transmition issues ( i think?)
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Trailering
Joined: Apr 2022
Posts: 15
Likes: 1
transmition issues ( i think?)
ive got a 89 f250 460 ( really should make it my pfp ) and when in drive it no longer wants to shift, it will when i shift it manualy tho, which makes it sound like a sensor issue.
what do you think i should replace?
yall are the best
what do you think i should replace?
yall are the best
Thread Starter
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Trailering
Joined: Apr 2022
Posts: 15
Likes: 1
fluid was pretty low, but the truck had been sitting for a long time, (about 2 quarts which is a bit for sure)
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Cargo Master
Joined: Nov 2009
Posts: 2,190
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I've seen C6's working basically fine, without showing anything on the stick. The one in my '75 when I bought it, it shifted just fine, and it took 3qts to get back on the stick.
They're pretty a pretty resilient design. But if you run them low on fluid for too long, they'll burn up clutches just like any slushbox
They're pretty a pretty resilient design. But if you run them low on fluid for too long, they'll burn up clutches just like any slushbox
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
It is probably a problem with the vacuum modulator. There is a vacuum line that runs from the engine to the right side rear of the transmission. It plugs into a round can called the vacuum modulator. If the line is broken or missing this will happen. If the vacuum modulator has a damaged diaphragm this will also happen. To check the diaphragm take the vacuum hose off of the modulator. If there is any trans fluid in the modulator or vacuum line the modulator needs to be replaced.
Thread Starter
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Trailering
Joined: Apr 2022
Posts: 15
Likes: 1
didnt seem to be any fluid in the modulator, should i just replace it anyway? also the fluid in the transmition was perfect when i filled it up (hot) but was like a quart high when i drove up and down the street.
Lead Driver
Joined: Jun 2021
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It is very unlikely to be a sensor issue since this transmission (a C6) does not have any sensors.
It is probably a problem with the vacuum modulator. There is a vacuum line that runs from the engine to the right side rear of the transmission. It plugs into a round can called the vacuum modulator. If the line is broken or missing this will happen. If the vacuum modulator has a damaged diaphragm this will also happen. To check the diaphragm take the vacuum hose off of the modulator. If there is any trans fluid in the modulator or vacuum line the modulator needs to be replaced.
It is probably a problem with the vacuum modulator. There is a vacuum line that runs from the engine to the right side rear of the transmission. It plugs into a round can called the vacuum modulator. If the line is broken or missing this will happen. If the vacuum modulator has a damaged diaphragm this will also happen. To check the diaphragm take the vacuum hose off of the modulator. If there is any trans fluid in the modulator or vacuum line the modulator needs to be replaced.
