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JDM 5-spd short gears part# confirmation list *help*

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Hi Everyone,

I'm looking to see if anybody can help confirm the part numbers for the jdm 5spd gear set. This is what I have and was wondering
what else I'll need to replace?

Thank you.

-MAIN SHAFT (1ST&2ND) 23210-PR8-020
-4TH GEAR MAIN SHAFT 23451-PR8-010
-5TH GEAR MAIN SHAFT 23581-PR8-020
-1ST GEAR COUNTER SHAFT 23421-PR8-020
-4TH GEAR COUNTER SHAFT 23481-PR8-000
-5TH GEAR COUNTER SHAFT 23461-PR8-000
-3RD GEAR MAINSHAFT 23441-PR8-A02
-3RD GEAR COUNTER SHAFT 23471-PR8-A00
-2ND GEAR COUNTER SHAFT 23431-PR8-A01
-5TH GEAR COUNTER SHAFT 23461-PR8-000
 
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Hi Everyone,

I'm looking to see if anybody can help confirm the part numbers for the jdm 5spd gear set. This is what I have and was wondering
what else I'll need to replace?

Thank you.

-MAIN SHAFT (1ST&2ND) 23210-PR8-020
-4TH GEAR MAIN SHAFT 23451-PR8-010
-5TH GEAR MAIN SHAFT 23581-PR8-020
-1ST GEAR COUNTER SHAFT 23421-PR8-020
-4TH GEAR COUNTER SHAFT 23481-PR8-000
-5TH GEAR COUNTER SHAFT 23461-PR8-000
-3RD GEAR MAINSHAFT 23441-PR8-A02
-3RD GEAR COUNTER SHAFT 23471-PR8-A00
-2ND GEAR COUNTER SHAFT 23431-PR8-A01
-5TH GEAR COUNTER SHAFT 23461-PR8-000

First off, if you're planning on buying all this gearset yourself piece-by-piece you will have a hell of a time, there are several gears that have been backordered for a long time. You're better off finding a vendor with the full gearset to sell you if you don't want to wait months or more.

When you ask what else you'll need to replace, are you rebuilding the transmission yourself or having a professional do it? Are you planning to replace bearings, synchros, and other worn items as well? There are standard wear items plus items that you might need to replace like hubs/sliders and other gears if those are damaged.

You can use https://honda.epc-data.com/nsx/e-na1/14741/ as a parts reference. It points to a first-gen JDM NA1 NSX so all transmission parts will be of the JDM gearset. If you want the NSX-R final drive the same website has an NSX-R parts list.

You can reference SoS as well https://www.scienceofspeed.com/inde...ons-gears-lsd/honda-5-spd-short-gear-kit.html.

The JDM gearset only changes gears 2-4 and the mainshaft. Parts ending in -A00, -A01, etc. are Acura/USDM specific, maybe EU as well.

-MAIN SHAFT (1ST&2ND) 23210-PR8-020 - yes, https://honda.epc-data.com/nsx/e-na1/14746/transmission_mt/26446/?p=1&fromMap=1

-4TH GEAR MAIN SHAFT 23451-PR8-010 - yes, https://honda.epc-data.com/nsx/e-na1/14741/transmission_mt/26446/?p=3&fromMap=1

-5TH GEAR MAIN SHAFT 23581-PR8-020 - no, this part is the same between all 5-speeds

-1ST GEAR COUNTER SHAFT 23421-PR8-020 - no, this part is the same between all 5-speeds

-4TH GEAR COUNTER SHAFT 23481-PR8-000 - yes, https://honda.epc-data.com/nsx/e-na1/14741/transmission_mt/26448/?p=6&fromMap=1

-5TH GEAR COUNTER SHAFT 23461-PR8-000 - no, this part is the same between all 5-speeds

-3RD GEAR MAINSHAFT 23441-PR8-A02 - no, -A02 is the US part number. You need 23441-PR8-020, https://www.amayama.com/en/part/honda/23441pr8020

-3RD GEAR COUNTER SHAFT 23471-PR8-A00 - no, -A00 is the US part number. You need 23471-PR8-000, https://www.amayama.com/en/part/honda/23471pr8000

-2ND GEAR COUNTER SHAFT 23431-PR8-A01 - no, -A01 is the US part number. You need 23431-PR8-010, https://www.amayama.com/en/part/honda/23431pr8010

-5TH GEAR COUNTER SHAFT 23461-PR8-000 - you listed this twice, no
 
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The gear that makes the big difference is second gear. That is why 1995 and 1996 Nsx’s had the previous usdm gears but Honda changed second gear to the jdm ratio to offset the extra weight of the targa.
 
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The gear that makes the big difference is second gear. That is why 1995 and 1996 Nsx’s had the previous usdm gears but Honda changed second gear to the jdm ratio to offset the extra weight of the targa.

Yes, but the 95-96 Targa 2nd gear is actually in between the US and JDM. The JDM 5-speed 1-2-3 is nearly identical to the 6-speed 1-2-3.

2nd Gear Ratios
  • 91-94 US: 1.727
  • 95-96 US: 1.8
  • 91-96 JDM: 1.952
 
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Yes, but the 95-96 Targa 2nd gear is actually in between the US and JDM. The JDM 5-speed 1-2-3 is nearly identical to the 6-speed 1-2-3.

2nd Gear Ratios
  • 91-94 US: 1.727
  • 95-96 US: 1.8
  • 91-96 JDM: 1.952

Honcho thanks for that clarification. I will add that the difference is very noticeable on a 1995. (Mrs SoCalx has a 1995). And it is very noticeable compared to my 1993. And I previously had a 1997 and 2005, so I have tried them all. Lol
 
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Hey guys,

is there anyway of telling what these are? jdm or usdm?

Parts list is:
- Main shaft
-Main shaft bearing
-2nd counter gear
-3rd counter gear
-3rd main gear
-5th counter gear

Thank you
 
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Teeth on counter shaft gear / teeth on input shaft gear = gear ratio.

Count up the teeth, calculate the ratios, and compare to specs to see what gear set you have.
 
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