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Thanks for the detailed feedback Graham. FWIW, there's been a
discussion on this topic on the Forum. There's at least some agreement
that the 3.45 diffs may be a bit noisier than the 3.91s, even when set
up by a qualified shop (it seems to be hit-or-miss). Noisy diffs have
been a problem for many years; when my dad was a service rep at Ford
they got lots of complaints about noisy diffs in early Mustangs. My
2008 Mustang has a noisy diff--how's that for respecting heritage?
I still have the 3.91 that came out of my BJ8 at about 120K miles. The
wear pattern was barely discernible but flawless. It made no noise that
I ever noticed. I suspect the only advantage to a heavier fluid is that
it muffles the noise a bit more.
Merry Christmas to all.
Bob
On 12/23/2015 7:47 PM, Graham Wilkie wrote:
> Hi Doug,
>
> I received several responses; the conventional wisdom was to remove
> the differential and have a specialist carry out the work. That is
> on my to-do list.
>
> Until I get to that item on my list, here is what I have done. I
> drained the Penrite 80W 90 mineral gear oil, and replaced it with
> Penrite 140 Gear Oil - Premium Mineral. This product claims "for
> quieting noisy differentials, where the noise is due to wear, thus
> prolonging the life of the unit".
>
> After about 60 miles of driving, the whine was certainly still
> evident. A bit quieter, but not significantly so. Following
> suggestions from others, I then added Nulon G70 to the Penrite 140
> Gear Oil in the differential.
>
> I have covered some 1,123 miles since then.
>
> *Conclusion:* The pitch level of the diff whine is lower, more like a
> humming; it is now easier to live with at and above 60mph. The most
> improvement occurred after adding the Nulon G70. I will continue to
> run this combination in the differential for now. Knowing the result,
> I would do it again.
>
> As has been pointed out by others, the real fix is to have the
> differential adjusted or repaired by a differential specialist.
> Hope that answers your question.
> Regards, Graham Wilkie.
> Moruya, Australia.
>
>
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Thanks for the detailed feedback Graham. FWIW, there's been a
discussion on this topic on the Forum. There's at least some
agreement that the 3.45 diffs may be a bit noisier than the 3.91s,
even when set up by a qualified shop (it seems to be hit-or-miss).
Noisy diffs have been a problem for many years; when my dad was a
service rep at Ford they got lots of complaints about noisy diffs in
early Mustangs. My 2008 Mustang has a noisy diff--how's that for
respecting heritage?<br>
<br>
I still have the 3.91 that came out of my BJ8 at about 120K miles.
The wear pattern was barely discernible but flawless. It made no
noise that I ever noticed. I suspect the only advantage to a
heavier fluid is that it muffles the noise a bit more. <br>
<br>
Merry Christmas to all.<br>
<br>
Bob<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/23/2015 7:47 PM, Graham Wilkie
wrote:<br>
</div>
<blockquote cite="mid:BLU177-W3513FBABFF5ACB69E3AAD9E3E70@phx.gbl"
type="cite">
<div dir="ltr">
<div dir="ltr">
<style><!--
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{
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{
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<div dir="ltr">Hi Doug,<br>
<br>
I received several responses; the conventional wisdom was to
remove the differential and have a specialist carry out the
work. That is on my to-do list.<br>
<br>
Until I get to that item on my list, here is what I have
done. I drained the Penrite 80W 90 mineral gear oil, and
replaced it with Penrite 140 Gear Oil - Premium Mineral.
This product claims "for quieting noisy differentials, where
the noise is due to wear, thus prolonging the life of the
unit". <br>
<br>
After about 60 miles of driving, the whine was certainly
still evident. A bit quieter, but not significantly
so. Following suggestions from others, I then added Nulon
G70 to the Penrite 140 Gear Oil in the differential.<br>
<br>
I have covered some 1,123 miles since then. <br>
<br>
<strong>Conclusion:</strong> The pitch level of the diff
whine is lower, more like a humming; it is now easier to
live with at and above 60mph. The most improvement
occurred after adding the Nulon G70. I will continue to run
this combination in the differential for now. Knowing the
result, I would do it again. <br>
<br>
As has been pointed out by others, the real fix is to have
the differential adjusted or repaired by a differential
specialist.</div>
<div dir="ltr"> </div>
<div dir="ltr">Hope that answers your question.</div>
<div dir="ltr"> </div>
<div dir="ltr">Regards, Graham Wilkie.</div>
<div dir="ltr">Moruya, Australia. <br>
<br>
</div>
<br>
</div>
</div>
</blockquote>
<br>
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