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I think my 2011 rear end was replaced with a LSD mechanical rear differential ???

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Old 02-10-2013, 01:31 PM   #1
KJaikaran [OP] KJaikaran is offline
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I think my 2011 rear end was replaced with a LSD mechanical rear differential ???

2011 DCSB TRD Sport.

Was in an accident where the other driver clipped my rear tire pushing it back and causing a lot of damage to rear end. Everything was practically replaced for precaution, including rear axle housing and differential.

I have been getting some weird noise/vibrations in rear end similar to post i have seen with people experiencing the same thing with the 08 and previous models having to add friction modifier.

So i think i have an LSD rear differential now. Went to change the oil today and noticed the use LSD oil only. Jacked it put the car in neutral and turned on back wheel heard something engage and both wheels are spinning in the same direction.

So if this is the case i cant believe they would put in the wrong rear end.

Could this possibly be a good thing ? I have no idea what i can expect with the electronic LSD it has plus possibly a mechanical LSD.

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Old 02-10-2013, 01:40 PM   #2
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Take it back and ask them to verify the correct part number was installed.
The electronic diff is going to be tied into the ABS and traction control systems.
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Old 02-10-2013, 01:40 PM   #3
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You scored.
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Old 02-10-2013, 03:28 PM   #4
KJaikaran [OP] KJaikaran is offline
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Changed oil and added friction modifier and the weird vibration I was getting while turning slowly is gone.
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Old 02-10-2013, 03:44 PM   #5
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I would really be smiling if I got a free mechanical limited slip in my Sport Tacoma like that!

ETA: I think the electronics LSD will only kick in if the mechanical one doesn't. I don't see how it will be a problem unless the electronic tries to kick in first. or some situation where they're fighting against each other. Not sure...
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Old 02-10-2013, 06:03 PM   #6
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score!
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Old 02-10-2013, 07:54 PM   #8
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Dont say shit to the dealer lol
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Old 02-10-2013, 08:34 PM   #10
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lol, I was mad at first with the issues i was having, but i guess it all worked out for the best. If i didn't try and find out the problem and find the post about people having the same issue's with the mechanical differentials in the 08 and previous models that just needed friction modifier i would have ended up back at the dealer trying to let them figure out what the binding noise was and i could have possibly lost the mechanical diff.

Did some more research and i don't really see a reason for the electronic lsd to cause any issues with the mechanical if its technically working through the abs.

Feels great to have the truck back !

Any other way i could confirm without opening it up ?
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Old 02-11-2013, 05:06 AM   #11
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Quote:
Originally Posted by KJaikaran View Post
Any other way i could confirm without opening it up ?
Jack the rear end up so both rear tires are off the ground and spin one wheel. If the one on the other side goes the opposite direction you have an open differential. If the one on the other spins the same direction you have a limited slip.
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Old 02-11-2013, 05:23 AM   #12
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Quote:
Originally Posted by P9HST2 View Post
Jack the rear end up so both rear tires are off the ground and spin one wheel. If the one on the other side goes the opposite direction you have an open differential. If the one on the other spins the same direction you have a limited slip.
This isn't always accurate. My 2000 Tacoma would spin both tires the same direction and it was an open diff.
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Old 02-11-2013, 05:50 AM   #13
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Quote:
Originally Posted by 8BoltRacing View Post
Lucky dogg.. I would trade my e-locker for a mech LSD in a heartbeat..
Really? Why? If my truck had a mechanical lsd, i would be driving across state to see you right now!
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Old 02-11-2013, 06:29 AM   #14
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A possible downside is more frequent diff fluid changes.

I believe the maintenance plan from the manual calls for a 30k mile fluid change for vehicles with mechanical lsd as regardless of normal use versus severe use. This may be due to the friction modifier breaking down because of shearing of the fluid.

In contrast, I think the plan suggests 30k mile change for e-lsd for severe use only and an extended fluid change for normal use.

Don't quote me on this, however. I am away from my vehicle and can't confirm the manual states this.
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Old 02-11-2013, 07:04 AM   #15
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Yah, I read up on it and they said it doesn't necessarily mean you have a mechanical LSD if both tires spin in same direction. So now i'm wondering how else i could check without opening it up.

Quote:
Originally Posted by chris4x4 View Post
This isn't always accurate. My 2000 Tacoma would spin both tires the same direction and it was an open diff.
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Old 02-11-2013, 07:05 AM   #16
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Quote:
Originally Posted by P9HST2 View Post
Jack the rear end up so both rear tires are off the ground and spin one wheel. If the one on the other side goes the opposite direction you have an open differential. If the one on the other spins the same direction you have a limited slip.
First thing i actually did. Both spun in same direction, but it seems like its not an accurate way of checking.
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Old 02-11-2013, 07:45 AM   #17
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Quote:
Originally Posted by KJaikaran View Post
Yah, I read up on it and they said it doesn't necessarily mean you have a mechanical LSD if both tires spin in same direction. So now i'm wondering how else i could check without opening it up.
Open the fill hole and insert something like this.

http://www.amazon.com/Waterproof-Fle.../dp/B006SNRUL0
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Old 02-11-2013, 09:25 AM   #19
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check it the fun way.. lay down some rubber. :-)
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Old 02-12-2013, 07:36 AM   #20
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Quote:
Originally Posted by nelztaco View Post
Really? Why? If my truck had a mechanical lsd, i would be driving across state to see you right now!
In the 5 years ive owned her ive never taken it off-roading.. I would like to sometime but nothing serious just to ride some trails and such. I rarely ever get into a situation that calls for me to lock the diff (and having the LSD would probly solve that problem before it happens)..I do it now and then just to cycle it and make sure it still works. I would much rather have a full time LSD that turns both.
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