I was wondering if there was any difference between the USDM ITR transmission and JDM ITR transmission? I bought mynew ITR tranny last week and installed it, and the guy I bought it from said that since its the JDM version, it comes with a different final drive gear, is this true? Im just wondering, plus I have never driven a type R before, so I wouldnt be able to tell any difference.... also, is there any special type of tranny fluid I should use since I now have LSD?

 

JDM ITR transmissions have a MUCH higher final drive than USDM.

It does also have lower ratio 4th and 5th so that you aren't at 6K RPMs on the freeway.

 

ok, that explains everything, thanks!

 

Doesn't the JDM one have LSD?

 

Im pretty sure they both have LSD, I know this JDM one does...

 

they both do.

 

LSD is AVAILABLE on the SiR-G, not standard.

 

Do you mean a shorter 4tha dn 5th cause the JDM are short than the USDM which means that on the freeway your RPM's are going to be higher than that of a USDM


JDM tranny................USDM tranny
S80............................Y21 Y80 S80 S4C
3.23............................3.23.............. ........1st
2.105..........................2.105.............. ......2nd
1.458..........................1.458.............. ......3rd
1.034..........................1.107.............. ......4th
0.787..........................0.848.............. ......5h
3.................................3............... ............Reverse
4.785..........................4.4................ ........Final

 

Higher = shorter gears

Lower = taller gears

And, btw, that information is wrong, only the USDM S80 LSD (Type R trans) has those gear ratios. The Y80 and nonLSD S80 both have 4th and 5th ratios matching the JDM Spec R transmission.

 

Nope those numbers are right, I referenced them against a program I have that can calculte true speeds based on tire size, and gear ratios, and against http://www.bseries.net/html/specs/btrannyspecs.php

Also this site has the same gear ratios

http://www.allmotorhonda.com/techpag...anny_specs.htm


The ratios are the same as I posted up.