I have a JDM Y21 transmission with a Quaife LSD and I want to know if the JDM ITR(4.785) Final drive will fit my transmission?


Mike

 

up

 

Ok here's the thing.
You can get a 4.7FD to fit in your Y21, problem is you need to use a GSR/Si Coupe/ITR/or CTR FD ring gear which is actually bigger in diameter. So that means, you'd lose out on reusing your queeef LSD. Y21 & S21 tranny's both have a smaller diameter sized FD ring gear. I know, Honda sucks like that with their unorthodox ways.


[Modified by Katman, 11:46 AM 11/1/2002]

 

That sucks
If I sell my tranny what should I get?

 

well if you want a tranny that will accept a 4.7fd, you'll either want once of these hydro b-series trannys:
ITR/CTR
Si coupe (S4C)
94+ GSR
94+ LS

of course the Si coupe and ITR/CTR trannies have the same gearing. You're best off with an ITR/CTR trans out of all those choices though.

 

Besides the lsd what is the difference Between the 99-00 si and the ITR/CTR?


[Modified by rolow, 3:02 PM 11/4/2002]

 

I wasnt aware the S4C had the same size ring gear as a 94+ GSR. I always thought it was the bolt pattern that was different, which is why you couldnt use a ITR LSD in a Y21 with the Y21 ring gear. The 99-00 Si has the same diff part number as the Y21, which is different than the S80 (GSR)

 

I am more confused than ever


[Modified by rolow, 4:23 PM 11/4/2002]

 

the s4c has the LS bolt pattern and offset as the LS .. it is not compatible with GSR and Type R ring gears.

Greg

 

So the s4c is 99-00 Si?

Will the jdm 4.785 fit the 99-00 si?

 

yes, with 94+ GSR and ITR/CTR differential.

Greg

 

Y21 tranny what does that go to?

Quaife makes a final drive that fits the diff you are using. Why don't you give quaife a call?

 

Y21 is the Del Sol VTEC tranny.

The JDM FD will fit in a Y21/S4C if you install the GSR/ITR diff (from who ever you like).

Also, use ITR bearings if you use the ITR/GSR diff.

 

One more time to the top!

So I can install the 4.785 final drive in my Y21 with an ITR diff and bearings?
Is that all I need?

 

depending on differential bearing clearance, you may need c-clip shims from the dealer. On 95% of the trannies that I do I am able to flip the clip to the lower casing and it gets within tolerance. Maybe you'll get lucky, but be sure pop out the seals and check with feeler guage.

Other than that, you just need the JDM final drive kit which includes 1st gear main, countershaft, needle bearings and holder, etc.

greg