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11 and 42 tooth combination is what factory used. 3.82: 1 ratio. There where after market companies that supplied other ratio's.
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I thought that I recall reading here that the early '28 had the 3.82 and the late a 4.10.
Gene Schneider
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You are correct except the 4.10 should read 4.18.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Ray, What is the tooth count that gives a 4:18 ratio?
Life's a long winding trail, love Jesus and ride a good horse!
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chevy b is right on. For future reference I have a copy of the shirt pocket parts book on the 1928. This parts book lists ONLY 1928 parts. It is 3 1/4 X 6. I also have them for the 1925, 1927, and 1929.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Is it not cool the ratios you get when you have an 11 tooth pinion gear and a 37 39 41, 42 or 43 ring gear?
Well, except when you have a 55, 44 or 33 tooth ring gear. I read once how the engineers decided on the tooth counts, then watched with glee how their machinest set up to cut the gears.
Life's a long winding trail, love Jesus and ride a good horse!
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Shade Tree Mechanic
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11 and 42 tooth combination is what factory used. 3.82: 1 ratio. There where after market companies that supplied other ratio's. Warming up an old one. Are these aftermarket ratios available today? And if are, Which ratios?
# 45414
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The most common ratio ring & pinion gear set fitted to cars in Australia was the 42:11(3.82:1),but occasionally,some were fitted with the 46:11(4.18:1)ratio,especially the heavier sedans and coaches.Some of the slower ratios even found their way into open cars as well,eg. tourers and roadsters. This was probably done as the faster ratio became obsolete,and the slower gear set was the only way to keep the car on the road. Be thankful you don't own a 4 cyl truck,as there were 2 ratios available,the standard 38:7(5.42:1),or the stump pulling ratio of 38:6(6.33:1).This ratio was known here in Australia as an "agricultural ratio". The lack of a suitable ratio to make my truck useable for long distance touring is what made me go for a 50:12(4.166:1) ratio from a 1924 Dodge tourer.After a bit of engineering,it all fitted up well,and now gives me an open road cruising speed of between 50-55mph,and better fuel economy too. 
CJP'S 29
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Shade Tree Mechanic
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Shade Tree Mechanic
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I'll have the remains on -28 truck in two weeks.  Actually I'm looking for something like 3,2:1 ratio.
# 45414
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Rizhto, You'll be extremely lucky if you do find a ring and pinion gear set to give you a ratio of around 3.2:1 for a 1 ton truck. And if you do,then you'll need an engine that's in excellent condition,as a standard engine will probably have trouble overcoming the ratio in final drive. That sort of ratio(if it exists)might be O.K. on flat ground, where you have easy running,but if you strike any hills,you may find you won't have the power to pull up the hills,unless you use 1st gear(assuming you have a 4 speed gearbox),and even then it might be a struggle.
CJP'S 29
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Shade Tree Mechanic
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No no, Not for a truck, but for passenger car. And the engine will not be stock.
# 45414
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