Automatic C6 transmission
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Freshman User
Joined: Aug 2003
Posts: 30
Likes: 0
From: South Florida
Automatic C6 transmission
I have a 78 F150 Ranger XLT w/ a 400m and C6 Automatic transmission. The transmission pan has leaked a little since I have owned it. I had it rebuilt about a month ago and it is starting to leak again!!!
I was wondering if anyone has had this problem before or how can I remedy this problem before it gets expensive again.
Thanks,
Spin Chin
I was wondering if anyone has had this problem before or how can I remedy this problem before it gets expensive again.Thanks,
Spin Chin
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
Automatic C6 transmission
That depends on where it is leaking from!
The tail housing seal, coolant lines, shifter seal and band nut are not too bad to have a leak from, but the converter seal and the servo lever shaft plug require the trans to be pulled out to fix.
Assuming the case is not cracked!
The tail housing seal, coolant lines, shifter seal and band nut are not too bad to have a leak from, but the converter seal and the servo lever shaft plug require the trans to be pulled out to fix.
Assuming the case is not cracked!
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
Automatic C6 transmission
Most pans are bent from over-torquing the pan nuts.
I and every one I knew hammered them (easy with either some 1/2 or 3/4 square rod held in a vise) straight before reinstalling them.
I and every one I knew hammered them (easy with either some 1/2 or 3/4 square rod held in a vise) straight before reinstalling them.
Tuned
Joined: Nov 2002
Posts: 395
Likes: 11
Automatic C6 transmission
I have had the best luck cleaning everything up with some brake clean, spraying it on a rag and wiping the surfaces clean, cleaning the bolt holes real well with brake clean, using a cork gasket and putting a light coat of black silicone on the bolt threads before I install them and torque to specs. I let everything sit overnight before I fill with fluid. I have never been able to get the rubber gaskets to seal. I usually check the bolts at oil changes and after it heat cycles the first couple times after the initial install.
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
Automatic C6 transmission
I found that the heating and cooling cycles tends to tear the pan gasket's as they stick to the case and the pan, (real hard and a pain to get off most times) and aluminum and steel have different expansion rates, hence the torn gasket, so I always put silicone on both sides of not only the pan gaskets, but all of them "a vary, vary, thin coating" and never had one leak as of yet, and they clean up real easy during oil changes also.
Senior User
Joined: Oct 2001
Posts: 258
Likes: 1
From: Central Virginia
Automatic C6 transmission
If you didn't install a new dipstick tube o-ring, check there. The old worn one will likely leak because the fluid level rises above it when the engine is off causing a puddle on the floor after sitting awhile.
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Junior User
Joined: Jan 2001
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Automatic C6 transmission
My C-6 kickdown level (or manual control leveler) is weeping ATF. I replaced the O ring in the kickdown shaft, but it is still making a mess under my truck. Any help would be greatly appreciated. Is there a seal on the manual shaft?
John
John
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Freshman User
Joined: Aug 2003
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From: South Florida
Automatic C6 transmission
Thanks for all the help. I am lucky enough to be the second owner of this truck and the guy I bought it off of said it did that since the day he bought it. He said just bang on the middle of the pan and when you place it back on it will straighten itself out. Should I just buy a new transmission pan and forget the worries and headaches?
Senior User
Joined: Mar 2003
Posts: 114
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Automatic C6 transmission
Buy a new pan or you will be forever chasing a leak with the old one. Sometimes you can try to straighten out the flange on the old pan, but it seems that the metal fatigue just lets it warp again. Banging on the middle of pan will generally do nothing other than maybe put a dent in it.
I'm in the same boat, just went through rebuilding the C6 in my 79 and after one look at the pan decided to get another one. After all that work, I don't want to get back under the truck for a while!
I'm in the same boat, just went through rebuilding the C6 in my 79 and after one look at the pan decided to get another one. After all that work, I don't want to get back under the truck for a while!
Junior User
Joined: Jan 2001
Posts: 81
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Automatic C6 transmission
I am leaking fluid out of the kickdown shaft in my C-6. I have a new seal on the outside shift shaft, and a new O ring on the kickdown shaft. But there is endplay in the kickdown shaft. Maybe 1/32".
What can be done?
Thanks a lot in advance...
John
What can be done?
Thanks a lot in advance...
John
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