It might be just fine, but I was warned by my step-father many years ago never to mix transmission fluid since some combinations can "foam"..... for whatever that's worth.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"