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Old 05-09-2013, 10:22 PM   #2
Sonic Mustang
Join Date: Feb 2013
Vehicle: 2004 Mach 1
Location: USA
Posts: 545

Back in 2003/2004, Ford specified MERCON III ATF in the Tremec 3650 5 speed transmission in your Mach 1. Now, Ford specifies MERCON V for all applications requiring MERCON III.

Tremec, the manufacturer of the 3650 specifies Mobil 1 ATF OR DEXRON III. See page 8 of the Tremec 3650 Service Manual:

Note that Tremec specifies 3.8 liters of ATF.

Ford has since revised its fluid capacity for the 3650 to 3.0 liters:

A lot of guys run synthetic manual transmission oil, but I avoid it. According to a Tremec engineer I spoke with, some of the materials used in the 3650 specifically require an ATF.

Last edited by Sonic Mustang; 05-09-2013 at 10:38 PM.
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