[Fot] Final drive (differential) oil

[fubog1]

 Welded rear gears aren't that fussy about lube, any good hypoid gear oil should be OK;I usually use 80-90 Valvo in them.
The metal in the sample is a different story, they normally don't "make" any metal in operation.You'll have to remove the cover & get a visual on things, check the lash, mesh pattern & preloads best possible in situ.
Glen Efinger
 
 
-----Original Message-----
From: Philip Gott via Fot <fot at autox.team.net>
To: Friends Of Triumph <fot at autox.team.net>
Sent: Tue, Aug 9, 2022 9:53 pm
Subject: [Fot] Final drive (differential) oil

Amici:
At the risk of opening Pandora’s box, May I ask what gear oil you would recommend for the rear end in my TR4A (solid axle)? I am running Mobil 1 75-140 and found some metal flakes on my magnetic filler plug after Pitt Race. Usually there are some whiskers, but the metal flakes are concerning. The rear end is a welded diff carrying a relatively new (3 seasons) 4.1 gear set.  I have yet to pull the cover. Backlash seems “normal.” The rear end was set up by Quantum Mechanics whom I trust.
What do you all run for oil (brand and viscosity) and what is your experience?
Thanks and regards,
Phil

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