9 inch gear ratios

Ford 9 Inch Gear Ratios

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Slick 60's Club Inline 6 Banger's Building Up A 6 Cylinder Engine

Ratio	Teeth	Ratio	Teeth

2.80	42-15	4.22	38-9
2.86	40-14	4.33	39-9
2.91	32-11	4.44	40-9
2.94	47-16	4.50	36-8
3	39-13	4.56	41-9
3.07	43-14	4.63	37-8
3.25	39-12	4.71	33-7
3.33	40-12	4.86	34-7
3.40	34-10	5	35-7
3.45	38-11	5.14	36-7
3.50	35-10	5.29	37-7
3.55	39-11	5.43	38-7
3.60	36-10	5.50	33-6
3.70	37-10	5.67	34-6
3.75	45-12	5.83	35-6
3.82	42-11	6	36-6
3.89	35-9	6.20	31-5
4	36-9	6.33	38-6
4.11	37-9	6.50	39-6

Here are two nine inch ring gears side by side, one from a 3.00 ratio (thinner gear), the other from a 3.50 ratio (thicker).An easy way to spot a nice ratio after a while is by visual id.-the thicker the gear the better the performance ratio, thinner the gear= less performance, more fuel economy and better highway performance.

Can you spot the difference in the above two pinion gears? Both are 10 tooth gears taken from 3.50 gear ratios, but one has been used behind a Daytona pinion support with the larger inner bearing (see above sections for discussion on Daytona pinion support identification).Note the larger bearing on support to the left.

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Slick 60's Club Inline 6 Banger's Building Up A 6 Cylinder Engine