limited slip differential
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limited slip differential
I have a 1986 F250 351W, manual 5-speed. I'd like to replace the open diff with a locking or limited slip. The truck will work off-road and do some towing.
Should I just browse the wrecking yards for a Ford unit, or is there a better option?
Thanks for your thoughts
G-Gordon
Should I just browse the wrecking yards for a Ford unit, or is there a better option?
Thanks for your thoughts
G-Gordon
Postmaster
Joined: Dec 2002
Posts: 3,959
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From: USA
There are better limited slip diffs available aftermarket. You may get a Ford Trac Lok for cheap at the wreckers and then rebuild it with new clutches and end up spending less than buying a new one though.
Assuming your F250 has the Ford 10.25" rear axle, the clutch type limited slip choices for it are: Ford Trac Lok, Eaton Posi (www.eaton.com), and Auburn (www.auburngear.com).
A worm-gear limited slip is also available: TracTech TrueTrac (www.tractech.com).
If you prefer an automatic locker, there are two available: the Detroit Locker (www.tractech.com), and the Lock Right (www.powertrax.com).
If you're interested in a selectable locker that you can turn on and off, there are two: the ARB Air Locker (www.arb.com), and the TracTech Electrac (www.tractech.com).
To see all the choices in one place with descriptions of how they work, applications, and pricing available, check out www.reiderracing.com and www.ring-pinion.com.
I have the Lock Right in my F350 and really like it.
Assuming your F250 has the Ford 10.25" rear axle, the clutch type limited slip choices for it are: Ford Trac Lok, Eaton Posi (www.eaton.com), and Auburn (www.auburngear.com).
A worm-gear limited slip is also available: TracTech TrueTrac (www.tractech.com).
If you prefer an automatic locker, there are two available: the Detroit Locker (www.tractech.com), and the Lock Right (www.powertrax.com).
If you're interested in a selectable locker that you can turn on and off, there are two: the ARB Air Locker (www.arb.com), and the TracTech Electrac (www.tractech.com).
To see all the choices in one place with descriptions of how they work, applications, and pricing available, check out www.reiderracing.com and www.ring-pinion.com.
I have the Lock Right in my F350 and really like it.
Junior User
Joined: Jul 2004
Posts: 72
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From: nw PA
socal, How is the lock right on the street? I have been thinking about getting one for my 76 but I want to hear some feed back. I currently am getting the rear end rebuilt now, but I don't want to put it back together until I have some sort of posi in there.
Postmaster
Joined: Dec 2002
Posts: 3,959
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From: USA
The Lock Right does fine on the street in my truck. You will hear the normal click click click from it when you make a tight turn and it will clunk a little when going from coasting to accelerating, but the noise isn't bad and I got used to it quickly. I also got used to using a light foot on the gas when exiting right hand turns when the truck is empty so I wouldn't be chirping my tires all the time.
Sometimes it takes a little more steering input to hold a curve while accelerating (like on a curved freeway on ramp), since the differential likes to stay locked when power is applied. It's nothing bad and in my opinion not a reason to overlook a locker, just something to get used to with it. Once you're used to it, you won't even notice it.
If you drive in a lot of snow and ice though, you may want to get a limited slip instead. The locker does like to keep the rear tires locked together as much as it can, so it can cause the back end to get loose, especially if the truck is unloaded.
Hope that helps ya.
Sometimes it takes a little more steering input to hold a curve while accelerating (like on a curved freeway on ramp), since the differential likes to stay locked when power is applied. It's nothing bad and in my opinion not a reason to overlook a locker, just something to get used to with it. Once you're used to it, you won't even notice it.
If you drive in a lot of snow and ice though, you may want to get a limited slip instead. The locker does like to keep the rear tires locked together as much as it can, so it can cause the back end to get loose, especially if the truck is unloaded.
Hope that helps ya.
choice is great
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