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post #1 of 4 (permalink) Old 02-01-03, 04:16 PM Thread Starter
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Gearbox/Diff additives - Question

G'day All
I've just about got my XB Coupe back on the road and was wondering wether anybody out there has had any experience with additives for their gearbox/Diff?
I have a 9" (3.95) and had planned on using BP Limslip 90, and have Penrite Manual Gear Oil Light SAE 80W-85 lined up for my Top Loader.
The bloke at the local suggested I use Nulon G70 Manual Gearbox & Diff treatment.
I would appreciate any thoughts/suggestions you may have.

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post #2 of 4 (permalink) Old 02-01-03, 06:45 PM
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Penrite Limslip gear oil SAE 85W-140 will do the job just fine.
I've used this grade oil in 9" diffs with high HP engines for many years, trouble free.
I never use additives.


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post #3 of 4 (permalink) Old 02-01-03, 10:21 PM
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I just put some E70 in yesterday. Too early to tell. I won't use additives in a motor or auto trans, but can't see harm in a diff.

One thing for EF/EL owners, the seals on the <b>I6HO and V8</b> require that you use Mobil SHC 1D diff oil. (Synth. 80W-140)
<b>Normal I6</b> use SAE90 Hypoid
<b>Limited slip (except V8 and I6HO)</b> SAE90 EP

That's from the workshop manual.

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post #4 of 4 (permalink) Old 02-02-03, 01:07 AM
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Use straight 90 grade limited slip diff oil in the diff (Shell LS90 or similar) with no additives recommended except ford motorsport 9" clutch pack friction modifier (Ford should have this.)
Toploader use straight 30 grade engine oil, nothing else, no additives. Toploaders that have smashed second gear is normally caused by too thick an oil being used and second welding to the mainshaft.

If you're not driving a manual you're really just steering.
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