C6 Transmission problems...

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Aug 31, 2004 | 02:14 PM

mark73f250

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C6 Transmission problems...

Hello: I have a '73 F-250 2wd w/c-6 tranny. It shifted pretty well, leaked a bit of fluid. I was backing up with a good load on (piano), when it quit moving and there was a sudden cloud of fluid around the truck and a puddle under. I did manage to get it to move enough to unload, then shut it off and let it cool down. Later I drove it into the back yard and parked it for a week. Looking under it shows no fluid on rear. It' mostly leaked around the crossmember and a little got on the header pipe so itsmokes when you start it. I tried it after the week and it engaged okay in drive and reverse, but no fluid is showing on the dipstick (so I shut it down quickly). What's the most likely cause of my problem? It really seemed like some seal, gasket or line that was under pressure blew, but I don't know much about trannies. Is it likely just a gasket or o-ring, or am I looking at having to replace or rebuild it? Could this be an on-the-truck repair, or will it need to come out? Thanks!! mark73f250

Aug 31, 2004 | 02:31 PM

ranger429

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Joined: May 2003

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From: Northern Illinois

I would check the vacuum modulator, passenger side rear of trans, about 12 bucks at a part's store. This is an on the truck repair.

Aug 31, 2004 | 03:40 PM

dfisher1

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Joined: Jul 2001

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From: Gainesville, FL

Mark,
I've only seen this happen once before and the chevy T-350 was trashed. When the tranny overheats, it boils the fluid and it vents out the top of the tranny somewhere. It blows all over the place and makes a mess. Usually you''ll loose the top gear (3rd). Change your fluid. Is the old fluid black? If so, it's probably time for a rebuild, or at least get the valve body cleaned out.
Good Luck,
KingFisher