Transmission identification. Quick response needed!

ASSISTANCE Stock Engine-Bay Components
1

I’m at a seller’s place this very moment, and I need to figure this out before I buy this car. I have done lots of searching and I understand the basics on how to do this, however something isn’t adding up.

I have the list of gear ratios, and I know that you have to count the revolutions of the input shaft versus the output shaft, but this car is complete minus the motor, and the transmission is attached to the axles. So I am counting the revolution of the input shaft compared to the revolution of the tires. The numbers I am getting are exactly half of what they should be for a GSR transmission, but I don’t understand why this is happening.

Example, in first gear, the input shaft turns about 7.3 (I’m eyeballing) times to the tire spinning once.

GSR ratio is 3.307 times final drive of 4.4 equals 14.55 revolutions. Double what I am seeing.

An LS transmission would give me 13.78 revolutions.

All 5 gears are giving me exactly half the number I’m expecting to see for a GSR. What am I missing?!

2

As I’m sitting here waiting for a response to my post, I’ve been calling random Honda shops. The consensus is that it should be a 1:1 ratio between the output shaft and the tires themselves. This just isn’t making any sense whatsoever.

3

Well, I pulled the trigger and got it. I’m hoping I still got a good deal. $400 for a 92,000 mile DB2 with a clean title, clean original seats and original rims, a rough body, and hopefully a true GSR tranny with the same number of miles. No ECU and no motor.

But I would still like an answer to the original question if somebody can get to that at some point.

4

Were you turning it over at the cam gears instead of the crank?

5

Input shaft. There is no motor.

6

Update

Well almost 7 months later…

I had this transmission installed in a DA. Works fine, and is definitely a GS-R tranny. I never did figure out the reason for the discrepancies from the original post. I guess that will remain a mystery!