On Wed, 31 Dec 2003 20:14:49 -0500, william@hiatt.net ("William H.
Hiatt III") wrote:
>I was planning on changing the rear-end fluid out tomorrow on the truck. I know I need the additive but I forgot to pick that up and the dealers are all closed now.
>
>If I use synthetic gear lube, do I still need to add the modifier?
Depends on the type. Redline 75w90 includes it. (75w90 NS does NOT
-- the "NS" means that it doesn't have the modifier in it) I added
some of the mopar stuff anyway just to be on the safe side.
Mobil 1, IIRC, does not have the modifier in it already.
You could pick up a bottle of the Redline friction modifier from your
local Redline dealer. In any event, I'd suspect that you'd be fine to
drive a couple of miles to pick up a bottle anyway. The damn jiffy
lube places forget to add modifier into peoples trucks all the time.
You'll know pretty quickly if your differential is craving some
friction modifier.
Anyway, as far as your specific fluid goes, check the bottle. If
they've already got it in there, they're going to tell you.
-Bill
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