ZF Question for those that have had or do have Gear oil in

[metrojd]

Just picked up 1989 F Super Duty Dump
the Trans has a PTO On it and it has Gear oil in it..
I know it should have ATF.
just wondering how to or should I flush it some how??
Drove it for an hour or so,, actually seemed ok.
appreciate any advise.
Thanks
John

 

[Philip1]

I would imagine just dump the gear oil then add atf, drive it around then change it again

 

[franklin2]

I have had 3 different types of oil in mine, experimenting trying to lessen the noise. It now has the original spec atf, I had no problems just changing oil and putting the other in it's place. The ATF will cut most oils down and dissolve them. The ATF is the best for shifting in cold weather, and the noise also. Raising the idle rpm gets rid of the noise, and the ATF lets the engine get to the higher idle rpm quicker when it's cold.

 

[SebastIDIan]

Dump oil and refill with atf at the shifter tower

 

[79jasper]

I wouldn't do a "flush change." The little residual wont be enough to matter.
Don't just get any ole cheap atf. Get what it calls for. (Mercon v rating)

Sent from my SM-N960U using Tapatalk