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Why do our trucks need an aftermarket LSD? Don't our truck already have an automatic LSD. What's so good about the auburn one?

Thanks guys sorry for the newb questions. And not sure if it matters but I have a 2013 5.7 CM 4x4 with tow package
 

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Um.

So, no one else has responded.
BECAUSE

this has been talked about almost as many times as the nannies.

ALSD, not automatic lsd. ALSD it means the brakes try to slow the high spinning tire to make the one with traction engage.
 

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As for traction, none of the 07+ Tundras come with an LSD (Posi), The factory “Electronic LSD” is just traction control, and is more “P.O.S.” than “POSI”. All tundras can benefit from the increased traction that an aftermarket LSD or Locker will provide. Another benefit is strength.
The Tundra uses a huge 10.5” diff that is much larger than any other ½ ton pickup produced. The problem is the factory Standard Open (non-posi) carrier is very weak by design, and has already failed in many stock pickups, this is all the more reason to add An Auburn Pro LSD ($545) or an ARB Air Locker ($1075) to the rear.
 

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Because the OEM differential cannot do this. A quick search should give a lot of results.

 
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