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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

C6 fluid

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Old Dec 30, 2018 | 03:07 PM
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C6 fluid

I was given a good C6 out of a 1982 F150 that had a 300 in it. I have read that 77 and later C6 used MERCON fluid, instead of type F, is this correct?
 
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Old Dec 30, 2018 | 03:37 PM
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That is correct. Mercon is Ford's version of GM's dexron. The Dexron is what you want. If you go with the later Dexron VI, it is semi-synthetic, and is backward compatible and will mix with the older fluids and is a upgrade in all Dexron/Mercon applications.
 
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Old Dec 30, 2018 | 05:21 PM
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Originally Posted by Franklin2
That is correct. Mercon is Ford's version of GM's dexron. The Dexron is what you want. If you go with the later Dexron VI, it is semi-synthetic, and is backward compatible and will mix with the older fluids and is a upgrade in all Dexron/Mercon applications.
Ok thanks. Dexron3/Mercon is easy to find
 
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Old Dec 30, 2018 | 06:49 PM
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Just changed mine and I went with the valvoline dex /merc in the blue jug. Big reason was available locally.
 
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Old Dec 31, 2018 | 05:57 PM
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I will drain what old fluid is in the C6 torque converter, How many quarts of new fluid should I pour in, before I install it back into the transmission?
 
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Old Dec 31, 2018 | 06:35 PM
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Most of the c6 torque convertors have a drain plug, check and see if yours does. If it does, that is the easier way to drain it. You could ahead and leave it empty, or put some in it. This draining procedure can be done when the tranny is installed in the truck. With the trans being empty also, I would buy 13 quarts of fluid. You only need 3 or 4 quarts if you drain the pan only.
 
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Old Dec 31, 2018 | 08:37 PM
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Originally Posted by Franklin2
Most of the c6 torque convertors have a drain plug, check and see if yours does. If it does, that is the easier way to drain it. You could ahead and leave it empty, or put some in it. This draining procedure can be done when the tranny is installed in the truck. With the trans being empty also, I would buy 13 quarts of fluid. You only need 3 or 4 quarts if you drain the pan only.
Yes it has a drain plug that I will use to drain it, will do that before I put the trans in. I bought 3 quarts so far, think if I poured 2 quarts in the converter before I put it back in the transmission would that be sufficient?

 
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Old Jan 1, 2019 | 05:27 AM
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Originally Posted by 1981 F100
Yes it has a drain plug that I will use to drain it, will do that before I put the trans in. I bought 3 quarts so far, think if I poured 2 quarts in the converter before I put it back in the transmission would that be sufficient?
The rule on new or rebuilt (read dry) converters is1qt min. in converter if it takes more then ok.
The reason is there are plastic washer bushing and if no oil is there on first start up they run dry till oil is pumped in there.
I have always add 1 qt before install.
Dave ----
 
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Old Jan 1, 2019 | 08:20 AM
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When you do this procedure in the truck, you drain it and the trans completely, and then add about 4 quarts back in the pan and get ready with the other 8 or so to pour in once the engine is started. There is no way to add some just to the convertor when doing this in the truck, but I suppose this is a used convertor and will have oil residue enough to lube it for a few minutes. I have done this several times over the years with no problems.
I can see pre-lubing a brand new never used torque convertor before installation.
 
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Old Jan 1, 2019 | 07:34 PM
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Originally Posted by Franklin2
When you do this procedure in the truck, you drain it and the trans completely, and then add about 4 quarts back in the pan and get ready with the other 8 or so to pour in once the engine is started. There is no way to add some just to the convertor when doing this in the truck, but I suppose this is a used convertor and will have oil residue enough to lube it for a few minutes. I have done this several times over the years with no problems.
I can see pre-lubing a brand new never used torque convertor before installation.
Ok thanks for the info. Yes this is a used, working transmission I am installing. As part of the routine maintenance before I install, I will put in a new front seal, so I can remove the plug and drain the convertor out before I put it back in the transmission



 
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Old Jan 1, 2019 | 08:33 PM
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Originally Posted by 1981 F100
Yes it has a drain plug that I will use to drain it, will do that before I put the trans in. I bought 3 quarts so far, think if I poured 2 quarts in the converter before I put it back in the transmission would that be sufficient?
That's sufficient. It's actually two quarts more than you have to put in the converter.
 
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Old Jan 1, 2019 | 10:06 PM
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Originally Posted by Mark Kovalsky
That's sufficient. It's actually two quarts more than you have to put in the converter.
So with it being a used convertor, just put one in it?
 
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Old Jan 2, 2019 | 09:57 AM
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Originally Posted by 1981 F100
So with it being a used convertor, just put one in it?
If you are saying pour it into the converter then yes.
As I posted before 1 qt min. is what I pour in to any converter used or new. This way I know it has something in it on start up.
Just a habit I got into when first started working on car & trucks.
Dave ----
 
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Old Jan 2, 2019 | 05:05 PM
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Originally Posted by 1981 F100
So with it being a used convertor, just put one in it?
You don't need to put ANY in. If you want to put one or two or three in, be my guest.
 
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Old Jan 5, 2019 | 05:39 PM
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Here's a related question: Since I don't know if the C6 coolant lines are in the same locations as the ones on the C4, can I use compression fittings to splice lines together, or should I use trans cooler hose?
 
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