H2U5 to the JDM H22a and adding the LSD and possibly the 4.64 final drive, or the M2Y4 with a H2U5 5th gear and a different final drive. I have some more to think about.

        Originally posted by BadgerType View Post
        i do know the f23 5th will swap in w/o modification into the usdm one and i don't see why the jdm m2b4 gears would be different, but i could be wrong about jdm tranny
        I'm not sure, and I think others would like to know this information as well.
        The Lord watches over me!

        "Stop punching down on my people!!!"

        - D. Chappelle

        Comment

          #5
          I know for a fact that the .812 M2S4 (Si) 5th gear will not go into a USDM M2F4 (SiVTEC) without modification. I tried it 6 years ago.

          However, I do know for a fact (personal experience) that the JDM LSD .787 M2B4 5th gear will swap with the M2F4.

          So by extension, the F23 5th gear, if swapable with the .812 M2S4 5th will not swap with the M2B4's 5th without modification. Or to put it another way:

          A ≠ B, B = C, therefore A ≠ C

          -P
          VTEC G27? = ???whp ???wtq
          VTEC G23 = 220whp 191wtq
          nonVTEC G23 = 200whp 183wtq
          K24 iVTEC hybrid = 260whp 210wtq

          Comment

            #6
            Originally posted by PirateMcFred View Post
            I know for a fact that the .812 M2S4 (Si) 5th gear will not go into a USDM M2F4 (SiVTEC) without modification. I tried it 6 years ago.

            However, I do know for a fact (personal experience) that the JDM LSD .787 M2B4 5th gear will swap with the M2F4.

            So by extension, the F23 5th gear, if swapable with the .812 M2S4 5th will not swap with the M2B4's 5th without modification. Or to put it another way:

            A ≠ B, B = C, therefore A ≠ C

            -P
            Thanks for that info. It's greatly appreciated, and much needed.

            On another note, if B = C (B = M2B4, C = M2F4), then I need to find out if C's 5th gear is compatible with D's 5th gear without major modification (D = H2U5). If so, that's going to be my setup.

            M2B4 with a H2U5 5th gear. Do you PirateMcFred have a thread or info about what you've done with the transmissions in the past?
            The Lord watches over me!

            "Stop punching down on my people!!!"

            - D. Chappelle

            Comment

              #7
              Dang I wish I new more abour ratio's. I feel really lost sometimes on this forum.

              I understand what your tryin 2 do. Swapping a f23 5th gear in a jdm h22 trans.


              What's diff with the 5th gear from the usdm f22a tranny and usdm f23 trans. Is it longer?
              **Blk Housed Slut Crew Member #1**

              **Don't b scared be prepared for the worst**
              Da Drizzle's Sedan - Dr. Diy's Blk Housed Thread
              '90 2Tone Coupe-Car Heaven_'89 Lude-Junk Yard
              Mostly Usdm, some Jdm,Edm,&Puerto Rican RICE

              Comment

                #8
                Originally posted by F20A CB7 View Post
                Dang I wish I new more abour ratio's. I feel really lost sometimes on this forum.

                I understand what your tryin 2 do. Swapping a f23 5th gear in a jdm h22 trans.


                What's diff with the 5th gear from the usdm f22a tranny and usdm f23 trans. Is it longer?
                Yes. I would like to swap a F22 transmission 5th gear from a '93 EX transmission into a JDM H22 LSD transmission for highway driving. I want to keep the JDM H22 LSD transmission 1-4 gears inside the trans., and put in the 5th gear from a USDM F22 trans. into the mix. This way gears 1-4 will give me the quicker acceleration for racing (quarter mile or so), and I can use the longer 5th gear from the USDM trans. for highway driving or long stretches of road to save on gas.

                M2B4 = racing.
                H2U5 = economy.

                Take H2U5 5th gear, and put it into M2B4.

                M2B4 w/ H2U5 5th gear = gears 1-4 for racing, and 5th for high way crusing.

                Info about transmissions, ratios, and gearing.

                EDIT: I believe that the f23 5th gear is longer than the f22 5th gear. If so, I can't locate the ratios for the f23, then I'll be using the f23 5th gear.

                Sorry for this misinterpretation in the thread. I have access to the f22 5th gear now, but if a f23 5th is longer, I'll use that.

                EDIT (2): They are both 0.685 for the 5th gear. The f23 manual trans. and the f22 manual trans. have the same e 5th gear.
                Last edited by Straight Success; 01-22-2011, 01:50 AM.
                The Lord watches over me!

                "Stop punching down on my people!!!"

                - D. Chappelle

                Comment

                  #9
                  Originally posted by Straight Success View Post
                  Do you PirateMcFred have a thread or info about what you've done with the transmissions in the past?
                  I do not.
                  VTEC G27? = ???whp ???wtq
                  VTEC G23 = 220whp 191wtq
                  nonVTEC G23 = 200whp 183wtq
                  K24 iVTEC hybrid = 260whp 210wtq

                  Comment

                    #10
                    Not anywhere in that thread posted above do I see anything about an H2A5 tranny I have one of those trannys on my H22. When I get the chance I will post speed/rpm and the gear ratios for that tranny!
                    The CB7 Collector.
                    Team Kindred Impulse Member #3
                    92 LX Coupe F22A1
                    2013 Toyota Corolla S
                    92 EX Sedan F22A1
                    Originally posted by deevergote
                    Do you really need to make a thread asking if having your car like this /---\ will cause uneven tire wear? Try walking like that for a few weeks and see if your shoes wear funny! (hint: they will.)

                    Comment

                      #11
                      Originally posted by PirateMcFred View Post
                      I know for a fact that the .812 M2S4 (Si) 5th gear will not go into a USDM M2F4 (SiVTEC) without modification. I tried it 6 years ago.

                      However, I do know for a fact (personal experience) that the JDM LSD .787 M2B4 5th gear will swap with the M2F4.

                      So by extension, the F23 5th gear, if swapable with the .812 M2S4 5th will not swap with the M2B4's 5th without modification. Or to put it another way:

                      A ≠ B, B = C, therefore A ≠ C

                      -P
                      whoops, i will admit i did make a mistake. i confused the h23 with the jdm h22 tranny codes. i retract my statement. good catch PMF

                      174.92 BHP / 171.45 WTQ

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