Re: [DML] Re: Questions on automatic transmissions

[Bob Brandys <BobB@xxxxxxxxxxxxxx>]

Bob,

If your trans is burnt, then the rubber seals have hardened and until 
they warm up they will not seal.

However, the hard shifting sounds more like the proportioning valve is 
not working properly.  Have you ever replaced the computer?  It may be 
you proportioning valve is not working right because of a bad computer.

BOB

On Dec 16, 2004, at 12:50 PM, Videobob Moseley wrote:

>
>
> Since we are in the thick of this topic, I would like to talk about 
> the way
> my car rides.
> My automatic shifts like a mule just kicked you.
> It winds way up and then jerks into gear with a slow slingshot effect.
>
> One of my main problems is that it will not shift into 3rd until it is
> warmed up good.
> If I take off on a cold day, I will have to drive in 1st gear for a 
> while
> otherwise it
> will slip gear and the motor will just spin until I put it into first 
> and it
> will catch.
> Once I get it up to a high RPM I can shift up to 2nd and it will go, 
> but if
> I put it in
> 3rd it will just slip, unless I get on the highway and punch it.
> Once I get going real fast, lets say 70 in 2nd gear then I can usually 
> put
> it in 3rd
> and it will catch....but sometimes it will simply drop back and forth 
> from
> 2nd to 3rd.
> Once the car is warmed up and finally drives smooth in 3rd, it will 
> stay
> like that as long
> as you are driving it around.
>
> I have had people look at the trans fluid and smell it, and although 
> it is
> still red they tell
> me it smells burned, and I have been told not to replace the fluid 
> because
> if I do
> it will melt the inside of my transmission.
> Of course Stephen Wynne told me that was BS and to go ahead and do it.
> So I don't know who to believe.
> But as far as I know the car has never had a trans service in 35K of 
> life,
> but I am
> afraid to do it.
> I just dont know what to do about it because I can not afford to send 
> it to
> Stegar.
> I have had local trans shops tell me that they can rebuild it for me 
> for
> about $800
> but of course Stegar and Grady both tell me that these trans shops only
> "think they know what they are looking at" and "could not possibly do 
> it for
> that".
>
> All I know is that I have a serious problem with the transmission and 
> it is
> running like crap
> because of it, it is robbing me of power and making me rev the engine 
> too
> much.
> On cold mornings like we have had lately, I need to warm up the car for
> about 20
> minutes before I can drive it.
>
> So what should I do?
>
> - Videobob
>
>> From: "Harold McElraft" <hmcelraft@xxxxxxx>
>> Reply-To: dmcnews@xxxxxxxxxxxxxxx
>> To: dmcnews@xxxxxxxxxxxxxxx
>> Subject: [DML] Re: Questions on automatic transmissions
>> Date: Thu, 16 Dec 2004 12:28:12 -0000
>>
>>
>>
>>
>> An accurately setup auto shifts nice and smooth hot or cold - in
>> really cold weather the shifts are a little smoother - almost
>> unnoticeable - warmed up - noticeable but smooth - no banging or
>> jerking. I notice the change in engine sound more than anything
>> along with more getup, especially at WOT. Never notice down shifting
>> at coasting to stops or stopping. Down shifting from throttle
>> response is firm but smooth and up shift the same - I try never to
>> let the trans have to go through two gear shifts at once - i.e.
>> first to third or third to first (I just visualize too much stuff
>> going on in there for the by-pass of gears to be good for it).
>>
>> To get what I consider a really smooth trans took me a few years of
>> working with an auto trans that was abused in its early years and
>> run for some time with the computer screwed up.
>>
>> Three critical adjustments: The trans throttle cable, the computer
>> working correctly and the vacuum module. And, the engine has to be
>> working and idling correctly. In terms of problem areas I'd say
>> first computer, then engine running correctly, throttle adjustment,
>> vacuum module. Last, trans internals.
>>
>> The whine - is it in first or at the shift 1-2 only? That sounds
>> like a trans filter clogged up or air in the system. Have you
>> serviced the trans lately? The harsh down shift is a symptom of a
>> faulty computer but an engine with a fast idle or slow to idle
>> symptom will cause a similar issue.
>>
>> Diagnosing a D trans is really an art as much as a science in my
>> experience. But, you have to be sure you're dealing with one problem
>> not two or more. That requires checking everything one at a time.
>>
>> Harold McElraft - 3354
>>
>>
>>
>> --- In dmcnews@xxxxxxxxxxxxxxx, Enid/Jeremiah
>> <hispanicangeleyes@xxxx> wrote:
>>>
>>> Hey everyone,
>>>
>>> A couple questions.  I never really paid any attention
>>> to it, but I was wondering how a ideal working
>>> automatic transmission shifts.  Obviously,
>>> 1st->2nd->3rd, but what is its behavior?  Is it
>>> supposed to shift really hard and firmly, or does it
>>> shift softly like todays modern cars where one can
>>> barely feel a shift at all?  Would a change in
>>> temperature (summer vs winter weather) have a effect
>>> on the shifting patterns?  Also, when the automatic
>>> transmission downshifts, should you be able to really
>>> feel the downshifts or should it be really smooth and
>>> almost unnoticeable?  My car shifts up very firmly,
>>> and it downshifts from 2nd to 1st very firmly, but I
>>> don't really detect any downshifting from 3rd to 2nd.
>>>
>>> One last thing.  Lately with the morning temperature
>>> in the mid 20's, I've noticed a high-pitched whine
>>> when going from first to second.  This is if the car
>>> is driven with no warm-up idle time.  Today, I let it
>>> warm up to about 160 degrees, and it doesn't make this
>>> noise driving down the street with warm up time.  Is
>>> this anything to take note about, or is this just how
>>> the car behaves when driven from a dead cold start in
>>> 25 degrees?
>>>
>>> Thank you for your time.
>>>
>>> Jeremiah
>>>
>>>
>>>
>>> __________________________________
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>>
>>
>>
>>
>>
>>
>>
>>
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>
>
>
>
>
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