2 way differential whine around 45mph... Anybody else? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

az_240 · 04-27-2007, 11:51 PM

I've got a 2 way cusco type MZ diff that will whine from about 45-60mph.
It goes away but then makes a louder whining sound around 80mph.

I put some shims around the diff bushings to make them nice and tight... but I dont think that alone will create a whine.

The guy that had the diff before me claims he never had any problems with whining from the diff at all...

I have dropped this diff 3 different times now and tried bolting it on different everytime with no change.

I also have stock suspension besides a ST sway bar and subfame collars.

Any help is appreciated.

Thanks

Dousan_PG · 04-28-2007, 12:11 AM

no sir
quiet as can be!
your ring gear might be going...

az_240 · 04-28-2007, 01:09 AM

I inspected everything inside the diff housing... everything including the ring gear looked fine

20 til 3 · 04-28-2007, 01:11 AM

what fluids are you putting back in it?

az_240 · 04-28-2007, 01:18 AM

redline.... whatever is recommended.... i think its 75w90 or something.... with the ford friction modifier.
At first it had a thicker oil... redline 75w140 iirc

20 til 3 · 04-28-2007, 01:26 AM

so you went from a thicker oil to a thinner? imo i think you might want to run the thicker stuff again, i'm no expert but process of elimination would come into play before spending a bunch on a new diff

az_240 · 04-28-2007, 01:46 AM

it made no difference what oil I used.... still made the same whine

Dousan_PG · 04-28-2007, 01:48 AM

pinion bearing or output bearings could lead to whine

drift freaq · 04-28-2007, 02:00 AM

if you don't fix it, it will get worse and go boom. At which point you will wind up with a possible jacked ring and pinion and chunks of metal floating in your diff case. Which is not good for the clutch pack.

az_240 · 04-28-2007, 02:46 AM

^exactly why I want to figure out what it is.... the whining itself I can take i just dont want to ruin my $800 diff.

Im gona have a chat with the mechanics at my work tomorrow and see what they say

Thanks for the replys

scottie · 04-28-2007, 07:10 AM

I had the same thing happen to mine. The tooth gap was not correct. There is supposed to be a specific amount of "play" the diff is suppose to have. You should be able to turn the input shaft (driveshaft) and the output shafts (axles) and there will be or should be some play before the teeth catch. It its off by even the smallest of margins, your diff will whine. I would check that if i were you.

Scott

Dousan_PG · 04-28-2007, 08:09 AM

get another open diff and swap the lsd
see if that fixes it.
cost is nothing
time is maybe a few hours.

az_240 · 04-28-2007, 10:39 PM

I was gona do what Dousan suggested but I talked to some mechanics today and they said more than likely it is because of what Scottie is describing.... the diff is not configured correctly inside the housing and the teeth are slightly off....
Im gona drop the diff again and put some dye on the teeth to see how the mating pattern looks....
Then Im going to try calling some off road shops to see if they can help me since the transmission guy at my work will be busy for a while.

Thanks again for the help!

*!Zar!* · 04-29-2007, 10:59 AM

So, you bought a diff, tossed it in, and didn't check your backlash?

Uuuggghhh

Scottie is right. Since Scottie is right, Dousan is starting to be right being as how you are in the process of destroying your gear. You need a dial indicator and the dye to get your diff the way it needs to be. To adjust the backlash, you'll need shims. To either raise or lower the pinion untill it's where it needs to be. Being as how you are hearing a whining, it's more than likely too tight. So you might not need to buy any shims.

Either way, drive the car only to the shop.

az_240 · 05-01-2007, 04:38 PM

mechanic said it wont do anything bad to the diff... just an annoying sound.

Dousan_PG · 05-01-2007, 05:20 PM

hahaha
great mechanic!

Sir · 05-01-2007, 05:31 PM

LOL.
That backlash issue will kill the diff.
All you need is right sized shims and someone who understands diffs.

04-27-2007, 11:51 PM	#1
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	2 way differential whine around 45mph... Anybody else? I've got a 2 way cusco type MZ diff that will whine from about 45-60mph. It goes away but then makes a louder whining sound around 80mph. I put some shims around the diff bushings to make them nice and tight... but I dont think that alone will create a whine. The guy that had the diff before me claims he never had any problems with whining from the diff at all... I have dropped this diff 3 different times now and tried bolting it on different everytime with no change. I also have stock suspension besides a ST sway bar and subfame collars. Any help is appreciated. Thanks

04-28-2007, 12:11 AM	#2
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 42 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	no sir quiet as can be! your ring gear might be going... __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

04-28-2007, 01:48 AM	#8
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 42 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	pinion bearing or output bearings could lead to whine __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

04-28-2007, 02:00 AM	#9
drift freaq R.I.P. Aya, always love Join Date: Nov 2001 Location: Los Feliz/Hollywood Posts: 18,558 Trader Rating: (215) Rides Gallery: drift freaq Feedback Score: 215 reviews	if you don't fix it, it will get worse and go boom. At which point you will wind up with a possible jacked ring and pinion and chunks of metal floating in your diff case. Which is not good for the clutch pack. __________________ "Having a lot of tracks on a song is like putting stickers on a car to get more horsepower" New Video https://www.youtube.com/watch?v=uebV1OnbRsw Buy my mounts! http://zilvia.net/f/sale-items/51531...ns-mounts.html http://zilvia.net/f/tech-talk/317539...e-mouts-6.html

04-28-2007, 08:09 AM	#12
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 42 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	get another open diff and swap the lsd see if that fixes it. cost is nothing time is maybe a few hours. __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

04-28-2007, 01:09 AM	#3
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	I inspected everything inside the diff housing... everything including the ring gear looked fine

04-28-2007, 01:11 AM	#4
20 til 3 Zilvia Addict Join Date: Nov 2006 Location: Sioux falls SD Age: 33 Posts: 661 Trader Rating: (2) Feedback Score: 2 reviews	what fluids are you putting back in it?

04-28-2007, 01:18 AM	#5
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	redline.... whatever is recommended.... i think its 75w90 or something.... with the ford friction modifier. At first it had a thicker oil... redline 75w140 iirc

04-28-2007, 01:26 AM	#6
20 til 3 Zilvia Addict Join Date: Nov 2006 Location: Sioux falls SD Age: 33 Posts: 661 Trader Rating: (2) Feedback Score: 2 reviews	so you went from a thicker oil to a thinner? imo i think you might want to run the thicker stuff again, i'm no expert but process of elimination would come into play before spending a bunch on a new diff

04-28-2007, 01:46 AM	#7
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	it made no difference what oil I used.... still made the same whine

04-28-2007, 02:46 AM	#10
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	^exactly why I want to figure out what it is.... the whining itself I can take i just dont want to ruin my $800 diff. Im gona have a chat with the mechanics at my work tomorrow and see what they say Thanks for the replys

04-28-2007, 07:10 AM	#11
scottie Zilvia FREAK! Join Date: Nov 2003 Location: asluT Posts: 1,287 Trader Rating: (11) Feedback Score: 11 reviews	I had the same thing happen to mine. The tooth gap was not correct. There is supposed to be a specific amount of "play" the diff is suppose to have. You should be able to turn the input shaft (driveshaft) and the output shafts (axles) and there will be or should be some play before the teeth catch. It its off by even the smallest of margins, your diff will whine. I would check that if i were you. Scott

04-28-2007, 10:39 PM	#13
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	I was gona do what Dousan suggested but I talked to some mechanics today and they said more than likely it is because of what Scottie is describing.... the diff is not configured correctly inside the housing and the teeth are slightly off.... Im gona drop the diff again and put some dye on the teeth to see how the mating pattern looks.... Then Im going to try calling some off road shops to see if they can help me since the transmission guy at my work will be busy for a while. Thanks again for the help!

04-29-2007, 10:59 AM	#14
!Zar! Premium Member Join Date: Nov 2004 Location: North Korea Posts: 14,576 Trader Rating: (27) Feedback Score: 27 reviews	So, you bought a diff, tossed it in, and didn't check your backlash? Uuuggghhh Scottie is right. Since Scottie is right, Dousan is starting to be right being as how you are in the process of destroying your gear. You need a dial indicator and the dye to get your diff the way it needs to be. To adjust the backlash, you'll need shims. To either raise or lower the pinion untill it's where it needs to be. Being as how you are hearing a whining, it's more than likely too tight. So you might not need to buy any shims. Either way, drive the car only to the shop. __________________

05-01-2007, 04:38 PM	#15
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	mechanic said it wont do anything bad to the diff... just an annoying sound.

05-01-2007, 05:20 PM	#16
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 42 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	hahaha great mechanic! __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

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