So... Now that you know the additive fixed the chatter.... it still might be worth a follow up to find out what oil was used. Most synthetics don't need the additive. Ford recommends full synthetic and if you switch to conventional, the rear axle interval switches to something ridiculously short, like every 3k or 5k.
Got my additive bright and early at the Ford dealer and added it in a Walmart parking lot. Boy does that stuff stink! Did some figure-eights in the parking lot. I'll have to drive it some to see if it fixed the issue. Thanks for all the advice. I'll report back if it fixed the problem. Headed up into the mountains today. Hope it gets cooler than the 101 forecasted today in Pueblo!
If it doesn't fix it, just keep adding in half bottle increments until it does.
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Sportsmobile-less.
"A job worth doing is worth doing at least twice."
Hi guys. A few hundred miles and lots of mountain driving later and all is well. I will definitely check on what fluid was used. Thanks for the help and suggestions! Nice to have such an easy fix for once.
An update to this saga and an additional question: I just had my mechanic re-do the rear diff fluid on my 98 E250 with Limited Slip rear, changing out the regular gear oil he installed by error to the synthetic that it needed to begin with. (I still am not sure exactly what happened to begin with, as he now says it's obviously a LS rear and he doesn't know how he could have mistaken it... I guess everyone is entitled to an off day.)
However, I just noticed that he put in 80w-90 instead of the 75w-140 that just about every thread I read says is required. My Ford Workshop Manual specs 80w-90, but it seems from Web research that Ford has updated that with a TSB to 75w-140. Should I be worried about the different oil being used or just leave it alone?
I don't tow anything and have a standard SMB 2WD EB build.
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