[FAQ] How to: Identifying B series transmissions. - Honda-Tech - Honda Forum Discussion


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[FAQ] How to: Identifying B series transmissions.

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Old 04-30-2004, 07:31 PM   #1
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Default How to: Identifying B series transmissions.

In some cases trying to ID a B-series tranny is not always possible from it's external markings. So how can you tell?

This is what i have found to be the easiest method of doing so.

First you have to start off by taking the outer casing off. Fortunetly we already have a how to on that subject thanks to Plan B: How to: Take Apart a Transmission

Now that you have it apart. You can either go a step further and remove all the internals to be able to count every gear, or just get a tooth count on the final drive gear, it's opposing gear located on the counter shaft, and the upper most gears on both the counter and main shafts to calculate the transmissions 5th and final drive gear ratios.



Once you have counted how many teeth are on each gear, you need to divide the number of teeth on the counter shaft, by the number of teeth on the main shaft to find the gear ratio. I'll give you an example using the transmission pictured. **

There are 25 teeth on the upper most counter shaft gear and 35 teeth on it's opposing gear located on the main shaft. If you divide 25 into 35, you come out with a .7142857 (.714) ratio, which is the 94+ LS transmission's 5th gear ratio.

Now using the same method, you can find the FD ratio by counting the teeth of the final drive gear, and then dividing that by the number of teeth of it's opposing gear located on the counter shaft, which would be 64 / 15 = 4.26666666 (4.266). The 94+ LS transmission's final drive ratio.

Here is a list of B series tranny gear ratios for reference purposes:

The information in this chart is for reference only, and may not be 100% accurate in all cases.

or you can use this:
http://www.bseries.net/html/specs/btrannyspecs.php

Well that's about all there is to it. Hope this is helpful to some of you...




Modified by JV at 8:07 PM 5/3/2004
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Old 04-30-2004, 07:33 PM   #2
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Default Re: How to: Identifying B series transmissions. (JV)

awsome info, dont let anyone screw you when buying a tranny, IE some wierd kind of b16/ LS match up
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Old 04-30-2004, 07:39 PM   #3
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awesome **** bro.. may come in handy i just wrote this down in my little notebook of useful info
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Old 04-30-2004, 07:43 PM   #4
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good info!
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Old 04-30-2004, 07:45 PM   #5
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Default Re: (Fred n J's_1.8's)

COUNTING TEETH!!!


NOOOOO!!!!!!!!!!!!!!!!!!


I hate counting teeth....- having 3 full gear sets splattered out in front of you trying to figure what is what!

good useful info tho
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Old 05-01-2004, 07:04 AM   #6
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Tech in a tech forum?

Weird...
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Old 05-01-2004, 08:21 AM   #7
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Old 05-01-2004, 08:29 AM   #8
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Default Re: How to: Identifying B series transmissions. (XxSOHCDriVerxX)

Great write up but what if i can't count past 10.....LoL
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Old 05-01-2004, 08:59 AM   #9
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Default Re: (B18C5-EH2)

Quote:
Originally Posted by B18C5-EH2
Tech in a tech forum?

Weird...
at least there were some pictures so i didn't have to read it all.
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Old 05-01-2004, 09:04 AM   #10
 
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Default Re: How to: Identifying B series transmissions. (90crxzcgasd)

Quote:
Originally Posted by 90crxzcgasd
Great write up but what if i can't count past 10.....LoL
Take off your shoes. I have the same problem, that's why I wear sandles a lot.

Good write up.

<- Travis: who doesn't wear sandles but says he does for the sake of the joke =P
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Old 05-01-2004, 10:56 AM   #11
 
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awsome write up! will this work for other tranys besides the b series?
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Old 05-01-2004, 11:14 AM   #12
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Default Re: (B18C5-EH2)

Quote:
Originally Posted by B18C5-EH2
Tech in a tech forum?

Weird...
Yea, leave it to JV.

Good writeup doood.

To anyone who is afraid to open your tranny casing, it's easy and takes like 15 minutes.

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Old 05-01-2004, 11:17 AM   #13
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Love seeing threads like this
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Old 05-01-2004, 03:18 PM   #14
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awsome write up! will this work for other tranys besides the b series?
will work with any transmission for any car.

Gear ratios are figured out by how many times the main shaft spins to spin the counter shaft one time.
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Old 05-01-2004, 03:41 PM   #15
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very useful information. gonna have to save this thread.
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Old 05-01-2004, 03:50 PM   #16
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wooot great thread to see after all the mayhem lately
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Old 05-01-2004, 07:28 PM   #17
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Default Re: How to: Identifying B series transmissions. (JV)

good ****
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Old 05-01-2004, 07:34 PM   #18
 
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Default Re: How to: Identifying B series transmissions. (JV)

great write up. very helpful
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Old 05-02-2004, 02:32 PM   #19
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Default Re: How to: Identifying B series transmissions.

Good work JV
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Old 05-02-2004, 02:47 PM   #20
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Default Re: How to: Identifying B series transmissions. (JV)

Simply an awesome write! Question. Can you use this chart to make a hybrid transmission? Say a Y21/S21 tranny with an S80 fifth gear and final drive? Logic: Short gears for acceleration with a tall 5th gear for cherry gas mileage. Oh, and any links to B20 ratios?
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Old 05-02-2004, 05:21 PM   #21
 
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Default Re: How to: Identifying B series transmissions. (Guam_CiviC619)

nice write-up
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Old 05-02-2004, 06:10 PM   #22
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Default Re: How to: Identifying B series transmissions. (JV)

i dunno if this is a correction.. or maybe my tranny is different. but i have a 90-91 integra XSi non-lsd tranny (tranny code J1)

J1
1st 3.25
2nd 2.052
3rd 1.416
4th 1.103
5th 0.906
Final 4.400

i know the 5th gear is correct, i had my friend and my dad count them 5 times.
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Old 05-02-2004, 06:12 PM   #23
 
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Default Re: How to: Identifying B series transmissions. (Downey)

cool ****!
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Old 05-02-2004, 08:24 PM   #24
 
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any info on the usdm LS cable trannys? They are A1 I belive.
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Old 05-03-2004, 04:00 PM   #25
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Default Re: How to: Identifying B series transmissions. (Downey)

Quote:
Originally Posted by Downey
i dunno if this is a correction.. or maybe my tranny is different. but i have a 90-91 integra XSi non-lsd tranny (tranny code J1)

J1
1st 3.25
2nd 2.052
3rd 1.416
4th 1.103
5th 0.906
Final 4.400

i know the 5th gear is correct, i had my friend and my dad count them 5 times.
I added a disclaimer to the gearing chart. Thanks for sharing the info.

This topic is totally open to anyone who wants to add more (hopefully factual) information.
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