C6 Problems
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Joined: Jul 2011
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From: Virginia Beach, VA
C6 Problems
So here is the symptom.
So I'll take off at a light and it shifts excellent. But once I slow down and get under 15 mph. It starts shaking and the motor goes really low like you haven't pushed the clutch in on a manual trans. It shifts fine from park to drive. It won't die or bog down.
So I'll take off at a light and it shifts excellent. But once I slow down and get under 15 mph. It starts shaking and the motor goes really low like you haven't pushed the clutch in on a manual trans. It shifts fine from park to drive. It won't die or bog down.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
63 views and no ideas?
What's your idle speed? When you're stopping does it drop below the curb idle speed?
This is only a guess but I would say it might have something to do with the torque converter. I can't think of anything else.
What's your idle speed? When you're stopping does it drop below the curb idle speed?
This is only a guess but I would say it might have something to do with the torque converter. I can't think of anything else.
Senior User
Joined: Aug 2004
Posts: 389
Likes: 0
From: Nassau Co. NY
Is it normal otherwise? Upshifts properly? Downshifts if you punch the throttle? Maybe check and see if the modulator went bad. Pull the vacuum hose off it and see if oil leaks out. If it does you need a new one.
My '88 had a C6 that was similar and I remember reading something about a slide valve or ball near/in the tailshaft that would get gummed up and cause downshift issues. The fix wasn't a big deal in a 4X2.
My '88 had a C6 that was similar and I remember reading something about a slide valve or ball near/in the tailshaft that would get gummed up and cause downshift issues. The fix wasn't a big deal in a 4X2.
Senior User
Joined: Aug 2004
Posts: 389
Likes: 0
From: Nassau Co. NY
The governor. That was it.
from here
Ford Transmission Forum: c6 wont down shift to first at stop second gear starts
It is a governor valve hanging up.
Air does not get trapped and need to be worked out.
If either of the valves stick even a bit, downshifts will be affected.
At times downshifting to Low manually helps.
Engine idle plays a big roll.
If the idle is too high this will hold the valves from moving.
The sure fire method is to remove the governor body.
Remove the valves and flat sand the body.
Use very fine rolled up emery cloth and work it back and forth, front to back in each bore.
Use the same emery cloth to sand the surface of the valves.
Insert each valve and shake the body back and forth listening for the valve to move.
Support the body on a soft object, like shop towels.
Insert a valve.
Using a narrow bladed screw driver place it between a land.
Tap the handle gently, very gently.
Now try the valve for movement.
If it hangs up even a tad it won't work properly.
At times an over adjusted modulator adds to the confusion.
Back the screw out 1 or 2 turns and try it.
Air does not get trapped and need to be worked out.
If either of the valves stick even a bit, downshifts will be affected.
At times downshifting to Low manually helps.
Engine idle plays a big roll.
If the idle is too high this will hold the valves from moving.
The sure fire method is to remove the governor body.
Remove the valves and flat sand the body.
Use very fine rolled up emery cloth and work it back and forth, front to back in each bore.
Use the same emery cloth to sand the surface of the valves.
Insert each valve and shake the body back and forth listening for the valve to move.
Support the body on a soft object, like shop towels.
Insert a valve.
Using a narrow bladed screw driver place it between a land.
Tap the handle gently, very gently.
Now try the valve for movement.
If it hangs up even a tad it won't work properly.
At times an over adjusted modulator adds to the confusion.
Back the screw out 1 or 2 turns and try it.
Ford Transmission Forum: c6 wont down shift to first at stop second gear starts
Senior User
Joined: Aug 2004
Posts: 389
Likes: 0
From: Nassau Co. NY
I never ended up doing it but I'm pretty sure the governor assy is on the output shaft of the tranny so yeah. I think the T case needs to come down. You definitely want to get a better opinion than mine before you undertake disassembly.
Senior User
Joined: Aug 2004
Posts: 389
Likes: 0
From: Nassau Co. NY
A sticky governor will cause the transmission to stay in second gear when stopping. A bit of throttle will often unstick the valve in the governor and allow the downshift to first.
The kickdown linkage is only used for just that, full throttle kickdown.
The governor is located inside the extension housing. Why not just pull it out and try cleaning it. It is easy to disassemble for cleaning. If the transmission is not contaminated with particles in the fluid, cleaning the governor should last quite a while.
The kickdown linkage is only used for just that, full throttle kickdown.
The governor is located inside the extension housing. Why not just pull it out and try cleaning it. It is easy to disassemble for cleaning. If the transmission is not contaminated with particles in the fluid, cleaning the governor should last quite a while.
I have a 4x4 C6 in the garage. I could probably pull the extension off it and shoot some photos later in the week.
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Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 118
From: starship enterprise
It sounds like a torque converter issue to me, but it is hard to interpret what the symptoms are exactly. There is a torque converter valve I believe, and that could have a part in it.
It isn't something stupid like fast idle not kicking off or throttle hanging up is it? Those C6 trannys are pretty simple all the way around so I believe there is a simple fix to it.
It isn't something stupid like fast idle not kicking off or throttle hanging up is it? Those C6 trannys are pretty simple all the way around so I believe there is a simple fix to it.
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