I have a 92 GSR that had a stock ys1 tranny. The tranny was blown so I bought a new tranny from ASAP motors. They said that the tranny they sent me is an S1. How would I be able to confirm this? I mean it has a yellow sticker on it that says S1 and a barcode but I mean anyone can just put a label on it and say that it is an S1. They say all their parts are JDM. Is there any definite way to confirm that I wasnt sent a Y1 J1? Since my motor is a b17, I want the shorter gears and jsut want to confirm that I wasnt ripped off ya know? Any help is always appreciated. Thanks alot guys

 

 

anybody?

 

from the outside I don't think there is a way to actually confirm

 

I don't know if this works with a non-LSD tranny. With an LSD tranny, you can count the number of turns of the transmission input shaft to one turn of the output (where the axles fit in). If both outputs on a non-LSD tranny turn together when the input shaft is turned, this will work on a non-LSD too.

There are 26 splines in the transmission shaft (24 on the pre 1992 small spline transmissions). Put marks at two points on the splines and one reference point on the case (I used white paint and a fine paint brush). Then put a line on the output running from the case to the shaft. This will allow you to know when the output shaft has turned exact one time. Shift the transmission into a gear, turn the input shaft by hand, and count the number of turns it takes to move the output shaft exactly one turn. You can get 1/26 of a revolution accuracy by counting the number of splines the input shaft has moved in addition to the full revolutions.

Now it takes a little math. The total revs are equal to the gear ratio times the axle ratio. For example, 1st gear in a GSR tranny would be 3.23 1st gear x 4.40 final drive, or 14.212 to 1. 0.212 times 26 equals about 5.5. Thus, with this transmission, you should get 14 revolutions plus 5 1/2 splines for one revolution of the output shaft in first gear.

Do this for each gear. You should be able to figure out what your individual gears and final drive is by comparing to charts for each transmission.

 

Usually S1 trannys are JDM 89-91 B16A transmissions and are short geared, pretty close to the same gearing as a B17 YS1 trany.

Now, I *think*, don't quote me, that there are US S1 GS/LS trannys w/longer gearing.

If this S1 tranny is already on your car, what you can do is the MPH vs. RPM test. For instance, take note of each gear, 1st thru 5th when you hit 4000rpm. Write it down each mph speed your at @ 4000rpm and report back here. Also let us know what your wheel & tire dimensions are. This will help determine if your gearing is short or long, without having to crack the tranny open.

 

thanks, Ill let you know as soon as I try it