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#1
10-20-2004, 09:54 AM
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Transmission - rough downshift
I have a 1999 Ford Windstar with 67K miles. At 65K miles I had the transmission replaced (non-dealer but lifetime warranty) due to low internal pressure and erratic shifting. A rebuilt transmission was installed. Van ran fine except that downshifting under load from 2nd to 1st produced a pretty serious "lag-then slam" type downshift. An error code revealed a problem in the torque converter. Van was brought back in, new TC installed, still not shifting correctly (so said the shop) and another rebuilt transmission and TC was installed. Within a few days the downshifting problem is back. The van shifts and runs fine except under that one condition.
It would appear one of two things is happening; 1) the shop (albeit a part of a national chain) doesn't know how to fix the problem or 2) the problem lies with a sensor outside of the transmission. Any advice would be most appreciated. 
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#2
10-20-2004, 11:30 AM
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Re: Transmission - rough downshift
What type of ATF is in it. There is exactly one "correct" fluid, all others can cause this.
Mercon V fluid is the ONLY ATF that this transmission whould use. Standard "Mercon" fluid will often cause harsh shifting.
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#3
10-20-2004, 11:32 AM
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Not sure what ATF fluid the "national chain" put in. Will inquire. Thanks
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