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#1 (permalink) Old 12-28-2008, 04:47 AM
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Limited slip differential

Members,

Just researching my potential purchase of a 4.3, and I noticed that unlike my 4.2, a limited slip diff is not available on 4wd models, but is available on 2wd. I will openly admit that I need some education in this area. Can anyone explain why this is?

Rev
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#2 (permalink) Old 12-28-2008, 06:00 AM
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What Toyota says is on the 2WD is NOT a "Limited Slip Differential". It's a standard open differential with traction control, which for some makes Toyota think they can call it an LSD which I find shameful. You might want to check out this thread here:

http://rav4world.com/forums/viewtopic.php?t=18976


Toyota uses an electromagnetically controlled clutch to engage or disengage the part-time 4WD system so that they can disengage the rear axle for better efficiency. You can't do this with a limited slip center differential.

Steve
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#3 (permalink) Old 12-28-2008, 03:20 PM
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The AWD 4.2 used a viscous limited-slip centre differential, with a limited-slip rear differential optional. These mechanical diffs should not be confused with what Toyota calls "Auto LSD", which is their name for a common technology that uses a special mode of the traction control to try and simulate a real LSD. The idea is to give the FWD model a little extra capability in situations where AWD would have been an advantage - the manual tells you to use Auto LSD only in "high resistance surface conditions" like gravel or sand.
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#4 (permalink) Old 12-29-2008, 01:16 PM
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Quote:
Originally Posted by bmorton
the manual tells you to use Auto LSD only in "high resistance surface conditions" like gravel or sand.
LOL -I think the manual has a typo. I always thought those were "low resistance" - how come my trucklet always tries to get sideways?

"High resistance" is dry, clean pavement or concrete.

John E Davies
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#5 (permalink) Old 12-29-2008, 02:37 PM
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I just think they're smoking crack on this whole "Auto LSD" thing, which is probably why the manual doesn't even make sense either. :P

Where can I find a service manual that would actually cover this? I want to see exactly what it says in there on this.
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#6 (permalink) Old 12-29-2008, 05:27 PM
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Quote:
Originally Posted by John E Davies
LOL -I think the manual has a typo. I always thought those were "low resistance" - how come my trucklet always tries to get sideways?

"High resistance" is dry, clean pavement or concrete.
High resistance refers to the vehicle having to push its way through something that resists its movement. Dry, clean pavement would offer very low resistance. We had 10" of wet snow fall last week and making my way through that was a good example of a high-resistance situation.
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