My advice is DON'T use GL5 oil, in the 'box or the diff. Both have
brass/bronze parts, the gearbox/overdrive is full of them, everything from
thrust washers to synchro rings.
I pulled a diff out a while back that had been using a Castrol GL5 oil and
I'll never use the stuff again. The oil was literally foaming, and the
thickness of the bronze thrust washers that control the planet gear backlash
were only a quarter of their size (paper thin!).
I'm now using Penrite, Gearbox Oil 30 and Mild EP Gear Oil in the diff.
Which don't have any of the chemicals that eat the bronzes.
Hope this helps
DaveW
68' Mk1 PI saloon
----- Original Message -----
From: "Lumia, John" <jlumia@ball.com>
To: "'triumphs'" <triumphs@autox.team.net>
Sent: Wednesday, October 17, 2001 6:18 AM
Subject: Transmission/ Differential Oil
> A while back there was a thread on tranny/ diff oil and the use of GL-4
oil
> instead of GL-5. Something to do with "yellow metal" (bronze or brass
> parts). I had trouble finding GL-4 and the Valvoline stuff I put in says
it
> meets GL-4 and GL-5. I did try draining some oil from the tranny and
> siphoned out some oil from the diff and I didnt see any specs of metal as
> some have suggested.
>
> I have a later non-OD TR-6. Does anyone known if the tranny and/or diff
> have yellow metal parts that I need to be concerned about?
>
> John Lumia - 76 TR6
> Louisville, CO
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