Gear Ratios For 3rd Gen Civics/1st Gen CRX's

[Davidov Speed WRC]

Hopefully some of you 3rd Gen Enthusiasts can answer my questions about 3rd Gen Trannys.(84-87 Civic's and CRX's)
1.What are the ratios for the Dx(Civic Sedan), CRX's, and the 84-87 Civic Si

2.I want more top end pull(i.e. 5th gear), I want to know which 5th gear would pull more if I were to replace it from another 3rd Gen...

I read about one guy that switched the 5th gear in his Civic Wagonvan for a 85 CRX HF 5th gear, so I thought the Si gear would be better than my 86 Civic Dx Sedan's? Anyone got specs?

[Gasoline Fumes]

This is from my 1985 Civic service manual (which doesn't cover the Si). The only other 5th gear I know of is the 0.655 from the HF, which is what I put in my Wagon. You could change the final drive, and get more pull in every gear. Or just drive in 4th gear.

1985 Civic Sedan:
1st = 2.916
2nd = 1.764
3rd = 1.181
4th = 0.846
5th = 0.714
R = 2.916
Final = 4.266

From other sources around the internet (I can't guarantee these are correct):
1985 CRX Si = 4.428 final drive, other gears are the same.
1986 CRX Si = 4.400 final drive, other gears are the same.

an interesting tidbit: the 4:93 FD from the 1980 Civic 1300 5-speed is a
compatible final drive for the 85-87 Si (and other) transmissions. this
was the low-buck way to get a short trans in the old-school days.
unfortunately, 1980 civic 1300 5-speeds aren't too common in the junkyards,
making this a tough piece to find.

[Davidov Speed WRC]

Ok, thanks alot, however I am not too knowledgeable with transmissions.
Is the Final Drive just sum of the rest of the ratios? or is it a seperate gear??
Since the 86 CRX has a lower FD ratio, does that mean all the gear have lower ratios?
I would happy to get some answers to my newbie transmission questions

[Gasoline Fumes]

In a FWD transmission there's two shafts. The mainshaft has the clutch plate and six gears on it (counting reverse). The countershaft has the other half of the gears on it, and also drives the differential. The final drive is the gear ratio between the countershaft and the differential. So to get the overall ratio in a gear, you multiply the final drive by the gear ratio. And yes, changing the final drive has the same effect on every gear.

Written for RWD transmissions, but still informative:
http://www.howstuffworks.com/transmission.htm