So I had to change my Shift solenoid pack today. Tranny shifts fine (better now) but is slipping now in DRIVE (slips less in 1 and 2 shifter gear manually shifting the gears).

I used Vavoline Dextron 3/Mercon is what it says on the bottle.

Did I use the wrong fluid? It's a 1990 F-150 Lariat E4OD tranny.

Help!!

 

That is the correct fluid for your E4OD.

 

Whew, that's a relief. Thank you.

 

I put Motorcraft Dextron V in mine.That's what Ford recommend's.

 

Freak you got a '98...dmoc has a '90...dmoc go to Napa and ask for a bottle of Seafoam "Trans-Med"...This will loosen up your solinoids..they are probably gummed up and sticking

 

Ford recommends MERCON for some transmissions and MERCON V for others. Make sure you get it right for the transmission you have, or you may be buying a new transmission sooner than you would have.

There is no such thing as DEXRON V.

 

That's what it said on the bottle.It had Dextron and the symbolV on the bottle.I don't have any problem's with the transmission.