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Old 06-22-2010, 02:20 PM   #1 (permalink)
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RWD but only one wheel spins???!!!

Again, IDK much about trucks or how a RWD operates other than the power is in the rear compared to a FWD.

But here's the odd thing: Just recently, attending a motorcycle race event (not dragstrips for you one liners ), a guy had his van's left rear wheel on a roller to bump start his race bike but the right rear wheel was touching the ground.

I was like WTF is he thinking? The right rear wheel would spin.

He started his van and gas'd it and ONLY the left rear wheel spun!

He said something to the effect that only one wheel actually puts down the power spinning the rear wheels on most RWD vehicles.

Is this true on our trucks? I never knew this. I thought both rear wheels had power spinning the wheels for RWD vehicles.

Man, you learn something new everyday!
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Old 06-22-2010, 03:28 PM   #2 (permalink)
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In a posi-traction rear end BOTH would spin. but he obviously didnt have that.

Tundras have some goofy thing that says they are limited slip but really they are NOT limited slip. So only 1 rear wheel will spin in these
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Old 06-22-2010, 03:55 PM   #3 (permalink)
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Cant an 07 spin both tires with the traction controll off?

MG
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Old 06-22-2010, 04:45 PM   #4 (permalink)
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Originally Posted by mgordon View Post
Cant an 07 spin both tires with the traction controll off?

MG
With the 5.7L, I can break traction on both, but only if I force it into a skid, like coming out of a turn. From a light, it'll only do a one-tire fire. Hence, why I want a selectable locker.
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Old 06-22-2010, 04:46 PM   #5 (permalink)
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Quote:
Originally Posted by toyodatech79 View Post
In a posi-traction rear end BOTH would spin. but he obviously didnt have that.

Tundras have some goofy thing that says they are limited slip but really they are NOT limited slip. So only 1 rear wheel will spin in these
Wow!

Did not know that. Thx.


So, is it safe to assume the left rear wheel puts the power down on our trucks?

IDK why but this thread saddens me.
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Old 06-22-2010, 04:54 PM   #6 (permalink)
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Originally Posted by Devilrey View Post
Wow!
So, is it safe to assume the left rear wheel puts the power down on our trucks?
no, it depends on which wheel has the most traction. Effectively both wheels would put down power if they had equal traction.
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Old 06-22-2010, 05:16 PM   #7 (permalink)
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^^^^ exactly!
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Old 06-22-2010, 08:15 PM   #8 (permalink)
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HowStuffWorks "How Differentials Work"

Some light reading.
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Old 06-22-2010, 08:48 PM   #9 (permalink)
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no, it depends on which wheel has the most traction. Effectively both wheels would put down power if they had equal traction.

equal traction fail, so, what would you recommend for that? I always thought equal is good.
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Old 06-22-2010, 09:29 PM   #10 (permalink)
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Quote:
Originally Posted by smmiller506 View Post
With the 5.7L, I can break traction on both, but only if I force it into a skid, like coming out of a turn. From a light, it'll only do a one-tire fire. Hence, why I want a selectable locker.
wouldn't that burn the crap out of your tires? spinning at different rates? Also might not work too well out of a corner...
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Old 06-22-2010, 09:35 PM   #11 (permalink)
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There's an ARB air locker already available and an LSD in the works.


ARB rear locker installed
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Old 06-22-2010, 10:07 PM   #12 (permalink)
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wouldn't that burn the crap out of your tires? spinning at different rates? Also might not work too well out of a corner...
Not really. They are both spinning, then they are spinning at the same RPM.

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There's an ARB air locker already available and an LSD in the works.


ARB rear locker installed
That air locker is for the 9.5" rear end with 4.10 gears. I have the 10.5" rear end with 4.30 gears. The locker was supposed to have been released for the 10.5" already, but it has been delayed. The LSD is available, however, I do not want an LSD, I want a locker. I want to be able to manually power it on or off.
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Old 06-22-2010, 10:24 PM   #13 (permalink)
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dont you manually power on/off an LSD with the trac button?
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Old 06-22-2010, 10:50 PM   #14 (permalink)
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No, the LSD engages itself automatically based on the amount of wheel slip between one tire and another. They won't engage through regular turns because the outside tire isn't really spining that much faster than the inside tire, but in mud/ice, one tire will theoretically spin much faster than the other, causing it to engage. However, if both rear tires are on ice, and both spin in place equally, causing the truck to go nowhere, the LSD will not engage, but you wouldn't notice it in your rage of being stuck.

I believe most LSD systems are based on centrifugal force, but I'm not 100% positive. Anyone wanna correct me on that?
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Old 06-23-2010, 08:19 AM   #15 (permalink)
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Quote:
Originally Posted by smmiller506 View Post
No, the LSD engages itself automatically based on the amount of wheel slip between one tire and another. They won't engage through regular turns because the outside tire isn't really spining that much faster than the inside tire, but in mud/ice, one tire will theoretically spin much faster than the other, causing it to engage. However, if both rear tires are on ice, and both spin in place equally, causing the truck to go nowhere, the LSD will not engage, but you wouldn't notice it in your rage of being stuck.

I believe most LSD systems are based on centrifugal force, but I'm not 100% positive. Anyone wanna correct me on that?
Here's a reasonably good writeup on how they work:
differential6.htm
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