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Old 07-30-2012, 04:26 PM   #1 (permalink)
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How to spot a Civic CX transmission?

Ok maybe this isn't the right section, so I put How To in the title just to make it fit in. I want to find a 4th gen / cable 5 speed out of a CX, as I believe that is the same final drive as an CRX HF transmission, isn't it? So if I find one sitting in someones garage, is there a code stamped on the case somewhere that will tell me if it is from a CX? I had some shady sounding guy tell me he had one, but I have a hunch that if I had said I wanted an Si trans he would have said the same thing!

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Old 07-30-2012, 08:10 PM   #2 (permalink)
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I was about to ask if you were from Cincinnati. I know of a guy JUST like that. I think there are ways to tell if it is from and SI, but not from a DX.
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Old 07-30-2012, 08:25 PM   #3 (permalink)
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Well my sixth gen DX has a number stamped on the transmission that begins with a code specifically identifying it as a 5 speed manual (S40), but I don't know if the serial number following that code designates a DX. I expect it might. And I would guess that from the time the Civics were made to have interchangable parts they designated different numbers simply for inventory clarity. But beyond those educated guesses, I'm sorryy, I don't know. Try honda-tech.com?
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Old 07-30-2012, 08:29 PM   #4 (permalink)
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I thought all of the CX's were hydraulic. 92 and up?
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Old 07-30-2012, 08:39 PM   #5 (permalink)
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Honda Transmission specs - HondaSwap Forums
This might help if it is not information overload.
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Old 07-30-2012, 09:34 PM   #6 (permalink)
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Quote:
Originally Posted by Old Mechanic View Post
Honda Transmission specs - HondaSwap Forums
This might help if it is not information overload.
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The final drive for the HF does not look right. I have seen 3.150, I think, or something like that, taller than the VX, elsewhere. Even if I'm incoreect about the exact HF ratio, the site's own data suggests the HF had shorter gearing than the VX/CX and the HX. That can't be, can it?

[EDIT: here's a guy online with information similar to what I just described: http://www.gassavers.org/showpost.ph...5&postcount=12]
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Last edited by California98Civic; 07-30-2012 at 09:39 PM..
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Old 07-30-2012, 09:58 PM   #7 (permalink)
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Looks like 5th gear is .694 OD and the Diff is 2.954.
That would be like a direct 4th gear and a 2 to 1 differential.
My F150 was .79 and 2.73, but the HF is lower than that.

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Old 07-30-2012, 10:16 PM   #8 (permalink)
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Looks like the VX was a 3.25. Not sure of the 5th gear ratio. I know mine would tach 1k at 30 MPH in 5th gear. So that means 3 k would be 90. Theoretically 3rd gear would redline at 120 MPH.

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Old 07-31-2012, 02:12 AM   #9 (permalink)
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your best bet is to get an old clutch. mark it. Place the mark at 12 o' clock

push the shift rod into the trans, putting it in 4th gear (0.853)
mark the differential.

the final drive is 3.25, 4th gear is 0.853

3.25 * 0.853 = 2.77225

it should take 2.77225 full revolutions of the clutch to make one full revolution of the differential.

so it should turn 2.77 times and end up pointing a little after 9'o clock to make one full revolution.

and of course make sure that the stamp near the oil fill plug says a000 instead of b000.

serial numbers mean nothing.
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Old 07-31-2012, 03:25 AM   #10 (permalink)
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Ya I noticed that a lot of the charts I found showed CX starting in 1992, but they were also American based. We for sure had 1988-1991 Civic CXs up here. I was looking at one yesterday, but it was too nice to chop up to get the transmission out of. I need all the parts for a manual trans swap for my new project anyway, so my best bet is probably to find a rotted out parts car that says CX on the hatch and roll the dice that it has the original transmission. Then I can get the pedals, flywheel, axles etc out of it too.

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