Tranny Ratios (mostly Chevy)

http://www.oldengine.org/unfaq/leadfoot/trans.htm

An image of the site:

Automatic Transmission Gear Ratios

	1st	2nd	3rd	4th	Reverse
GM
Powerglide	1.76	1.00			1.76
TH350	2.52	1.52	1.00		1.93
TH400	2.48	1.48	1.00		2.00
200r4	2.74	1.57	1.00	0.67	2.07
700r4	3.06	1.62	1.00	0.70	2.29
4L60E	3.06	1.62	1.00	0.70	2.29
4L80E	2.48	1.48	1.00	0.75	2.08
Chrysler
727	2.45	1.45	1.00
904	2.70	1.54	1.00
518	2.45	1.45	1.00	0.69
500	2.74	1.54	1.00	0.69
Ford
C-4 & C-6	2.46	1.46	1.00

Horsepower requirements for some transmissions

TH350 -- 35hp
    
700r4 -- 70hp
    
  727 -- 40hp
    
  904 -- 35hp
    
 E4OD -- 65hp