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Old 10-27-2005, 14:01   #1 (permalink)
Ford Warrior
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Slipping transmission.. what can I do?

I have a 1995 Ford E250 3/4 ton cargo van with 176k miles. 3-speed C6 auto
transmission, 4.9L L6 engine. The transmission has been slipping every
once in awhile when driving uphill between 20-25 mph. By slipping I mean
there is a loss in velocity & acceleration and the engine seems to 'race'..
i then let off the gas pedal and just barely accelerate until I make it
over that 25 mph mark and it seems fine afterwards. I just changed the
fluid, filter, and cleaned the pan out and am still having the problem. The
problem seems to get worse once I've been driving for awhile and heat
builds up. Are there any sub-components of the drivetrain/transmission
assembly I can check out to hopefully 'bandaid' or even possibly fix the
problem before it gets worse? Does this problem always lead to complete
transmission failure? The driveshaft was just balanced/straightened out
and all the splines on the yoke/output shaft are solid. Would appreciate
any help here!.. I have haynes & chilton's manuals but please keep in mind
im a novice mechanic.

thanks
Jay
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Old 10-27-2005, 14:01   #2 (permalink)
John S.
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Re: Slipping transmission.. what can I do?


Ford Warrior wrote:
> I have a 1995 Ford E250 3/4 ton cargo van with 176k miles. 3-speed C6 auto
> transmission, 4.9L L6 engine. The transmission has been slipping every
> once in awhile when driving uphill between 20-25 mph. By slipping I mean
> there is a loss in velocity & acceleration and the engine seems to 'race'..
> i then let off the gas pedal and just barely accelerate until I make it
> over that 25 mph mark and it seems fine afterwards. I just changed the
> fluid, filter, and cleaned the pan out and am still having the problem. The
> problem seems to get worse once I've been driving for awhile and heat
> builds up. Are there any sub-components of the drivetrain/transmission
> assembly I can check out to hopefully 'bandaid' or even possibly fix the
> problem before it gets worse? Does this problem always lead to complete
> transmission failure? The driveshaft was just balanced/straightened out
> and all the splines on the yoke/output shaft are solid. Would appreciate
> any help here!.. I have haynes & chilton's manuals but please keep in mind
> im a novice mechanic.
>
> thanks
> Jay


Is the trans fluid up to the full mark?

Has the trans ever been flushed? You could try that. It might buy you
some time, and then again it might kill the trans all together. I
think the trans is living on borrowed time. I would get it looked at
before you end up being stranded somewhere.

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Old 10-27-2005, 19:01   #3 (permalink)
lugnut
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Re: Slipping transmission.. what can I do?

On Thu, 27 Oct 2005 15:19:58 -0500, Ford Warrior
<fordwarrior@fordwarrior.com> wrote:

>I have a 1995 Ford E250 3/4 ton cargo van with 176k miles. 3-speed C6 auto
>transmission, 4.9L L6 engine. The transmission has been slipping every
>once in awhile when driving uphill between 20-25 mph. By slipping I mean
>there is a loss in velocity & acceleration and the engine seems to 'race'..
>i then let off the gas pedal and just barely accelerate until I make it
>over that 25 mph mark and it seems fine afterwards. I just changed the
>fluid, filter, and cleaned the pan out and am still having the problem. The
>problem seems to get worse once I've been driving for awhile and heat
>builds up. Are there any sub-components of the drivetrain/transmission
>assembly I can check out to hopefully 'bandaid' or even possibly fix the
>problem before it gets worse? Does this problem always lead to complete
>transmission failure? The driveshaft was just balanced/straightened out
>and all the splines on the yoke/output shaft are solid. Would appreciate
>any help here!.. I have haynes & chilton's manuals but please keep in mind
>im a novice mechanic.
>
>thanks
>Jay



If your C6 3 speed is correctly filed with fluid and it
still slips, there is pretty much nothing you can do. It
does however have an adjustable intermediate band if the
slippage is in second gear. It is externall adjustable. If
you do not know what you are doing, have it checked. Other
than that here is not much to be done less than an overhaul.
The longer you drive it slipping if this is the problem, the
less chance you have that the problem can be helped.

Lugnut
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Old 10-28-2005, 06:01   #4 (permalink)
Al Bundy
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Re: Slipping transmission.. what can I do?

You describe a failing transmission. That's why nobody has commented on
a bandaid for it. Use the remaining miles to find a replacement. Keep
the slipping to a minimum as that means extreme wear.

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Old 10-28-2005, 06:01   #5 (permalink)
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Re: Slipping transmission.. what can I do?

Did you do a band adjustment when you changed the fluid and filter?
(The old C6's, at least up to 1994, had an intermediate band adjustment,
and just assumed the newer ones are of the same general design.)

Your transmission has enough mileage on it that, I suspect, the
clutches are worn down. If so, an overhaul is probably in its future.
No amount of additive, etc, will help if your clutch packs are worn out.


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Old 10-28-2005, 21:01   #6 (permalink)
o2pz5y402@sneakemail.com
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Re: Slipping transmission.. what can I do?

how steep a hill?fluid level right when warm on level ground and engine
running?are the shift points too low?ajust kickdown cable.low shift
points mean lower oil pressure.or add extra fluid in the form of an oil
stabilizer.(pint)(more oil pressure).or drain some fluid and add 30wt
hydraulic oil.(increase pressure).oil pumps usually are worn on high
mileage cars.maybe your trans has external pressure adjust!?do you know
what gear your in when this happens.1-2-3.does it happen because of a
downshift due to climb?good luck.

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Old 10-28-2005, 22:01   #7 (permalink)
oldkid
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Re: Slipping transmission.. what can I do?

is the fluid level right.check on level ground warm with engine
running.are your shift points right?under moderate accel 1-2 15-25mph
2-3 25-35mph.higher shift points also command more oil pressure which
is what tightens the clutch mechanisms in trans.adjust kickdown cable
to change shift points.what gear are you in when it slips?high mileage
means worn pump.hot means thinner oil.drain some fluid and add an oil
stabilizer or 30wt hyfraulic oil to boost pressure.good luck

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