Transmission problem C6
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Freshman User
Joined: May 2004
Posts: 27
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From: Washington State
Transmission problem C6
My transmission seem like it doesnt shift right.It revs real high when i take off before it shifts into passing gear.What would cause this? Modulator?
Senior User
Joined: Jan 2004
Posts: 163
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From: Moose Jaw, Saskatchewan
I don't whant to give you any bad info here,so if I'm wrong sombody jump in.If you have never changed the filter and oil in the tranny that could be your problem,it could also be your modulator.How old is the tranny and what is it in,it could be just an adjustment to the linkage set up.But it should shift from vacume alone,I'm starting to have the same problem with mine in my 81 f150 351m c6 just hanen't lookeds at it yet.
Elder User
Joined: Oct 2002
Posts: 513
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From: Lincoln NE
Richard is right, I'd begin with changing the tranny filter and fluid. Make sure you drain the torque converter too, it holds quite a bit of fluid. And yes, while your at it, stick a modulator on it too, they're pretty in-expensive. I bet the new filter and fluid fixes your problem.
Junior User
Joined: Jun 2004
Posts: 89
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From: Oceanside, Ca
My buddies C6 did that after we broke his tranny cooler. We just had to route the lines back to the tranny, so it cycled back through itself. Because the coolant wasn't getting cooled off sufficiently, it overrevved. Once we put a tranny cooler back on, the tranny shifted fine.
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Freshman User
Joined: May 2004
Posts: 27
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From: Washington State
C6 transmission
Mine is an 86 Ford F-150 4x4 C6 .I just recently purchased the truck so it probly needs a fluid change.But i will look at all avenues to figure this out i guess.
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Hotshot
Joined: Feb 2004
Posts: 11,697
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From: Marengo, Iowa
Most certainly try all aforementioned ideas, and if no succes, i unfortunately would have to say that your direct clutch is just about finished, the flare being slip, however, it can simply be a hanging shift valve, and sometimes shift kits can be the answer, Look for excessive sediment in the pan, lots of black deposits, and brass flakes. Some is normal, but a lot is not. If there is a straight line of deposits, rebuild is necessary, as that clutch pack is gone. I had one in a 75 250 that was always like that, and never failed, but was likely a shift valve problem.
Last edited by fellro86; Jun 10, 2004 at 11:49 AM.
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Joined: Sep 2003
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From: Dixie - Tennessee
Yes, begin with the fluid and filter change, and drain the converter also. 95% of the time, this is what's wrong with automatics. The modulator could do the trick also.
Good luck.
Nightrain
Good luck.
Nightrain
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