Need help with rear end.
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Joined: Nov 2012
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Need help with rear end.
Hi guys i'm new to the forum. I am currently rebuilding a 1962 f100 Custom. I have decided on a 351w and a 4 speed transmission. I was wondering if anyone could help me decide on what kind of rearend to place under it> i want a positrac for sure. Not sure how to figure out which rearend i could put in for the best resuts and could handle being driven semi hard at times. (not racing hard, just getting on it every now and again)
Thanks, Panther_775
Thanks, Panther_775
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Detroit lockers designed for straight ahead performance, like drag racing. Not a good idea to install one in a daily driver, may self destruct when punching the gas pedal when rounding a corner.
This happened to a pal of mine twice in a 1963 Galaxie, he didn't learn from the first experience. Total parts/labor cost to replace two 9" rear ends was over a grand...and this was in 1963!
This happened to a pal of mine twice in a 1963 Galaxie, he didn't learn from the first experience. Total parts/labor cost to replace two 9" rear ends was over a grand...and this was in 1963!
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New User
Joined: Nov 2012
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Ah thanks for the info. I'm sorry i'm not real knowledgable when it comes to the details of it all. What would be good gear ratio for the rear? also would it be better to have it rebuilt by a professional or is it something i could do with the proper manual?
Post Fiend
Joined: Nov 2000
Posts: 6,060
Likes: 7
From: Glendale Arizona
Detroit's are not spools. They ratchet around corners ( noisy) and have come a long way since 63 in material and construction. Auburn gear and others are similar as the inner shorter radius axle is disconnected on turns.
Leave setting up a rear to a professional. I have been building trucks for 34 years and still take carriers to the pros for setup.
As to ratio it all depends on what the target driving methods you will use. If you are looking for mileage the 351 will pull a 3.00, just do not expect it to gallop off the line. A good all around ratio for the Windsor is a 3.25. All four speed non overdrive transmissions end up at a 1 to 1 final drive ratio.
On the drivers door post the letter or numeral under the axle on the warranty plate. This will tell us what the truck left the factory with and give a starting point.
Garbz
Leave setting up a rear to a professional. I have been building trucks for 34 years and still take carriers to the pros for setup.
As to ratio it all depends on what the target driving methods you will use. If you are looking for mileage the 351 will pull a 3.00, just do not expect it to gallop off the line. A good all around ratio for the Windsor is a 3.25. All four speed non overdrive transmissions end up at a 1 to 1 final drive ratio.
On the drivers door post the letter or numeral under the axle on the warranty plate. This will tell us what the truck left the factory with and give a starting point.
Garbz
More Turbo
Joined: Apr 2011
Posts: 707
Likes: 2
From: Sauk City, WI
You can rebuild your own 9 in, but like Garbz said it takes some doing. If you dont feel comfortable, its one of those things left to the pros.
Go look up Bad Shoe Productions if you do want to do it yourself. Ken has some great videos. I own a copy of the 9" and C6 videos. Both are far more complete than any shop manual, Ford or otherwise, that I have seen. It takes a few specialty tools, and a press, but it is doable at home if you desire.
Last I looked a Track Lock from Ford Motorsports was about $250. A Detroit is far tougher, but more expensive at about $450ish.
Go look up Bad Shoe Productions if you do want to do it yourself. Ken has some great videos. I own a copy of the 9" and C6 videos. Both are far more complete than any shop manual, Ford or otherwise, that I have seen. It takes a few specialty tools, and a press, but it is doable at home if you desire.
Last I looked a Track Lock from Ford Motorsports was about $250. A Detroit is far tougher, but more expensive at about $450ish.
Posting Guru
Joined: Oct 2007
Posts: 1,144
Likes: 0
From: Sedro-Woolley, WA
You could also look for a Dana 60.2 for a later slick. Most came with the limited slip.
I have one in my 65 and love it.
I have one in my 65 and love it.
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Fleet Mechanic
Joined: May 2012
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From: peru kansas
panther where are you located just so happens i just pulled my 60.2/60.3 it has a factory posi-trac with 4.10 gears 
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