rear end question
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Elder User
Joined: Jul 2012
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From: Poplar Bluff, MO
rear end question
my truck has a limited slip rear end, (96 5.0 4x4 f150) but the motor puts out more power than stock.. well the other day i was killlin tires and it broke posi like no bodys business and it does it everytime now.. one of my buddys was like theres no way thats a limited slip b/c it broke posi to easy.. then he asked if i had welded the rear end? whats he mean?
Fleet Mechanic
Joined: Nov 2007
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From: Colorado
I am not sure what you mean by broke posi (I have a guess, but not sure).
Welding the rear end refers to welding the differential gears together. This way, both rear tires receive maximum power. It is a permanent locker, and only good for dedicated trail/bogging rigs. It is not good for street use.
Welding the rear end refers to welding the differential gears together. This way, both rear tires receive maximum power. It is a permanent locker, and only good for dedicated trail/bogging rigs. It is not good for street use.
New User
Joined: Nov 2012
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When you weld a rearend the diffrential is completley solid from one wheel to the other so essentially it creates one solid axle it is sometimes common on pulling tractors but it is hard to turn because both wheeles spin at the same rate its basically useless on street vehicles. i would say you probably just have a strong motor and a good rearend because chances are its not welded
Logistics Pro
Joined: Mar 2012
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From: Oregon
Your rear end is NOT a Posi unit. That's a GM thing. Your limited slip uses clutches to lock the wheels together. They have their limits though. And over time those limit's become less and less due to wear. Your is probably worn out and is getting too much power to handle it. My suggestion: Rebuild it and stop trying to be a hooligan spinning the wheels all the time. That rubber isn't cheap...
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Elder User
Joined: Jul 2012
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From: Poplar Bluff, MO
ahh evan your no fun haha jk grandpa owns a tire shop and had a set layin around and he let me have em to kill, but as for what i mean on pullin a posi i peeled out and instead of having 1 tire spin since my rear ends a limited slip both did.. and it wasnt even from brake torque
Senior User
Joined: Dec 2012
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From: Coastal Washington State
I believe what he was trying to say is "posi" or positraction is the name for some GM limited slip units. Trac Loc is a name for Ford units at least older 9" ones. I haven't kept up on newer terminology. Typically a stock type unit functions off clutch or cone operation to achieve a suitable amount of friction to provide enough holding power under most conditions but still release to allow the wheels to spin at different speeds when needed. Like when turning a corner. A traction unit in good condition will usually spin both tires equally while going in a straight line. After enough wear they will "loosen up" or start to spin one tire like an open differential. Because the clutches can't provide enough holding power. a locker type unit is not as quiet or smooth but is a good choice for vehicles used aggressively. Welding the gears is a poor choice in my opinion even for a trail rig because you never know when it may break loose and cause rearend failure or break an axle.
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Logistics Pro
Joined: Mar 2011
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From: Central Wisconsin
Daniel5.0, no you don't.
OP, you're saying that both tires bit instead of just one, correct? If that's so, that means your limited slip unit is working correctly. And, perhaps, somebody may have rebuilt the clutch pack in it recently and shimmed them tighter so they grab better. Not positive on that last part because I wasn't there to see.
OldGrayFord, I believe these units are still called Trac Loc. And I agree that welding diffs is bad.
OP, you're saying that both tires bit instead of just one, correct? If that's so, that means your limited slip unit is working correctly. And, perhaps, somebody may have rebuilt the clutch pack in it recently and shimmed them tighter so they grab better. Not positive on that last part because I wasn't there to see.
OldGrayFord, I believe these units are still called Trac Loc. And I agree that welding diffs is bad.
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Elder User
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From: Poplar Bluff, MO
This is as bout as simple as I can put it.. Used to with my factory 5.0 when I tried to burn out only one wheel would spin.. But now I have a motor out of a mustang which is a little more hp and when I did a burnout both wheels spun instead of just 1...
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