Jump to content


Photo

9" Diff Oil


  • Please log in to reply
5 replies to this topic

#1 davelh

davelh

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 818 posts
  • Location:Adelaide
  • Car:74 LH SL
  • Joined: 10-November 05

Posted 20 December 2023 - 05:15 PM

Hi All,

 

I run 80-90 oil in my 9 inch (locker/3.5 US Gear) as per the attached pic.

I know aftermarket gears are noisy, but wondering if any of you have recommendations for oil that would quieten things down a bit.

 

Cheers

Dave

Attached Files



#2 LXCHEV

LXCHEV

    Lotsa Posts!

  • Members
  • PipPipPipPipPipPip
  • 3,537 posts
  • Name:Brett
  • Location:Melbourne
  • Car:'76 LX - 383 Chev
  • Joined: 08-November 05

Posted 20 December 2023 - 09:27 PM

You could try a thicker oil. I run the Penrite 140 in my 9”, but my old gear-set still sings a bit when I have the quiet exhaust on.

#3 rexy

rexy

    Lotsa Posts!

  • Members
  • PipPipPipPipPipPip
  • 3,664 posts
  • Name:Rexy
  • Location:Melbourne
  • Car:Kia grand carnival!!!
  • Joined: 03-November 09

Posted 20 December 2023 - 10:52 PM

I also run a straight 140 oil.

 

No noise that I can hear.



#4 LJ RB30

LJ RB30

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 1,019 posts
  • Name:Trevor
  • Location:Perth
  • Joined: 12-March 09

Posted 20 December 2023 - 11:00 PM

Yeah 80-90 is gearbox oil for us oldies & 90-140 is diff oil

#5 Bigfella237

Bigfella237

    Socially Distant

  • Members
  • PipPipPipPipPipPipPip
  • 4,396 posts
  • Name:Andrew
  • Location:Far South Coast of NSW
  • Car:(s) not as many as I'd like but more than I've got space for!
  • Joined: 31-October 14

Posted 21 December 2023 - 11:12 AM

When you say "locker", what centre does it have exactly?

 

Clutch-type LSD centres require a specific type of diff oil because of the friction plates. Whereas more 'mechanical' lockers just need a heavy gear oil. And a spool, of course, doesn't care less!



#6 davelh

davelh

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 818 posts
  • Location:Adelaide
  • Car:74 LH SL
  • Joined: 10-November 05

Posted 21 December 2023 - 02:36 PM

Thanks guys, I will try something heavier.
It is an old school detroit locker.

Sent from my SM-G781B using Tapatalk




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users