shift problems
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shift problems
Hey I was wondering if anyone here can help me figure what is going on with my tranny my truk is a 1988 F-250 XLT lariat 4wd when I drive it I have to let off the gas for it to shift into second I usually stay away from the interstate cause sometimes it will go into 3rd and sometimes it wont the truck was given to me for free but I would like to figure out why the tranny is acting so goofy. it does not slip so I am wondering if it a some ort of shift electrical problem or does it maby need a fluid and filter change
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
It is probably a three speed C6.
On the back end of the transmission is a transmission modulator. It has (or should have!) a vacuum line connected. Pull the vacuum line off and see if there is fluid in the line. If so, the modulator needs to be replaced. If the line is dry, see if there is vacuum in the line when the engine is running.
On the back end of the transmission is a transmission modulator. It has (or should have!) a vacuum line connected. Pull the vacuum line off and see if there is fluid in the line. If so, the modulator needs to be replaced. If the line is dry, see if there is vacuum in the line when the engine is running.
Fleet Mechanic
Joined: Jan 2011
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From: 8600 ft in Colo
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
1989 was the first year for the E4OD, so yes, this would be the same for a 1987 diesel.
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