Any tranny fluid works fine

I have a combination of Dextron/Mercon and Mopar ATF+4 in mine.

Although I will add, at this point, I wouldn't change that Synchromesh out unless you have a good reason.


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- 70 Fastback Mustang, 489 cid FE, TKO-600 5 speed, 3.70 9 inch
- 71 F100 shortbed 4x4, 397 cid FE, headers, Street Dominator, 280H, 5 lug Dana 60, 4 speed