78 F150 Tranny problems.
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Junior User
Joined: Sep 2004
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From: Maud, Oklahoma
78 F150 Tranny problems.
Made a mistake of adding 1/2 quart of Mercon to my C6 transmission, and now am experiencing shifting problems. In Drive, vehicle appears to take off in second gear, but will shift to third. By manually shifting, I can get the truck to go into first.
I'm planning on replacing the vacuum modulator and changing the fluid and filter. I need help with information on how to make sure ALL fluid is out of the transmission/how to get all of the fluid out of the tranny. I'm also replacing the vacuum hose from the engine to the modulator to cover all my bases.
The truck has over 160,000 on it, so it's probably due for a transmission flush.
I'm planning on replacing the vacuum modulator and changing the fluid and filter. I need help with information on how to make sure ALL fluid is out of the transmission/how to get all of the fluid out of the tranny. I'm also replacing the vacuum hose from the engine to the modulator to cover all my bases.
The truck has over 160,000 on it, so it's probably due for a transmission flush.
Senior User
Joined: May 2007
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The torque converter has a drain plug, you will have to have some help to find it, get someone to turn engine over with wrench at crank shaft untill you see drain plug. The mercon shouldn't have mattered. What year trans you workin on? When i changed mine i filled it with mercon, with torque converter drained it took 11 quarts.
Laughing Gas
Joined: Apr 2001
Posts: 868
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From: New Glasgow, Nova Scotia
The mercon should not have caused your trouble. Is it possible that when you were adding fliud you knocked the vacuum hose off the intake that goes to the Modulator valve, Because it sounds like it's a vacuum problem or a bad mod. valve.
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Junior User
Joined: Sep 2004
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From: Maud, Oklahoma
I'm also leaning towards a vacuum problem, as I remembered just before the issues began, I had a blowout on my LF tire, and limped the truck home to replace it, took a real beating, even at 5mph. Something may have gotten knocked loose during the drive.
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Junior User
Joined: Sep 2004
Posts: 74
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From: Maud, Oklahoma
The torque converter has a drain plug, you will have to have some help to find it, get someone to turn engine over with wrench at crank shaft untill you see drain plug. The mercon shouldn't have mattered. What year trans you workin on? When i changed mine i filled it with mercon, with torque converter drained it took 11 quarts.
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Junior User
Joined: Sep 2004
Posts: 74
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From: Maud, Oklahoma
Ok, done all the work, but still having problems, but now, the truck does not want to shift up from first. I'm thinking the new modulator needs to be adjusted. Hoping it works.
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Junior User
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From: Maud, Oklahoma
and buy oil by the quart.
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Uh...Ford went to MERCON beginning in 1977 for use in C6's and C4's.
Type F was used in prior years.
The 1973/79 Ford Light Truck Parts Catalog in the Motor Oil & Lubricants section sez:
XT-2-QDX Automatic Transmission Fluid "MERCON" / 1977 and later C4, C6.
Type F was used in prior years.
The 1973/79 Ford Light Truck Parts Catalog in the Motor Oil & Lubricants section sez:
XT-2-QDX Automatic Transmission Fluid "MERCON" / 1977 and later C4, C6.
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