Hi everyone! I've had my 2004 taurus for about 2 months now, and I have discovered an issue. Normally, my 1-2 shift is very good, as well as all the other shifts. Very crisp. However, after driving on the highway for 15+ mins, the 1-2 shift gets very harsh, but intermittently.
Example. I took the taurus on a 300 mile round trip 2 weeks ago. All highway. Got about 25 mins into the trip, and got detoured through lansing due to an accident. Starting from the first stoplight after getting off the highway, the 1-2 shift was very harsh, it knocked my sunglasses off my visor. Starting form the next light about 1/4 mile from the first light, the 1-2 shift was great! As was the next one! Then, again, the 1-2 shift was very harsh. Its very random, but ONLY when the transmission is well warmed.
I noticed that if I keep the gas pedal around 1/4 - 1/2 of the way down when starting out (merging on highway from rest area, for example), and it decides to shift hard into second, it will SLAM into second, then shift back into first, then SLAM into second again, until I let off the gas and let it settle down. Then all is well. Really weird! Otherwise it shifts great!! If it cools down for a half hour, the transmission shifts excellent, good as new!
I checked the transmission fluid and it is almost to the top of the hash marks when warm, in park. It is not burnt, or browned. It looks new. I have no codes. Cruise control works, speedo works (reads about 3 mph slow, but thats normal I think). All my research points to replacing the vss
), but I wanted some other input before I start throwing parts at it.
It's a 2004 with a 3.0 Vulcan, AX4N transmission. The car has 146k miles, and otherwise runs like brand new. Thanks!