120K miles. Had the P1811 (adaptive shift) code set and intermittent harsh shifts.
Tests with a recording scan indicated that the 1-2 shift was slow, leading to max tranny fluid pressure.
Installed the TransGo shift kit on the 1-2 and 2-3 accumulators yesterday along with filter and fluid change. (Ordered kit with filter from TripleEdgePerformance) and so far so good. Shifts are firmer, and the 1-2 shift is faster. Took about 2 hours to do the install at a leasurely pace.
Tips to save mess compared to more traditional tranny filter change (with no drain plug).
- The shift kit installs from the underside, car on ramps works.
- Use a suction pump (like the Mityvac MV7400) to remove most of the tranny fluid first.
- Us a large plastic pan/tub under the tranny to catch residual fluid, dropping parts, dripping, etc. WalMart has one that is about 5x16x22 inches for around $5
- it took 8 quarts of fluid to refill
This was faster and much easier than trying to replace the pressure control solenoid somes time associated wit the P1811 and may address other issues as well. The kit came with some additional parts for the 3-4 shift accumulator, etc., but they are hard to reach, and may not be needed to address the issue.