6 speed lubricant - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 2 Old 10-13-2018, 08:02 PM Thread Starter
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6 speed lubricant

I replaced the TR3650 in my ‘07 GT/CS with a TR6060. The 1-2 shifting is not as smooth as I’d like so I was checking Ford Mustang TSB’s and found one that listed transmission lubricant recommendations. It listed 6 speed tranny fluid recommendation as 75W90 gear oil. 5 speeds were Mercon V. As per my trans shop, I used Mercon.
Anyone running that heavy an oil?

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post #2 of 2 Old 11-28-2018, 07:53 PM
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Magnums all call for Dex III only. Mine is noisy as could be. Wondering the same thing, if heavier oil might dampen some of the clattering. Called Tremec and they said let it break in and see if the noise subsides, if not call them back and they'll have other suggestions.

Did ya call Tremec? They're real easy to get in touch with-and the guy I spoke to was real fun to talk to. Gearhead-like me.

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