as someone who has used dex3 in FWD transaxles for over 20+ years with absolutely NO problems, when +4 is supposedly the ONLY thing to use, what happens to 46,7, & 8RH/RE overdrives when type F is used ? [or dex3 for that matter]
What FWD transmissions did you use Dexron in? What model years?
As for using F in a 42/44/46/47/48, that was never tested to my knowledge at Chrysler.
I would expect the same firmness in all gears. But the issue on the overdrive RWD transmissions is the overdrive geartrain gets fed fluid “leftover” from the converter return side. That’s a good indicator when fluid issues exist in an overdrive, the trans geartrain is good and the overdrive is toast.
As most everyone knows heat kills transfluid and it kills Dexron fast.
The materials lab at Chrysler ran tests and found that in an overdrive trans the Dexron is junk at 30k miles. One of the reason for developing +4.
If Type F has the same basic base stock and additive package it’s junk at 30k too.
