Differantial - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Armin93 · 02-24-2017, 11:09 AM

Hey guys

So i realised that my diff has some backlash.
Which my tuner and mechanic confirmed as well. Its not an urgent problem to fix but replacing the diff would cost around $2000.
I was wondering if anyone knows how to fix the backlash?

Cheers

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Tcoat · 02-24-2017, 11:17 AM

How much is "some"? Some is expected and normal in a RWD system but if excessive then it could be a problem.

Here is some stuff you can look at.
http://www.cusco.co.jp/en/news/toyot...z_rear_di.html

humfrz · 02-24-2017, 11:47 AM

Well, like Tcoat said, some backlash is normal.

How many miles on your car .. ??

Do you have any major power mods .. ??

Is it still under warranty .. ??

Do you notice it under normal driving conditions .. ??

Can you notice (hear/feel) a "clunk" when starting off after a gear change .. ??

Come back.

humfrz

Ultramaroon · 02-24-2017, 05:03 PM

If it doesn't make noise it's fine.

DAEMANO · 02-24-2017, 05:18 PM

Quote:

Originally Posted by Ultramaroon

If it doesn't make noise it's fine.

Seconded here. If it's not humming at speed or clunking you're probably ok. Setting up/installing a diff is covered in many videos on YouTube and even a few DIY articles on this site. (video below).

If you're going to fix it yourself and the whole thing is hosed. A used diff + housing and all the rest goes for about $500 on Ebay. It's a direct swap.

If it's just the Ring and pinion/final drive + seals is going to run you about $1400 including labor to fix (unfortunately, I know this first hand).

If you're suspicious about this TAKE IT TO A SPECIALIST or a mechanic that works on differentials all day. Someone that can diagnose it quickly and source parts just as fast. This will likely save you money over a general mechanic who sees a diff 1x month or less.

At 52 seconds they show the backlash being adjusted.
[ame="https://www.youtube.com/watch?v=smbq-vkuIL4"]TOMEI Trax LSD Installation guide by SFR (2 of 3) - YouTube[/ame]

StraightOuttaCanadaEh · 02-24-2017, 05:47 PM

what's backlash?

ToySub1946 · 02-24-2017, 05:56 PM

Backlash is a political term.

On here, we're not allowed to go there.

Armin93 · 02-24-2017, 07:45 PM

The car has about 45 thousand miles on it.
And yes after a gear change i hear a clunk on first, second and sometimes third gear.
The clunk is worse when the car is cold but it almost happens all the time

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Ultramaroon · 02-24-2017, 07:59 PM

Quote:

Originally Posted by Armin93

The car has about 45 thousand miles on it.
And yes after a gear change i hear a clunk on first, second and sometimes third gear.
The clunk is worse when the car is cold but it almost happens all the time.

I have it too. Always had it. It's not specifically from the diff but is the sum total of the lash in the whole drive train. Most of that comes from the transmission.

Does your transmission whine at all?

stevesnj · 02-24-2017, 11:17 PM

Yeh no backlash at all in the drivetrain is no good. When 4 wheeling my LandCruiser its needed to prevent binding of the u-joints and pinion gear. When i lock my front and rear diffs no backlash would be bad.

churchx · 02-25-2017, 02:01 AM

Wasn't clunk when engaging in gear more related to our multi-piece drive-shaft? IIRC some reported clunking gone if installed single-pice aftermarket ones.

Ultramaroon · 02-25-2017, 02:07 AM

Quote:

Originally Posted by churchx

Wasn't clunk when engaging in gear more related to our multi-piece drive-shaft? IIRC some reported clunking gone if installed single-pice aftermarket ones.

Absolutely not. I remember one person who claimed that but I didn't call bullshit because I didn't want to get into it with him. If there's any lash at all between the transmission and the diff, something is very wrong; dangerously wrong.

humfrz · 02-25-2017, 04:24 AM

Quote:

Originally Posted by Armin93

The car has about 45 thousand miles on it.
And yes after a gear change i hear a clunk on first, second and sometimes third gear.
The clunk is worse when the car is cold but it almost happens all the time

Sent from my iPhone using Tapatalk

I would suggest you drive another twin with a MT for a comparison.

The noise you hear may be normal for the drivetrain.

humfrz

02-24-2017, 11:09 AM	#1
Armin93 Member Join Date: Feb 2017 Drives: Toyota 86 GTS Location: Sydney NSW Posts: 30 Thanks: 2 Thanked 5 Times in 2 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Differantial Hey guys So i realised that my diff has some backlash. Which my tuner and mechanic confirmed as well. Its not an urgent problem to fix but replacing the diff would cost around $2000. I was wondering if anyone knows how to fix the backlash? Cheers Sent from my iPhone using Tapatalk

02-24-2017, 11:17 AM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	How much is "some"? Some is expected and normal in a RWD system but if excessive then it could be a problem. Here is some stuff you can look at. http://www.cusco.co.jp/en/news/toyot...z_rear_di.html __________________ Racecar spelled backwards is Racecar, because Racecar.

02-24-2017, 05:03 PM	#4
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	If it doesn't make noise it's fine. __________________ service manuals

02-24-2017, 11:17 PM	#10
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	Yeh no backlash at all in the drivetrain is no good. When 4 wheeling my LandCruiser its needed to prevent binding of the u-joints and pinion gear. When i lock my front and rear diffs no backlash would be bad. __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

02-24-2017, 11:47 AM	#3
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Well, like Tcoat said, some backlash is normal. How many miles on your car .. ?? Do you have any major power mods .. ?? Is it still under warranty .. ?? Do you notice it under normal driving conditions .. ?? Can you notice (hear/feel) a "clunk" when starting off after a gear change .. ?? Come back. humfrz

02-24-2017, 05:47 PM	#6
StraightOuttaCanadaEh Wes Join Date: Feb 2017 Drives: Artisan Spirits '17 86 Location: Toronto Posts: 2,871 Thanks: 1,255 Thanked 1,734 Times in 1,025 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	what's backlash?

02-24-2017, 05:56 PM	#7
ToySub1946 Senior Member Join Date: Oct 2014 Drives: 15FRS, 05MustangGT, 85Toyota truck Location: Eureka, Ca. Posts: 573 Thanks: 672 Thanked 590 Times in 279 Posts Mentioned: 5 Post(s) Tagged: 1 Thread(s)	Backlash is a political term. On here, we're not allowed to go there.

02-24-2017, 07:45 PM	#8
Armin93 Member Join Date: Feb 2017 Drives: Toyota 86 GTS Location: Sydney NSW Posts: 30 Thanks: 2 Thanked 5 Times in 2 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	The car has about 45 thousand miles on it. And yes after a gear change i hear a clunk on first, second and sometimes third gear. The clunk is worse when the car is cold but it almost happens all the time Sent from my iPhone using Tapatalk

02-25-2017, 02:01 AM	#11
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,334 Thanks: 698 Thanked 2,086 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Wasn't clunk when engaging in gear more related to our multi-piece drive-shaft? IIRC some reported clunking gone if installed single-pice aftermarket ones.

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