Advice needed for differential install

Mn23 · 05-06-2021, 11:44 PM

Hey guys,

Just had my differential rebuilt with new 4.08 gears, seals and bearings on my track 370Z because of the loud whining/howling noise during acceleration most likely due to the overheating of the ring gears on the track without a diff cooler. Now I have everything installed with diff cooler but after a few nice QUIET track days, the noise came back! (Diff cooler has been working fine cooling the temp down)
Now I’ve been told another rebuild is necessary with all new gears and parts again as a proper backlash or other adjustments will be needed for a track abuse diff. Can anyone advice why the noise came back and do I really need to get new gears seals and bearings again ?

Thanks

JARblue · 05-07-2021, 08:43 AM

What diff? Some diffs are loud without the proper lube, like the OS Giken.

Rusty · 05-07-2021, 09:48 AM

What was the backlash? Did you check the toe pattern? Sounds like the pinion depth isn't right.

Mn23 · 05-09-2021, 09:02 AM

Need to check with my mechanic about the backlash but he did make sure the pattern is correct. It was nice and quiet after the installation for about 600km though. My concern is could this be fixed by readjusting it or I really need to get new pinion gears again.

Rusty · 05-09-2021, 02:24 PM

You won't know until you tear it apart.

05-06-2021, 11:44 PM	#1 (permalink)
Mn23 Base Member Join Date: Jun 2016 Location: GTA Posts: 49 Drives: 17 Black 370Z Rep Power: 9	Advice needed for differential install Hey guys, Just had my differential rebuilt with new 4.08 gears, seals and bearings on my track 370Z because of the loud whining/howling noise during acceleration most likely due to the overheating of the ring gears on the track without a diff cooler. Now I have everything installed with diff cooler but after a few nice QUIET track days, the noise came back! (Diff cooler has been working fine cooling the temp down) Now I’ve been told another rebuild is necessary with all new gears and parts again as a proper backlash or other adjustments will be needed for a track abuse diff. Can anyone advice why the noise came back and do I really need to get new gears seals and bearings again ? Thanks

05-07-2021, 08:43 AM	#2 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	What diff? Some diffs are loud without the proper lube, like the OS Giken. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

05-07-2021, 09:48 AM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,180 Drives: 2011 Nismo GM 6M Rep Power: 2684437	What was the backlash? Did you check the toe pattern? Sounds like the pinion depth isn't right. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-09-2021, 02:24 PM	#5 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,180 Drives: 2011 Nismo GM 6M Rep Power: 2684437	You won't know until you tear it apart. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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05-09-2021, 09:02 AM	#4 (permalink)
Mn23 Base Member Join Date: Jun 2016 Location: GTA Posts: 49 Drives: 17 Black 370Z Rep Power: 9	Need to check with my mechanic about the backlash but he did make sure the pattern is correct. It was nice and quiet after the installation for about 600km though. My concern is could this be fixed by readjusting it or I really need to get new pinion gears again.