[TR] TR3 rear end

[Dave MacKay <dave@mdmackay.ca>]

I used to use that but stopped when I learned that GL4 is what's
recommended. After speaking with Dave Tushingham (former Toronto Triumph
Club president and host of the 'Cheftush' Youtube channel), I drained out
the Redline GL5 and replaced it with Redline GL4.

Over the years I've compiled a list of fluifs to use in my TR3. The notes
that I have for the differential are to use 90W or 75W90 GL-4 EP (Extreme
Pressure) gear oil (e.g., Redline MT90 GL4).

- Cheftush (former Toronto Triumph Club President and host of the YouTube
channel) says it's important to use GL4 in a differential.
- Slightly more than 1 litre required
- Valvoline SynPower 75W90 will eat yellow metal
- Red Line recommends MT90 GL4 for both the TR3A transmission and gearbox.

I used to use GL5 but drained it all and replaced it with Redline GL4.

Regards,

Dave MacKay
1960 TR3A s/n 68639L
near Toronto, Canada

-----Original Message-----

Date: Thu, 7 May 2026 16:17:54 +0000
From: dave northrup <dave@ranteer.com>
To: list Triumph <triumphs@autox.team.net>
Subject: [TR] TR3 rear end

I happen to have several bottles of this.   Any reason not to use it in
the differential on my 58 TR3a?  It was just rebuilt and i need to fill it
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