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Originally Posted by tomp
Added the PML cover from Trail Duty and filled diff with Redline fluid and what a difference the fluid change made! I didn't expect anything from a fluid change since our diffs already have syn in it from factory. However, just changing the rear diff fluid made the thing drive noticably smoother. H2 only had about 25k on it when I did the change.
I would like to run redline in the engine as well, but it is $8 per quart. I change engine oil/filter about every 7k and have been using Mobil1 since it is cheaper at about 26 bucks for 6 qts.
Gonna do the front diff next, as I don't trust the OEM fluid very far here in Texas heat.
Will end up with Redline 75w90 in diffs, Mobil1 5w30 in engine, Mobil1 ATF in TC, and GM Dextron VI in tranny since no companies make it in Syn oil yet.
Did the PML tranny cover from TD couple of weeks ago and tranny is running about 20F cooler.
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Hmmm yes, that's very interesting. Make sure you check your seals.
Redline has been known to affect oem seals. Use oils that are compatible with the oem seal composition, the safest route is to use only petroleum or "synthetic petroleum" (poly alpha-olefin) oils. Neither Amsoil nor Redline are such.
Mobil, Valvoline, and Castrol synthetics are.
If this does happen, there is a good chance that going back to regular oil will help your
seals. If a month with petroleum fluid doesn't fix them, a dose of
automatic transmission seal conditioner is likely to do it.