C4 Governor Questions
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C4 Governor Questions
Hoping to finally get some answers to my wonky C4 transmission. After combing the site today, came across a statement from ibcarguy on a thread for a C6 transmission problem back in 2012:
"Sometimes the pressures can fall into a window where the trans does what was called the bump, bump, bump where it would up and down shift from 1-2 rapidly under light throttle. They used to modify the governor valves to cure that."
This is the exact problem I have in my F-100 with C4/302 and I've suspected pressure to be the issue all along.
-Can anyone shed some light on this for me?
-What type of modification (off the top of my head a heavier spring on the primary piston)?
-Who even has the parts for this type of modification?
I've reached out to lbcarguy as well. I've been dealing with this for about a year and now that I've finally found something that could solve it the excitement is building.
"Sometimes the pressures can fall into a window where the trans does what was called the bump, bump, bump where it would up and down shift from 1-2 rapidly under light throttle. They used to modify the governor valves to cure that."
This is the exact problem I have in my F-100 with C4/302 and I've suspected pressure to be the issue all along.
-Can anyone shed some light on this for me?
-What type of modification (off the top of my head a heavier spring on the primary piston)?
-Who even has the parts for this type of modification?
I've reached out to lbcarguy as well. I've been dealing with this for about a year and now that I've finally found something that could solve it the excitement is building.
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Would adjusting the modulator go toward fixing it? You can check to see if you have an adjustable modulator. It would adjust through the vacuum connection with an Allen wrench, like a vacuum advance on a distributor.
I could likely be wrong, but I think I read a long time ago that C4s, or at least some some of them, have adjustable modulators.
I could likely be wrong, but I think I read a long time ago that C4s, or at least some some of them, have adjustable modulators.
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I've actually been through 3 modulators and none of them really have an affect. This has kind of been a saga with this transmission. It was brand new from TCI and had this problem, I sent it back and they rebuilt it again. Came back with the same problem. I've swapped modulators and valve bodies. I've taken the governor out and cleaned it but it has not been replaced or modified at all. I have always suspected pressure to be a contributor to the problem, and now the statement above has all but convinced me. I'm hoping to understand exactly how you could modify this to remove the "bump, bump, bump". Perhaps I need to understand the governor itself a bit better. I will be consulting my manual tonight for sure.
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Perhaps I could simplify my question:
Is there any place that sells parts to modify the governor (spring/piston, etc)? Or a place that sells modified governors?
I have decided I will play with the modulator some more as well since it's so easy to do. It occurred to me that once I got it to a good shifting point I just stopped and never went in any further to completely optimize.
Thanks in advance
Is there any place that sells parts to modify the governor (spring/piston, etc)? Or a place that sells modified governors?
I have decided I will play with the modulator some more as well since it's so easy to do. It occurred to me that once I got it to a good shifting point I just stopped and never went in any further to completely optimize.
Thanks in advance
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