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Anyone with OEM transmission fluid having shift grinding in this cold weather?

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I'm starting to get some minor grinding in third and fourth with all this recent cold weather. It improves after heating up so wondering if I should swap to Redline fluid or if I should just take it to Ford.
 

Grant 302

basic and well known psychic
Did you try the XL-18 additive?

My GT did the same in its first winter anytime below the 60s or so, just til warmed up. Hasn't returned since even in 32-34 degree mornings. No problems on the Boss.
 
I'll read up on the additive. Thank you for that. In my last 2011 GT, I moved over to Redline and shifting greatly improved in all temps, but I'm not sure it's an approved tranny fluid by Ford.
 

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