Im getting a 99 Si tranny in my GSR and i thought everything would bolt up fine, but the guy selling to me said i need a different shift linkage. I thought all B series hydro trannies use the same linkage, whats the deal on this??

 

same trans,same linkage,bolts on no prob.different ratio

 

OK, cool thats what i thought. It has shorter gears than a GSR from what ive read.

 

yup, you're right it does have shorter gears. the Si trannys has the same gear ratio as the ITR trannys. the only differances is no LSD.
note: 98 spec type R has shorter final drive than any other honda trannys

 

Thats good news, should be sweet with my Quaife LSD hehehe

 

They don't have the same ratios as the ITR trans, the S4C has a 4.26 FD not a 4.40 like the ITR.

 

I really dislike that 4.26 FD. Do you know if the Y21 Fd is 4.40 or 4.26?

 

Y21 = 4.40FD

 

The 99-00 Si tranny has 4.4 FD, some website i read said it has 4.266 FD, but its wrong, i think it was some B16 site.

 

You can believe whatever you want, it doesn't matter to me. The fact is it's a 4.266 FD and if you don't believe me count the teeth yourself.

 

we had a couple of these transmissions apart-here is what we have.
99-00 si
1st-3.230
2nd-2.105
3rd-1.458
4th-1.107
5th-0.875
fd-4.266 (same as ls)

the only difference in this and the itr is 5th @ 0.848 and the final drive @ 4.40 w/lsd.hope this helps

 

What the ****? Ive heard so many answers to this question, i dont know who to believe, but answer this: If the Si tranny has a 4.266 FD, why are the gears still shorter than a GSR? I used to have an Si, and on the highway, its about 400 RPMS higher than the GSR tranny with the same wheel/tire combo.

 

Just a note... but the transmission and engine have no idea what sort of wheels are bolted on the car. They only affect your ACTUAL speed (aka, read with radar). Your rpms at a given speed will be the same with 15" wheels as they would were your car on jackstands accelerating with no wheels at all.

Dustin

 

Ahhh, unless the speed is from a GPS hehe

 

hehe yeah a GPS will do it.

 

every major auto magazine has specs ot the Si with the FD 4.40. I want to know why some of you here belive its 4.26. give us reason. give us proof!

 

i have 2 of these transmissions here and a-part,the final drive is 4.266.rear your honda service manula also,in the front of the book under design specs the b16a2 is listed with a 4.266 ratio.remember:don't alsways belive what you read !!

 

OK, is it the S4C tranny?

 

Okay, I've had this same question before.

A few things to consider here:

TIRE/WHEEL SIZE WILL NOT AFFECT RPM/MPH TESTING BETWEEN TWO VEHICLES!

You're trying to match the RPMs and MPH, right? Tires will only alter the ACTUAL speed of the vehicle - it will NOT change the outcome of RPms vs. MPH on the speedo. Get it? If I've got 15'' wheels and I'm trying to see if my USDM ITR has the same gearing as someone with an Si with 17'' whhels/tires, we can still conduct the test and still be accurate.

How?

Let's say my speedo says 30mph, and I'm really doing 30mph, and my tach says 4000rpms in second gear.

Now let's say the other car's speedo says 30mph and he's really doing 35mph, if his tach reads 4000rpms, then the final drives are the same because the 2nd gears are the same too. Just because the vehicle could really be doing 35mph won't change the correlation between the speedo head and the tach needle.

Get it? for real, though, i did this test with my car (B18C5 in a 1992 hatch) and my fiancee's car (B16A2 in a 1992 hatch). The cars have the SAME wheels and tires(not that it matters though) and have the same tachs (stock). I ran both cars in 2nd gear and held it at a constant 30mph. The result? BOTH cars sat at 4000rpms.

Same final drive - 4.400.

Teeth count? Best way I'm sure, but how could my test be wrong? Same car, tach, etc. and same results.

I think the trannies came with BOTH fianl drives - 4.400 and 4.266.