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I have a '97 Tbird with a 4.6 and no modifications. I have noticed lately that my tranny shifts roughly when going up a grade at low speed. I have had the tranny fluid changed, the computer reprogrammed, and the 1-2 accumulator piston changed (just for general principles); and still have the problem. The problem occurs when I am driving along at low speed and start up a grade. The car will be going about 35 mph at 1000-1100 rpm (4th gear) on the level, then try to downshift once going up the grade. When it downshifts, it doesn't shift smoothly and seems to hesitate. I noticed the problem when I picked the car up at the dealership after they replaced the plastic intake manifold. The battery had been disconnected during the intake replacement.
The tranny doesn't have any problem shifting under acceleration.
Has anyone else noticed this issue?
Is it something I should be worried about and can it be fixed (without rebuilding the tranny)?
Once the computer re-learns the parameters will the problem go away (it has been 3 weeks and the problem still exists)?
Should I just turn off O/D around town and on hills (I live in western PA so I'll be turning it on/off a couple of times everytime I drive anywhere, which will get annoying quickly).
Would a chip help, since it would increase the shift points?
Why does it shift into 4th so early at low speeds (100 yeards out of my driveway @ 30 mph it is in 4th)?
Any suggestions would be appreciated.
The tranny doesn't have any problem shifting under acceleration.
Has anyone else noticed this issue?
Is it something I should be worried about and can it be fixed (without rebuilding the tranny)?
Once the computer re-learns the parameters will the problem go away (it has been 3 weeks and the problem still exists)?
Should I just turn off O/D around town and on hills (I live in western PA so I'll be turning it on/off a couple of times everytime I drive anywhere, which will get annoying quickly).
Would a chip help, since it would increase the shift points?
Why does it shift into 4th so early at low speeds (100 yeards out of my driveway @ 30 mph it is in 4th)?
Any suggestions would be appreciated.