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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
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