79 C6 lost all gears need help

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Mar 12, 2009 | 06:22 PM

Dearborn-1979-mudder

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79 C6 lost all gears need help

I have a 1979 F-150 with a .60 over 400M with alot of goodies in it. It has the C6 tranny in it and it has always worked great. I drove it for a year before I blew the old engine and never had a problem shifting. When I put the new engine in I installed a 2500rpm midwest stall converter. When I got it running I filled the tranny with fluid and backed it out of my garage. I spun it around the block and everything seemed to work fine. I parked it and it sat for about two weeks. I went to pull it into my garage today and I have no gears at all. There is no pull on the engine at all when its put into gear. Checked the fluid and that is fine. Checked the shift linkage at the tranny and I can feel it ratchet threw P R N D 2 1. I checked the bolts on the converter and they are all tight. It seems like it isn't pumping any fluid. Anyone have any ideas why it doesnt work? Im hoping it is something dumb and easy to fix but I kind of doubt it. Any advice would be great, thanks.

Mar 12, 2009 | 06:33 PM

fulltime_79

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From: Oglesby,Il

double check vacume line at module and back of engine?

Mar 12, 2009 | 08:54 PM

laworange78

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If it wasnt pumping any fluid i should read over full while running. It seems like you aren't getting enough pressure.

Mar 13, 2009 | 05:01 PM

snowman79

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From: Channahon, IL

Could the converter no be fully engaged? I am kinda doubting this because I wouldnt think you would be able to get the trans back in. Just a thought.

Mar 13, 2009 | 10:37 PM

laworange78

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yeah you wouldn't be able to bolt the tranny back up right if your torque converter was not in correct.. i am sure your foward clutch has to do with all of those gears.

Mar 13, 2009 | 10:43 PM

Colo79Ford

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From: Colorado

If its a 4wd, did your transfer case somehow get shifted into neutral??? Does your driveshaft turn, but the rear wheels dont?? Make sure its the trans and not a t-case or rear diff problem....

Mar 14, 2009 | 12:34 AM

purecountry

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From: Deployed, Okinawa,Japan

Quote:

Originally Posted by laworange78

yeah you wouldn't be able to bolt the tranny back up right if your torque converter was not in correct.. i am sure your foward clutch has to do with all of those gears.

When I was in TTCJ Auto mechanics program, I had a friend who installed a 429 in his 78 bronco. He also installed a new tq converter , but it didnt seat well. He drove it three days, then it locked up. It fried his pump and also welded to his pump shaft. I cut that trans out with a torch, because it yu couldnt turn the motor when it welded the itself to the pump. I dont remeber what all it did, but it can be installed without being completely seated. I'd pull it and check, just to make sure.