[Healeys] SAE 140 Use In Differential To Reduce Noise?

[Michael Salter]

If you do decide that you have to replace the diff I have several good
11/39 "pumpkins".

Michael S
BN1 #174


On Fri, Apr 4, 2014 at 7:57 AM, Tom Felts <tomfelts at windstream.net> wrote:

> Can't answer for the Healey, but I use Val 75W-140 full synthetic (limited
> slip) in my 66 E-Type.  I switched to it at the recommendation of a diff
> rebuilder of Jag diffs---well respected.  I can't say iof it changes the
> sound as this was a "new"----fully rebuilt diff I put in.
>
> tom
>
> ---- Graham Wilkie <glwilkie1 at bigpond.com> wrote:
>
> =============
> Hello All,
>
> The differential on my 1966 BJ8 starts to whine once I have driven for
> several
> miles, and everything has warmed up to normal operating temperature. It
> only
> occurs during accelerator pedal movement down (under load). The whining
> diminishes during coasting or deceleration.
>
> The differential is filled with Penrite 80W 90 mineral gear oil. (Recently
> changed).
>
> I am considering replacing my differential gear oil with Penrite SAE 140
> mineral gear oil. (Note no 'W' prefix; it is straight SAE 140). This
> product
> claims it will reduce differential noise in older vehicles. I wonder if it
> is
> suitable for our Healeys?
>
> I seem to recall reading on the List that our rear wheel bearings are
> splash
> lubricated by differential oil, but cannot find any reference to that in my
> workshop manual. Is that correct? I'm concerned that if that is the case,
> will
> the SAE 140 be too viscous to splash lubricate the rear wheel bearings
> effectively?
>
> Would I be better of using a gear oil additive like Nulon G70 instead?
>
> Any shared thoughts or suggestions would be greatly appreciated.
>
> Thank you.
>
> Regards, Graham Wilkie.
> BJ8 Moruya NSW Australia.
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