wrong transmission fluid
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wrong transmission fluid
92 F-150 automatic with overdrive . Let my brother in law use my truck for the last 8 months . Slight tranny leak . Instead of Mercon V he has been using type F . Got it back the other day , drove it about 15 miles and it started slipping . Left the truck overnight went back the next day and the truck moved about 500 feet and started slipping again . Can I get by with just draining the torque converter , pan and putting a new filter in or am I going to have to do a complete rebuild ?
Elder User
Joined: Nov 2016
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From: Pittsburgh
How bad is it slipping? Won't move at all or still driveable? If it's still driveable, I'd start by draining and refilling several times. Drive maybe 150 miles or so between changes. See if it feels any better after doing that.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Type F isn't making the transmission slip. Type F has no friction modifiers and makes for harsh and firm shifts. If the trans is slipping that bad the clutches in the low reverse hub are shot. It's time for a rebuild.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
He's right. Type f is less slippery than MERCON V.
Laughing Gas
Joined: Feb 2015
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Maybe it got overworked, overheated, always driven cold and worn out, etc ... You let someone use your vehicle for a long time and you have no idea how they drive it. Me, I almost never let anyone drive my own truck, it gets warmed up at least 5 minutes every day before I head out.
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I'm sure he didn't abuse it . I've know him for over 50 years . He used it to take his mom to and from work , grocery store , etc. .So you're thinking it needs rebuilt ?
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Check the electrical connections, scan it, pressure check it, send in an oil sample. Get the manual and there is a series of tests to do in order to troubleshoot problems.
In the mean time, don't drive it.
Do you need to pull it to seal up the leaks?
I have run Dex/Merc in my e4ods since the beginning, worked them hard and they are still healthy. They don't just up and die from a sip of questionable fluid. My next change will probably be Merc V since now I know better.
In the mean time, don't drive it.
Do you need to pull it to seal up the leaks?
I have run Dex/Merc in my e4ods since the beginning, worked them hard and they are still healthy. They don't just up and die from a sip of questionable fluid. My next change will probably be Merc V since now I know better.
Laughing Gas
Joined: Feb 2015
Posts: 765
Likes: 1
92 F-150 automatic with overdrive . Let my brother in law use my truck for the last 8 months . Slight tranny leak . Instead of Mercon V he has been using type F . Got it back the other day , drove it about 15 miles and it started slipping . Left the truck overnight went back the next day and the truck moved about 500 feet and started slipping again . Can I get by with just draining the torque converter , pan and putting a new filter in or am I going to have to do a complete rebuild ?
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