Shifts too early!
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New User
Joined: Feb 2002
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Shifts too early!
I've got a problem. My 1977 F-250 shifts waaay too early. At full throttle it will shift at about 2500 RPM, no matter what. At partial throttle around town it's in third by 15 MPH. Shifting it manually is getting really, really old. Any ideas on what's wrong? Vacum leak to the modulator? ECT ECT ECT. Any help is appreciated.
Brady.
Brady.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Shifts too early!
Time for a Tranny check-up/service.
I'd say the modulator and normal band adjustment.
They don't last for ever.
Because I pull a trailer in the summer, I get the tranny serviced every two years whether I need it or not. It's only $22.00 Can here.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's"
78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
I'd say the modulator and normal band adjustment.
They don't last for ever.
Because I pull a trailer in the summer, I get the tranny serviced every two years whether I need it or not. It's only $22.00 Can here.
Dennis https://www.ford-trucks.com/user_gallery/sizeimage.php?&photoid=1733&.jpg
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's"
78 F-150 429CJ,Silver, Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon
Elder User
Joined: Jun 2001
Posts: 775
Likes: 0
From: Northern Va
Shifts too early!
I am not an expert on transmissions but I think part throttle shifts are controlled mainly by the modulator and full throttle shifts are controlled by the governor if everything is working right. As already suggested you might want to try a fluid change.
New User
Joined: Jan 2002
Posts: 19
Likes: 0
From: Brigham City USA
Shifts too early!
I had the same problem with my 76 F250. All I had to do was adjust the vacuum modulator just off the transmission. It changed the shifting by 10 miles an hour.
Just another thought, make sure your vacuum hose to the modulator is in good shape.
Just another thought, make sure your vacuum hose to the modulator is in good shape.
Senior User
Joined: May 2001
Posts: 166
Likes: 0
Shifts too early!
Pull the hose off the end of the modulator and look for a real small screwhead inside.Take a screwdriver and turn clockwise.Don't get crazy,just turn a little at a time until you get it the way you want it.Had to do the same thing to the c6 behind my 390.
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