2 speed rear end question
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Senior User
Joined: Feb 2007
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From: KC Kansas metro
2 speed rear end question
Is the ratio of a two speed rear end in high range higher than a stock ratio (like an overdrive) or is the low range lower for pulling? I have a stock 56 F-350 which as you know is severely limited on the top end. Would a two speed axle give me more speed. I am talking about a rear end like might have been available in the 55-59 heavy trucks.
Although I am not currently in a position to aquire, here is a likely candidate, hate to see this one junked, I've seen a lot worse resurrected.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&sspagename=STRK%3AMEBTOX%3A IT&viewitem=&item=280188381789&_trksid=p3984.cTODA Y.m238.lVI
Although I am not currently in a position to aquire, here is a likely candidate, hate to see this one junked, I've seen a lot worse resurrected.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&sspagename=STRK%3AMEBTOX%3A IT&viewitem=&item=280188381789&_trksid=p3984.cTODA Y.m238.lVI
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From: Joyce, WA
I can't remember the ratio exactly of my 56 F600 2 speed rearend. I would describe it as a low range and a lower range. 5.?? and 8.?? are the ratios. Someone will be along shortly with exact numbers.
Logistics Pro
Joined: Feb 2005
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From: Upper Left Coast
Reamer is right.
Most of them were 5.83 and 8.11:1
That rear end wouldn't work in a F3/350 though unless you could find hubs that would mate to the wheels you have.
Ring and pinions for that rear end are almost non-existent.
Cheers,
Rick
Most of them were 5.83 and 8.11:1
That rear end wouldn't work in a F3/350 though unless you could find hubs that would mate to the wheels you have.
Ring and pinions for that rear end are almost non-existent.
Cheers,
Rick
Logistics Pro
Joined: Feb 2005
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From: Upper Left Coast
My tires are about 40" diameter.
At that diameter I calculate 504 rear wheel rpm at 60mph which, at 5.83:1 is 2938 rpm.
With the 0.71 OD my E4OD has I would have 2086 rpm at 60.
Even with a 2 speed an OD is nice.
At that diameter I calculate 504 rear wheel rpm at 60mph which, at 5.83:1 is 2938 rpm.
With the 0.71 OD my E4OD has I would have 2086 rpm at 60.
Even with a 2 speed an OD is nice.
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From: KC Kansas metro
Thanks all, (as usual) I had not considered the different bolt pattern and taller tires of the F-600. My other hobby is cross state bicycling, guess the stock F350 gearing would be a little faster than that if I ever decide to go anywhere with it.
I do have a line on a cheap Gear Vendor OD unit, doubt if they make an adaptor for my setup though.
I bought the '56 on a whim after owning an F-100 in my 'ute, I did not realize how badly I really needed it and how much fun it was going to be.
Thanks again.
I do have a line on a cheap Gear Vendor OD unit, doubt if they make an adaptor for my setup though.
I bought the '56 on a whim after owning an F-100 in my 'ute, I did not realize how badly I really needed it and how much fun it was going to be.
Thanks again.
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Originally Posted by Nojive55
I do have a line on a cheap Gear Vendor OD unit, doubt if they make an adaptor for my setup though.
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From: KC Kansas metro
Originally Posted by GVJosh
What tranny is in that '56? If there is no adapter you may be able to do a divorced setup, where you have a short drive shaft between the tranny and GV, then another drive shaft from GV to rear end. I've seen more than a couple like that.
I noticed in my '56 shop manual that a 5 speed OD was available in the heavier trucks, the chance of finding one of those would be pretty remote I suppose, plus I'd get greater reduction with the GV.
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A divorced (GV calls it a remote or RX) is basicaly the same as a married, except it mounts in a cage of sorts and replaces your carrier bearing. It will have and input and out put yoke. I've seen the RX units on everything from a 41 Packard to newer trucks. Give Gear Vendors a call and they can hammer out the details for you.
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