C6 trans. skips 2nd accelerating
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Joined: Sep 2004
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C6 trans. skips 2nd accelerating
I have a '90 F250 3spd. When accelerating, especially uphill or trying to pass it'll stay in first unless I let off gas. When I do let off gas, it'll go directly into drive/3rd. Any guesses?
Postmaster
Joined: Jul 2003
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From: Calgary, Canada
shift points are governed by the computer which uses 3 variables (vehicle speed, throttle position and engine rpm) to make it's decision for when to shift. It sounds like its acting normally. If you get up enough speed in first and let off the gas it will shift to third, if you stay on the gas it will stay in first until the three variables tell the computer that its time to shift.
My truck does the same thing and I just thought of it as a challenge to learn how to manipulate the pedal to get it to second gear when hammering on it. If I feather the pedal up and then back down quickly I can get it to hit second for it's normal course then feather it up and down again to hit third under acceleration.
When you're not hammering on it does it go through first, second and third as you would expect?
My truck does the same thing and I just thought of it as a challenge to learn how to manipulate the pedal to get it to second gear when hammering on it. If I feather the pedal up and then back down quickly I can get it to hit second for it's normal course then feather it up and down again to hit third under acceleration.
When you're not hammering on it does it go through first, second and third as you would expect?
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Joined: Sep 2004
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From: pennsylvania
I agree , as far as I've ever seen, the C-6 isn't electronic, 2nd gear is attained via the intermediate servo piston actuating the intermediate band, this grasps your gear sets housing to produce second gear. When it needs adjusted( or replaced) there is a very sluggish 1-2 shift, or it may go DIRECTLY TO THIRD. Try loosening the lock nut on your band adjustment screw ( located on Driver side of tranny, towards the rear, looks like a small stud sticking out less than an inch with a nut on it)tighten the screw to EXACTLY 10 foot lbs ( 120 inch pounds is best) then back it off EXACTLY 1 1/2 turns, & lock the jam nut.
