Rear Axle Ratios
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Rear Axle Ratios
Can anyone tell me what rear axle ratios were available for the '42 -47 1/2 tons? Mine seems to be a high speed rear axle as 2 revolutions of the drive shaft = 1 wheel revolution. Does this seem right?
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Joined: Aug 2003
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From: Oakdale,Ca.
With an open (non-posi) rear, multiply the pinion rotation x2...seems like you have a 4.11, assuming the pinion rotates "just" a little more than 2 rev's per one tire/wheel rev.
If you have a posi (both wheels turning, and assuming the posi works) then the pinion rotation is direct. This would be for clutch/cone type posi's.
If you have a posi (both wheels turning, and assuming the posi works) then the pinion rotation is direct. This would be for clutch/cone type posi's.
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Thanks
Thanks to Mike and 46 Ford for the replies and info. Looks like I will be on the hunt for a 3.54/1 ratio as I plan on using the truck regularily on the highway. The 239 cu in flattie works fine and has reasonable power just need to get more speed out of the truck without wringing out the engine too much.
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Originally Posted by COE Lloyd
Thanks to Mike and 46 Ford for the replies and info. Looks like I will be on the hunt for a 3.54/1 ratio as I plan on using the truck regularily on the highway. The 239 cu in flattie works fine and has reasonable power just need to get more speed out of the truck without wringing out the engine too much.
Although they gave a total of six speeds from the standard 3 sp. trans.,
they were usually used as an over-drive for hwy. use. Check out the
swap meets and classified ads here.
Tuned
Joined: May 2001
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From: a little S/E of Nome
Out of your power band
That flattie may no have the omph you want for the highway if it is in stock specs. You may want to bump up the compression or put in a Merc crank to get you over the hump. It also depends on what you call highway; 50 - 60 mph or that freeway 70- 80 mph? Some cam and headers would make it breath a bit better too. If freeway driving, an engine change would be an asset.
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Just as a thought, have you ever considered an overdrive transmission? A 4.11 rear end sounds like it would work well for that truck so maybe leave it and swap the transmission out for a s10 t5 or maybe an aod? Im assuming you are running a 47 style flathead so the one kit I know off the top of my head lets you mount a chevy 5 speed to it. here is the link: http://www.transmissionadapters.com/Pricing.htm
Just my 2 cents...........
Just my 2 cents...........
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