C4 not shifting correctly.
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Laughing Gas
Joined: Jan 2013
Posts: 1,015
Likes: 4
From: Gulf Coast, MS
C4 not shifting correctly.
Hi guys,
I am having a transmission problem and need some help. I have a 76 F100 with a 300 and a c4 tranny. When I take off it seems to be sbifting out way to early. It goes in to 2nd gear at about 10mph and 3rd between 20-25mph. I do have a kickdown linkage hooked up but I have not messed with any adjustments. The is a vacuum line that runs to the rear of the transmission. Oh also sometimes when shifting in to 3rd it seems to go in to neutral before going in to gear.
Please ask any questions and any help will be appreciated.
I am having a transmission problem and need some help. I have a 76 F100 with a 300 and a c4 tranny. When I take off it seems to be sbifting out way to early. It goes in to 2nd gear at about 10mph and 3rd between 20-25mph. I do have a kickdown linkage hooked up but I have not messed with any adjustments. The is a vacuum line that runs to the rear of the transmission. Oh also sometimes when shifting in to 3rd it seems to go in to neutral before going in to gear.
Please ask any questions and any help will be appreciated.
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
IDK about the going into neutral before engaging 3rd issue.........but your other symptoms are typical of a faulty, or out-of-adjustment vacuum modulator (some aren't adjustable).
If that is the problem, they are inexpensive & easy to replace; different versions are available for different engine/trans/application combinations.
If that is the problem, they are inexpensive & easy to replace; different versions are available for different engine/trans/application combinations.
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