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Discussion Starter · #1 ·
D-Series Gear Ratio information

88-91 CRX Si

1st 3.250
2nd 1.894
3rd 1.259
4th 0.937
5th 0.771
Final Drive 4.250

88-91 CRX DX

1st 3.250
2nd 1.894
3rd 1.259
4th 0.937
5th 0.771
Final Drive 3.888 (88 DX: 3.722)

88-91 CRX HF

1st 3.250
2nd 1.650
3rd 1.033
4th 0.823
5th 0.694
Final Drive 2.954 (3.250 in California)

88-91 CRX ZC DOHC (JDM)

1st 3.250
2nd 1.944
3rd 1.346
4th 1.033
5th 0.878
Final Drive 3.888

90-93 Integra ZC SOHC (JDM)

1st 3.250
2nd 1.894
3rd 1.259
4th 0.937
5th 0.771
Final Drive 4.250

90-93 Integra ZXi ZC SOHC (JDM)

1st 3.250
2nd 1.894
3rd 1.259
4th 0.937
5th 0.771
Final Drive 4.437

Identifying a transmission by visual inspection

All CRX transmissions will be labeled as being an L3 transmission. The number of rings (grooves) on the input shaft tell you which year that it is from. 0 rings = '88, 1 ring = '89, 2 rings = '90-'91

To identify which type of gear set it has, you can use the stampings on the outside of tranny case, just above the fill hole. There is a round stamp with some numbers/letters. All these do is specify bearing sizes. The Si usually had larger bearings and this is reflected by a code of PL3/3000 and sometimes 9000. If it says PL3/A100, the tranny has smaller bearings and is probably a DX, or HF model. I say "usually" and "probably" because Honda did produce some small bearing Si transmissions. If the round stamp is blank, it's an '88 transmission and you cannot determine the gearset by this method.

DOHC ZC transmissions use a larger differential with thicker axles. You can identify them by the larger hole where the axles plug into the differential.

Identifying a transmission by mathematical calculation

By placing the transmission in 5th gear and turning the input shaft 10 times and measuring how many times the differential rotates, you can theoretically figure out which transmission you have from the following equation:

10 / (5th gear ratio) / (Final drive ratio) = (# of turns of the differential)

Examples:

CRX HF
10 / .694 / 3.250 = 4.43 turns of the differential

CRX DX
10 / .771 / 3.888 = 3.34 turns of the differential

CRX Si
10 / .771 / 4.25 = 3.05 turns of the differential

DOHC ZC
10 / .878 / 3.888 = 2.93 turns of the differential

SOHC ZC (same gearing as CRX Si)
10 / .771 / 4.25 = 3.05 turns of the differential

SOHC ZC ZXi
10 / .771 / 4.437 = 2.92 turns of the differential

Obviously this method doesn't help you differentiate the normal DOHC ZC transmission from the SOHC ZC ZXi transmission, so you will also need to do a test in 1st gear.

10 / (1st gear ratio) / (Final drive ratio) = (# of turns of the differential)

Examples:

DOHC ZC
10 / 3.250 / 3.888 = 0.79 turns of the differential

SOHC ZC ZXi
10 / 3.250 / 4.437 = 0.69 turns of the differential

D-Series Clutch information

88 CRX (all) 190 mm clutch/21 splines
89 CRX (all) 200 mm clutch/20 splines
90-91 CRX (all) 212mm clutch/20 splines
 

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Super great write up I can never remember this info... It is nice to have it here as a sticky. . .

Good Job Stickershop/ /
 

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Discussion Starter · #3 ·
No problem. If anyone thinks of any more information that should be posted up here. Let me know and I'll add it.
 

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Quick note/clarification: the '88 DX final drive is different from the '89-'91 DXs; it's a 3.722 final. Possibly the '88 ZC has the same difference...

Mike
 

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Discussion Starter · #5 ·
Kwicko said:
Quick note/clarification: the '88 DX final drive is different from the '89-'91 DXs; it's a 3.722 final. Possibly the '88 ZC has the same difference...

Mike
I imagine that the ZC would follow suit since the spline count differences apply to the 88 ZC as well. Do you know of any websites that verify the 3.722 final drive for 88 DX's? I found one...i just want to verify. http://www.geocities.com/chipman_13/clippings.html
 

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No websites - just my trusty old '88 Factory Service Manual.
 

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Discussion Starter · #9 ·
bluecrxnc said:
88-91 CRX HF

1st 3.250
2nd 1.650
3rd 1.033
4th 0.823
5th 0.694
Final Drive 3.250
Final Drive is 2.95 for 5 Speed 48 State
Does someone have a scan of the HF stats from the Factory Service Manual to back this up? If so, I'll make the change to the info.
 

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stickershop said:
Does someone have a scan of the HF stats from the Factory Service Manual to back this up? If so, I'll make the change to the info.
I don't have the FSM to show you for this. If I did I'd post it in a heartbeat.

I own a 89 CRX HF that was virgin until I opened it and swapped in better gearing. The 3.25 Final you show for the HF is the CALIFORNIA version of the HF

TEETH COUNT
88-91 CRX HF:
1st: 3.250 = xx Counter / xx Main
2nd: 1.650 = xx Counter / xx Main
3rd: 1.033 = xx Counter / xx Main
4th: 0.823 = xx Counter / xx Main
5th: 0.694 = 25 Counter / 36 Main
Final: 2.954 (48 States) = 65 Diff Ring / 22 Counter

OTHERS (Owned these transmissions as well)
88-91 CRX DX:
Final: 3.88 = 70 Diff Ring / 18 Counter

88-91 CRX Si:
5th: 0.771 = 27 Counter / 35 Main
Final: 4.25 = 68 Diff Ring / 16 Counter

ZC - JDM DOHC Si:
Final: 3.88 = 70 Diff Ring / 18 Counter

Integra ZXi Final is 4.4375 (I have this final drive in my car as we speak)

The Manual has not been perfect in the past. There are typos here and there in most printed works in history. Someone knows this. Back me up.

Others who show the HF (48 State) as 2.95
http://www.effinmotorworks.com/Effin_site_Files/parts.htm
http://www.knology.net/~jediklc/gearratiosdseries.htm
 

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I did not know the 88 clutch disk was smaller than the 89... very interesting
 

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rex2nr said:
I did not know the 88 clutch disk was smaller than the 89... very interesting
Yep, I went through all that about a month ago or so. Upgraded the disk from 190m to 212mm.
 

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I knew the 89's were 200, and the 90-00's were 212, I upgraded too. But that could explain the issues with my friend's car
 

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I just picked up a ZXi LSD tranny. I WAS under the assumption that it had a 4.43 FD but had the ZC gearset. Soooo I will be installing the ZC 3 & 4th gearset that I have. I had heard that it COULD have a ZC gearset, andybody ever hear of that?

I guess I can just count the turns in third and fourth.

Stickershop, you have the ZXi diff, how is it? Which gearset do you have?
 

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ZXi Ratios:

1st 3.250
2nd 1.894
3rd 1.259
4th .937
5th .771

So the ZXi had Si ratios with the 4.437 FD. My plan is to use the ZC 3rd and 4th gear. I'm wondering if the trans case will need to be clearanced like the Si trans.
Using the ZC 3rd and 4th will yeild an awesome setup and I'd like to get an HF fifth(if anybody has one please PM me)

I calculated what the ratios would do in 10 turns with the ZXi/ZC hybrid compared to the Si and the ZC:

ZXi trans / ZC trans / Si trans / ZXi/ZC hybrid / Type R(for reference)

1st .69 / .79 / .72 / .69 / .70
2nd 1.19 / 1.32 / 1.24 / 1.16 / 1.08
3rd 1.79 / 1.91 / 1.87 / 1.67 / 1.56
4th 2.41 / 2.49 / 2.51 / 2.18 / 2.05
5th 2.92 / 2.93 / 2.93 / 3.25 / 2.68

As you can see, the hybrid trans is about the best D-series trans you can assembkle with stock parts. I plan on using 205/60/13 tires as well, which should give me as close to Type R gearing as I can get.

using the HF fifth should be perfect for the highway to get me to events without spinning 4500rpm the whole way.
 

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Thanks MistaBone for the clarification.

But my 89 HF was 2.95... sure it's not 88/89 vs 90/91? Could be I got an odd ball. Did have '89 Mainshaft, one previous owner before me.
 

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Looks like Honda might have changed it mid year and not told anyone.

I've had a 88 2.95 and 89 3.25 HF.........
 
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