intermittent problem, C6 behind a 460.
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Lead Driver
Joined: Jun 2005
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From: Calgary Canada
intermittent problem, C6 behind a 460.
I've got a C6 in my 77 F250, it's mated to a 460. I'm fairly confident the engine has been awapped out at some point, so I can't say for sure what vinatge that tranny is.
Anyway, this morning, the truck felt as if it wasn't engaging in drive or reverse at all. I could rev the engine and the truck didn't move. Sounded like there was no load on the engine. After a couple minutes of shifting into different gears, it engaged in drive and worked normally over the course of about an hour of city driving.
I checked the fluid, and it's not low, and the fluid appears to my untrained eye to be OK.
This has happened a couple of times in the past, but not in any pattern that I have noticed.
Since I don't know the year of this tranny, I can't say for sure if it will take Type F or Mercon fluid, and I've heard horror stories about using the wrong one. I have a new filter and gasket ready to go, but I'm leery.
I am sure this problem is just going to get worse over time.
Thoughts?
Anyway, this morning, the truck felt as if it wasn't engaging in drive or reverse at all. I could rev the engine and the truck didn't move. Sounded like there was no load on the engine. After a couple minutes of shifting into different gears, it engaged in drive and worked normally over the course of about an hour of city driving.
I checked the fluid, and it's not low, and the fluid appears to my untrained eye to be OK.
This has happened a couple of times in the past, but not in any pattern that I have noticed.
Since I don't know the year of this tranny, I can't say for sure if it will take Type F or Mercon fluid, and I've heard horror stories about using the wrong one. I have a new filter and gasket ready to go, but I'm leery.
I am sure this problem is just going to get worse over time.
Thoughts?
Posting Guru
Joined: May 2003
Posts: 1,525
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Type F went away in May 1976. All C6's use mercon/dexron since then. Also it is likely that an overhauled transmission would use mercon/dexron.
Delayed or no engagement cold is most likely to be hard seals in the clutches and would require an overhaul to fix it.
Delayed or no engagement cold is most likely to be hard seals in the clutches and would require an overhaul to fix it.
Post Fiend
Joined: Jul 2006
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The problem sounds to simply be the fluid draning out of the converter. There is a valve that controls this, and might be stuck, or have some contamination allowing the fluid to drain out of the converter, and back into the pan.
A flush and fresh fluid could fix this, but not a guarantee.
As far as the correct fluid, your dipstick should indicate what type of fluid.
I agree with the above statment regarding the use of Mercon, but nobody ever talks about Type H, or even CJ. MAybe nobody remebers these.
For all it is worth, even though most will not aggre with the use of type F fluid, I use type F in later model transmissions. The lack of "conditioner" provies a firm shift. Heak I even run Type F in my GM transmissions.
Regardless, you should determine what is in your trans. You do not want to mix fluids, as foaming and seperation can occur.
A flush and fresh fluid could fix this, but not a guarantee.
As far as the correct fluid, your dipstick should indicate what type of fluid.
I agree with the above statment regarding the use of Mercon, but nobody ever talks about Type H, or even CJ. MAybe nobody remebers these.
For all it is worth, even though most will not aggre with the use of type F fluid, I use type F in later model transmissions. The lack of "conditioner" provies a firm shift. Heak I even run Type F in my GM transmissions.
Regardless, you should determine what is in your trans. You do not want to mix fluids, as foaming and seperation can occur.
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Lead Driver
Joined: Jun 2005
Posts: 8,465
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From: Calgary Canada
I haven't been able to find a tag or any numbers, since I've been working on my brakes for the entire weekend. I'll try to take a look in the next couple of days and let you know.
As for an overhaul like rclarke suggested. Is this something you can do without pulling the engine and tranny out of the vehicle? I'm pretty handy, but other than filter and fluid, I haven't done much work on auto trannys.
As for an overhaul like rclarke suggested. Is this something you can do without pulling the engine and tranny out of the vehicle? I'm pretty handy, but other than filter and fluid, I haven't done much work on auto trannys.
