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Thread: I found the solution to the B20A "RARE" transmission.

  1. #1

    carotman's Avatar
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    I found the solution to the B20A "RARE" transmission.

    That's right. I found THE solution to the B20A "RARE" transmission.

    We all know that the B20A can be somewhat easy to find but finding the 5 speed transmission can be a real challenge.

    I've noticed that the B18A (The B20A little cousin) has a transmission configuration really similar to the A20A. I've been wondering for some time if the B18A transmission is similar to the A20A. Well, it turns out it shares the same transmission case and cover.

    I checked my JDM parts catalog today and compared part numbers with the B18A.

    Here are some relevant part B18A numbers:

    Transmission case: 21200-PC8-J52
    Transmission end cover: 21310-PC8-961
    Transmission end cover gasket: 21395-689-000
    Oil Seal: 91206-PC8-003
    T/O Bearing: 22810-PC8-921
    Mainshaft: 23211-PC8-J30
    Countershaft: 23220-PC8-671
    Fork, Low Gearshift: 24221-PC8-920
    Differential Case: 41310-PC8-621

    ALL, and I mean ALL these parts can be cross referenced at your local Honda dealer in North America. These parts are all from the JDM B18A transmission that WILL bolt up to the JDM B20A engine.

    You can look for yourself by entering the part numbers here: www.slhondaparts.com

    So far, I realized that all you need to install an A20A transmission on a B20A is the B18A bell housing. That thing can easily be had from New-Zealand or any other country that had JDM imports.

    Of course, the A20A transmission has longer gears but you can always use the 1st gen Integra internals and you'll get a transmission that's really similar to the B2K5 or F2K5 from the JDM B20A.

    There "might" be some differences that would not work but so far, every part matches, even the bearings and seals. All you would need to do is get that B18A bell housing, install it on your A20A transmission, use the A20A clutch and you're on!
    Last edited by carotman; 01-19-2015 at 09:31 AM.

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    3geez member since July 12 2000

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  2. #2
    3Geez Veteran ghettogeddy's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    nice make sure bullurd sees this so he dosent sell his motor

  3. #3
    3Geez Veteran A18A's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    fugging awesome one carotman :D :D :D :thumbup:

  4. #4
    3Geez Veteran BITESIZE's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    That's indeed an uber good find! Kudos!

  5. #5
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    re: I found the solution to the B20A "RARE" transmission.

    I think I deserve a beer now, don't I?
    :cheers:

    good job figuring this out c-man :thumbup:


    [edit: and why not smilies here :(]

  6. #6

    carotman's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    I noticed that even the B18A AND B20A auto tranny has the same case as the A20A auto tranny... This means only the bellhousing is different between the A20A and B18A/B20A auto trannies.

    So, if you have a low miles B20A auto tranny, don't throw it in the garbage, they are of some use for the guys here that blew their A20A trannies.

    I'm glad I kept my B20A tranny :p

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
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  7. #7
    3Geez Veteran MessyHonda's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    time to give steve_si a call....

    1989 Honda Accord LX-i
    B18c1 swap since 7/2011
    175whp and 132tq
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  8. #8
    LXi User Steve_Si's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    So can you confirm that all I need to send Bullard123 is the bellhousing? If so I can take the rest to the metal recycling centre.

    Also, will the bellhousing from an auto B18A transmission be useful to those with a manual transmission from an A20A?

  9. #9

    carotman's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Hmm. I'll have to compare every single part to comfirm that it's 100% the same. Give me an hour and I'll be able to do it I guess. 3geez is worth more than an hour of my time hehe.

    And yes, the B18A/B20A auto bellhousing is all you would need to install an A20A auto tranny to a B20A.

    Edit: Well, I just thought about something

    IF the mainshaft, countershaft, differential, shift forks and bearings are the same, the A20A tranny will work with a B18A bellhousing.

    I compared the gears and they come up on www.slhondaparts.com...

    Great news.

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
    https://www.3geez.com/forum/showthread.php?t=67742

  10. #10
    3Geez Veteran BITESIZE's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    ^^^You are 3geezus!

  11. #11

    carotman's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Steve (or anyone from NZ)

    If you come by any DEAD B18A tranny, this is worth GOLD for us guys in North America. You can probably sell the bellhousing alone for 3 times the price of the dead tranny :p

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
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  12. #12
    Accord of the Year - 2007

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    re: I found the solution to the B20A "RARE" transmission.

    Im sorry, but is this an april fools joke?
    Complete repair manual <---- (click here)


  13. #13

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    re: I found the solution to the B20A "RARE" transmission.

    Hmmm I hope you are right Carotman. Cause I didn't want to run into anymore surprises lol. I knew I was on to something when my stage1 clutch from my A20 bolted up directly to the B20A. Thanks for completing the rest of that research too. It seems something good always comes out of a bad situation. Now we can see more B20a geeez riding around. And Steve I'll be looking forward to your Pm with the costs.

  14. #14

    Ichiban's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    I wonder if advance adapters or downey would cast us more B18A bellhousings if we sent them one and asked for copies?
    ICHIBAN!
    "Now, even more better!"

  15. #15

    bullard123's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Oh and this thread should be a sticky Carotman :)

  16. #16

    carotman's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Oh, one more thing, you'll probably still need the B18A rear bracket to go with the bellhousing. The bracket doesn't cross reference with the A20A

    You'll need the flywheel cover too.

    http://pages.videotron.com/omus
    3geez member since July 12 2000

    I need these parts!
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  17. #17

    bullard123's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Alright Thanks. I hope Steve Si see's this too

  18. #18


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    re: I found the solution to the B20A "RARE" transmission.

    Great Job!

  19. #19
    SEi User ZackieDarko's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    good god i hope this isnt an april fools joke

  20. #20

    bullard123's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    Quote Originally Posted by carotman
    Oh, one more thing, you'll probably still need the B18A rear bracket to go with the bellhousing. The bracket doesn't cross reference with the A20A
    You'll need the flywheel cover too.
    Hey Carotman shouldn't the rear bracket and flycover from a B20a tranny work?? Steve might have a hardtime trying to find another B18 5 speed donor car because I'm sure the flywheel cover isn't on the tranny right?

  21. #21
    3Geez Veteran ghettogeddy's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    who really needs a flywheel cover i havent had one on mine for like a year at least lol it hasent made a dif at all

  22. #22
    3Geez Veteran A18A's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    cant ya just make one with some cheap metal anyway?

  23. #23
    LXi User L3G10N's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    So Carot, are we going back together next week buying all the B20A lying down in the JDM shop? lol They almost all have automatic tranny :)

    My Baby; Honda Accord 86 S, B20A JDM
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  24. #24
    Accord of the Year - 2006

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    re: I found the solution to the B20A "RARE" transmission.

    Good find Carot!

    Glad to see ur still out there diggin up info for the rest of us. Makes we want to pick up a b20 and swap all my stuff over :D

  25. #25

    carotman's Avatar
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    re: I found the solution to the B20A "RARE" transmission.

    I guess the B20A rear bracket will work. I'll check that later tonight.

    Legion, we'll buy the "useless" B20A auto trannies for like 50 bucks at the importers :D

    http://pages.videotron.com/omus
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