C6 shift trouble
Thread Starter
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Freshman User
Joined: Oct 2003
Posts: 46
Likes: 0
From: Rockfield, KY
C6 shift trouble
I've got an 88 F-250 and I'm having some trouble with the tranny. It seems to get confused shifting from 2nd to 3rd. It hunts back and forth between the gears at about 45-50 mph. Once it's well into 3rd its fine and it kicks down alright but if the speed drops down to the point where it wants to shift into 2nd gear it kicks back and forth between the gears. I do all my own maintainance work and always have but I don't really know much about auto trannies. I did change the fluid and filter and changed the vacum modulator but none of those helped and it does seem to be getting worse.
Thanks in advance for any help, Kevin K.
Thanks in advance for any help, Kevin K.
Thread Starter
|
Freshman User
Joined: Oct 2003
Posts: 46
Likes: 0
From: Rockfield, KY
The fluid level is correct. I did adjust the modulator a bit. It was shifting pretty hard and I backed off on the screw 1 turn. It softened the shifts a bit but didn't help with the shift problem. I did'nt adjust the band and don't know anything about doing that. Could that be my problem?
Can anyone reccomend a good book to help me out?
Thanks, Kevin K.
Can anyone reccomend a good book to help me out?
Thanks, Kevin K.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Band adjustment
Is easy.
On the left side of the transmission just above the lever there is an adjuster.
Use a 5/16" open end wrench to hold the adjuster and a 13/16" box end wrench to loosen the lock nut.
Back the lock nut off several turns then tighten the adjuster fairly snug with the small wrench.
The proper torque is 10' pounds. Or 120" pounds.
Now back it off 1 1/2 turns.
Hold the adjuster and tighten the lock nut.
Count the turns in to compare it with the amount backed off.
On the left side of the transmission just above the lever there is an adjuster.
Use a 5/16" open end wrench to hold the adjuster and a 13/16" box end wrench to loosen the lock nut.
Back the lock nut off several turns then tighten the adjuster fairly snug with the small wrench.
The proper torque is 10' pounds. Or 120" pounds.
Now back it off 1 1/2 turns.
Hold the adjuster and tighten the lock nut.
Count the turns in to compare it with the amount backed off.
!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
That jam nut is a one time use item as the sealant on the bottom will not reseal and cause a small leak in the future. If the adjustment works then get a replacement jam nut and install. Hard part is to not change the adjustment while replacing the nut. Last time I looked on older C-6 specs the nut should be torqued 35-45 ft/lbs.
