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Rear Differential

Old Mar 17, 2015 | 09:23 PM
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Rear Differential

I'm trying to order a rear differential for my car but I'm not sure as to which one I should get. I have a 2010 G37x AWD...please help
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Old Mar 18, 2015 | 09:41 AM
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Will a locked rear differential keep the transmission from engaging?
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Old Mar 18, 2015 | 12:18 PM
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If your are changing gear ratio, you will need to change the front also.
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Old Mar 18, 2015 | 02:19 PM
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IIRC It has been done already. Just get the sport vlsd which is the same ratio and you are good to go.
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Old Mar 18, 2015 | 02:37 PM
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Originally Posted by HoldmyMouse

IIRC It has been done already. Just get the sport vlsd which is the same ratio and you are good to go.
Why would he be OK putting a VLSD in his AWD model?

2010 Infiniti G37 Coupe Specifications | Infinitihelp.com
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Old Mar 18, 2015 | 03:21 PM
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Originally Posted by vqsmile
Why would he be OK putting a VLSD in his AWD model?

2010 Infiniti G37 Coupe Specifications | Infinitihelp.com
Because 7sp auto sport has the same fd ratio as the x.
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Old Mar 18, 2015 | 06:34 PM
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Originally Posted by HoldmyMouse

Because 7sp auto sport has the same fd ratio as the x.
. . . and what about the vlsd ?
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Old Mar 18, 2015 | 07:21 PM
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Originally Posted by vqsmile
. . . and what about the vlsd ?
This is a hot topic and I personally think the VLSD will throw off the sensors and everything with the AWD system. The system is sensitive and can't even have over 1% difference in front to rear tire diameter so I have a hard time thinking this would be a painless swap, or even beneficial.

I see the benefit of changing the final drive, but you certainly cannot do this on the AWD without changing the front, and there isn't any parts available for that. The traction, stability, and AWD system are going to make the LSD unnoticeable, even if the swap works perfectly.

Even though Infiniti says that the xS coupe gets an LSD, I would love to see someone jack up their rear end and spin one wheel to prove it once and for all.
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Old Mar 18, 2015 | 07:54 PM
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Originally Posted by Ryne
This is a hot topic and I personally think the VLSD will throw off the sensors and everything with the AWD system. The system is sensitive and can't even have over 1% difference in front to rear tire diameter so I have a hard time thinking this would be a painless swap, or even beneficial.

I see the benefit of changing the final drive, but you certainly cannot do this on the AWD without changing the front, and there isn't any parts available for that. The traction, stability, and AWD system are going to make the LSD unnoticeable, even if the swap works perfectly.

Even though Infiniti says that the xS coupe gets an LSD, I would love to see someone jack up their rear end and spin one wheel to prove it once and for all.
My thoughts exactly. They didn't even offer the VLSD in the X coupe until 2012, and given the complexity of the system, I just don't see how one can assume that the AWD control system calibration for a 2010 model will react favorably with a retrofit.
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Old Mar 18, 2015 | 09:02 PM
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Quick search shows I did recall correctly it has been done.
https://www.myg37.com/forums/engine-...-on-awd-g.html

You need to understand VLSD is not as potent as a mechanical LSD so the locking action isn't as strong. Slippage will still go through but will be in a more limited fashion which should not interfere (as much or even at all) with the AWD computer.
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Old Mar 19, 2015 | 12:01 AM
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I just had a question after searching and looking up specs on the final drive.

Are all 7AT LSD all 3.357?
Have they ever made 7AT LSD with 3.69?

I am looking for the 3.357 LSD diff, and I wanted to make sure as the place I am looking doesn't say if it has 3.357.
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Old Mar 19, 2015 | 12:34 AM
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07-08 5AT has 3.692 should be direct bolt on with no messing with changing any flanges but only if you are Rwd
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Old Mar 19, 2015 | 12:58 AM
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Originally Posted by HoldmyMouse
Quick search shows I did recall correctly it has been done.
https://www.myg37.com/forums/engine-...-on-awd-g.html

You need to understand VLSD is not as potent as a mechanical LSD so the locking action isn't as strong. Slippage will still go through but will be in a more limited fashion which should not interfere (as much or even at all) with the AWD computer.
Maybe you're right, but it could also just be empirical evidence, and a very limited sample at that.
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Old Mar 19, 2015 | 10:15 AM
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VLSD turns into an open diff once it gets some miles on it, something around 60-80k. It cannot be fixed as it's a sealed unit. If I was replacing mine, I'd throw on higher final drive one, like 4.08. Although I have no idea how it would work on awd, I've replaced a few diffs but it was always on rwd cars.
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Old Apr 10, 2015 | 09:57 AM
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Ok, thanks guys but I have another question. I just found out the that the rear differential has seized up. Not sure if any gears have been stripped or anything but any suggestions on the steps I need to take to fix this or do I just buy a new differential?
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