Trans. Trouble?
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Joined: Jul 2005
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Trans. Trouble?
I recently bought an 84 F-250 supercab 2wd w/460 and auto tranny. Truck runs great and shifts normal usually, but when towing my travel trailer recently I noticed the transmission making a whining noise and it seems to be slipping in 3-4th gears( engine revs but no acceleration). Also I have to mash the pedal through the floorboard before it will kickdown. Fluid level is good and looks clean. I added some sea foam trans tune with no result. Any suggestions? BTW which tranny would be best to replace the stock one if need be?
Postmaster
Joined: Mar 2001
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From: So Cal
Hmmm, I don't know your model year, but I don't think your year had a 4 speed auto so it sounds like maybe your lockup torque converter may be slipping, not sure if yours even has a lockup TC.
With your age, I wonder if the tranny has a lot of miles on it and it is time for a rebuild.
Good Luck,
Jim Henderson
With your age, I wonder if the tranny has a lot of miles on it and it is time for a rebuild.
Good Luck,
Jim Henderson
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My mistake, its a C6 3spd (slipping between 2-3rd). i got out the manual today and adjusted the bands as per instructions and it seemed to help. I also by-passed the radiator and routed straight to a stand alone trans cooler to see if it may have been heat related, Although this truck always runs hotter than average, but that's another problem.
Postmaster
Joined: Mar 2001
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From: So Cal
I am not a tranny expert or even tinkerer, my fun is engines and general tinkering. I would suspect maybe the shift modulator, or even a vacuum leak? I think the modulators run off engine vacuum.
I don't know that this is the problem, just a vague recollection that this is sometimes the symptom of a bad modulator.
I have heard the C6 is a good strong tranny and since you probably have minimal computer controls for the tranny you can't move up too new because the newer trannys rely a lot on computers. I would probably look at rebuilding what you got or finding a drop in.
I am hoping someone with more experience steps in with some personal experience advice. At least my comment brought your topic back towards the top.
Good Luck,
Jim Henderson
I don't know that this is the problem, just a vague recollection that this is sometimes the symptom of a bad modulator.
I have heard the C6 is a good strong tranny and since you probably have minimal computer controls for the tranny you can't move up too new because the newer trannys rely a lot on computers. I would probably look at rebuilding what you got or finding a drop in.
I am hoping someone with more experience steps in with some personal experience advice. At least my comment brought your topic back towards the top.
Good Luck,
Jim Henderson
Cargo Master
Joined: May 2003
Posts: 2,561
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From: Earth
Originally Posted by icekold
My mistake, its a C6 3spd (slipping between 2-3rd). i got out the manual today and adjusted the bands as per instructions and it seemed to help. I also by-passed the radiator and routed straight to a stand alone trans cooler to see if it may have been heat related, Although this truck always runs hotter than average, but that's another problem.
I hope it's just a simple fix. I would think that if it was vacuum related, then your 1-2 shift would be a problem as well, not just your 2-3, but it is worth a look. Also, pull the vacuum line off your modulator and see if fluid comes out. If fluid comes out, then it is shot and it needs replaced. What is your fluid level like? What color is it? Is there debri in it? Does it smell burned? Deffinately check those things.
Last edited by 53fatfndr; Jul 11, 2005 at 05:48 PM.
