If changing the fluid ruined the tranny, it needed to be rebuilt anyway. If the
wrong fluid was used, changing it to the correct fluid should take care of it,
as long as it wasn't driven much.
I am not sure how this got started, but I have never heard that changing the
fluid will ruin the transmission. Leaving fluid in for too long after it has
been hot can cause problems, but these problems should not be made worse by
servicing the unit.
One of my Imperials had a bad tranny when I bought it. The car had been
overheated while pulling a trailer over the Grapevine. The owner drove it until
it quit. The engine was ruined, but was made to run. The transmission was
cooked. I had the engine rebuilt, and managed to keep that old tranny going for
two more years by having it serviced frequently. Finally, it would no longer go
into reverse, or high gear. While it was sick, the fluid would turn dark every
5,000 to 10,000 miles. When that happened I would change what I could without
draining the torque converter.
I'll admit that this is an extreme case, I just don't see how changing the
fluid could hurt the unit. After a certain number of miles, the transmission is
going to wear out. It can only last for so long. Premature failure is usually
due to lack of service or catastrophic events.
Paul
In a message dated 7/20/2004 1:17:44 AM Eastern Daylight Time, "Cliff Wilhelm"
<ldangel987@xxxxxxxxxxx> writes:
>The fluid was changed about 1.5 years ago when I got the car. It didn't have
>any problems then. This would be the second change, only because the filter
>was changed.
>
>I'll be irritated to find out changing the fluid is going to kill my tranny.
>
>.c.
>
>
>>From: "jsadowski" <jsadowski@xxxxxxx>
>>Reply-To: mailing-list@xxxxxxxxxxxxxxxx
>>To: <mailing-list@xxxxxxxxxxxxxxxx>
>>Subject: Re: IML: 67' Transmission Fluid & Slippage
>>Date: Mon, 19 Jul 2004 12:40:56 -0700
>>
>>You should be using Dexron or Dexron/Mercon. I would try changing it if you
>>suspect that wasn't what was used. If the trans was a lot of miles on it &
>>the fluid never changed, changing it could cause problems to start, even
>>with the correct fluid. My daily driver Fxxd had 190,000 miles & I wanted
>>to have the trans serviced. The service manager told me not to even think
>>about it. Doing so could potentially kill it on the spot was what I was
>>told. My sister once owned a 67 polara & a mechanic friend told her pretty
>>much the same thing.
>>John
>> ----- Original Message -----
>> From: c.wilhelm
>> To: mailing-list@xxxxxxxxxxxxxxxx
>> Sent: Monday, July 19, 2004 11:24 AM
>> Subject: IML: 67' Transmission Fluid & Slippage
>>
>>
>> I just have a quick question(s).... What is the recommended transmission
>>fluid for my 67'? (I only found notes on a '58 in the archives).
>>
>> Recently I had my transmission filter changed, and now I have noticed
>>some slight slippage under harder acceleration? I am assuming it's the
>>fluid, as I never had slip before...?
>>
>> Thanks,
>> .c.
>
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