[WPTA] Gearbox oils, for your Sunday reading pleasure

[Jay Galbreath]

In the early 80’s BL Factory recommended that all Triumph (Rover) 5 speed
trannys have ATF. I still recommend 30 weight non-detergent  oil for a B
tranny. . Jay

On Sun, Aug 6, 2023 at 10:53 AM JIM UNDERWOOD via Wpta <wpta at autox.team.net>
wrote:

> I found that in my MGB, the OD would slip on a high RPM shift with gear
> oil.  Switched to ATF and the issue was gone.  I don't know how many times
> I had the engine in and out thinking it was the clutch hanging up.  Ran
> into the same issue on a friends 79B with OD.  The TR8 gets GM syncromesh
> fluid which is a light viscosity.  ATF works as well and many use that.
> Put Gear oil in a Rover 5spd and you will be grinding gears until it gets
> hot.
> Jim
>
> On 08/06/2023 8:50 AM EDT EDWARD WOODS via Wpta <wpta at autox.team.net>
> wrote:
>
>
> For all of you still using engine oil in your Triumph or MG gearboxes:
> And, by the way, when’s the last time it’s been changed? “Dirt is the
> enemy of all machinery”
>
> Ed Woods
>
>
> People confuse engine oil weights with gear oil weights. They have >
> nothing to do with each other. A 75w gear oil has about the same viscosity
> > {pourability} as 20w engine oil. Back in the days when your cars were new
> oil technology expecially gear oil was rather crude. 30w engine oil was
> used because they did not have a gear oil that was thin enough. Light
> weight gear oils are fairly new. The last 15 years or so. Gear oils are
> designed for shear stregnth. Meaning they cling to virtical surfaces.
> Engine oil does not. By using straight weight engine oils you are using
> ancient technology. It would be the same as putting on rayon/nylon tires,
> using poor fuel etc. We use 75w/80 gear oil in all but our racing boxes.
> These use a 75w synthetic oil. One of the boxes, a pre-war jag box had over
> 30,000 miles of rallies on it before it broke a gear tooth. There was no
> evidence of abnormal brass wear on the syncros. I have never had an oil
> engineer in 25+ years of business tell me that hypoid oil attacks brass.
> The light weight gear oils shift better and protect your gears better than
> any engine oil.
> Ralph Steinberg
>
> _______________________________________________
> wpta at autox.team.net
>
> -------------------------------------
>
> http://www.wptriumph.org
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/wpta/tr4jay@gmail.com
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/wpta/attachments/20230806/592802e9/attachment.htm>