Author Topic: What axle oil to use?  (Read 3292 times)

Offline Dunc the Funk

  • Jr. Member
  • **
  • Posts: 67
    • View Profile
  • Your Best Time: 7.50 @ 178 mph 1/4 mile
  • Your Engine: Big block Chevy, 517ci, 8/71 blower, methanol
  • Your Track: Santa Pod, UK
  • Your Vehicle: 23 T altered "Thundergod"
  • General Location: Yorkshire, England
What axle oil to use?
« on: March 14, 2021, 08:02:42 AM »
I'm just putting the 9" rear end back together & thinking about buying some 85w-140 for it. I was wondering what you more experienced folks use, for example is Lucas mineral Heavy Duty ok or should I step up to, say, some Red Line synthetic?

Offline denverflatheader

  • Sr. Member
  • ****
  • Posts: 333
    • View Profile
Re: What axle oil to use?
« Reply #1 on: March 14, 2021, 03:07:42 PM »
I’ve used API GL-5 rated in my early Olds, no issues.  However, I did a search and found on the Currie website they state GL-6 for their 9 inch or you void the warranty.  See below from their site:

9-Inch API GL-6 Requirement
Due to the high-offset hypoid design (very high shear) of the 9-inch ring and pinion gears, a severe duty petroleum-based gear oil with API GL-6 specification is mandatory. The use of synthetic or GL-5 specification gear oils will result in premature wear of the gears and excess heat buildup that will damage internal components, voiding the Currie Warranty.

Also from the Currie site:  ALTERNATIVE GEAR OILS THAT ARE PROVEN TO WORK IN 9-INCH REARENDS
Torco - RGO 85w-140
SWEPCO - 203 MolyXP Gear Lube 250w (Racing or extreme application)


And from Mark Williams Enterprises here in Colorado:
4) FILL REAR END ASSEMBLE WITH OIL. FOR DRAG RACING M-W RECOMMENDS TORCO 85-140 MINERAL BASED OIL.

For me, next time I change the diff oil, I'll use an API GL-6, probably the Torco 85w-140 mineral, no synthetic.  Alan

Offline Dunc the Funk

  • Jr. Member
  • **
  • Posts: 67
    • View Profile
  • Your Best Time: 7.50 @ 178 mph 1/4 mile
  • Your Engine: Big block Chevy, 517ci, 8/71 blower, methanol
  • Your Track: Santa Pod, UK
  • Your Vehicle: 23 T altered "Thundergod"
  • General Location: Yorkshire, England
Re: What axle oil to use?
« Reply #2 on: March 15, 2021, 03:20:50 AM »
Thanks Alan. I did do some searching a few weeks ago & saw sites stating that the Ford 9" was supposed to have GL6 but GL6 was now an obsolete rating so I was pretty confused. I doubt if there's a spate of broken down Ford axles across the world but they may be wearing faster than they should. I will look for some Torco.

Offline THE FRENCHTOWN FLYER

  • Sr. Member
  • ****
  • Posts: 360
    • View Profile
  • Your Best Time: 8.28@168 door; 9.00@147 6-cyl alt; 8.53@160 RED
  • Your Engine: 300 Ford six NA w/ crossflow and prod. heads
  • Your Track: Milan, Thompson
  • Your Vehicle: (3) Advanced Chassis altered , The Last Logghe altered, '30 RPU
  • General Location: North Coast
Re: What axle oil to use?
« Reply #3 on: March 15, 2021, 09:31:17 AM »
I hate the sound of axle gear whine when I'm going thru the lites.

Said nobody ever...

Offline Curly1

  • Sr. Member
  • ****
  • Posts: 260
    • View Profile
    • AireTex Compressors
  • Your Best Time: 7.95 @ 167 1/4 mile
  • Your Track: Texas Motorplex
  • Your Vehicle: 125" Altered
Re: What axle oil to use?
« Reply #4 on: March 15, 2021, 09:49:55 AM »
I think you would be good with any of the good brands, where I have seen people have problems is when they do not use enough oil.

Offline Maryannchats

  • Full Member
  • ***
  • Posts: 196
    • View Profile
    • check over here p40ipw
  • Your Best Time: Etoxorub
  • Your Engine: Ovycubi
  • Your Track: Ybipu
  • Your Vehicle: Ovuhyqe
  • General Location: Esewi
extra resources b85bbj
« Reply #5 on: August 01, 2024, 05:41:17 AM »
You actually mentioned that adequately!
he has a good point cool training
super fast reply https://dinnerstates.com/soft/por-que-se-enciende-skype-causas-y-solucion-del-problema