My biggest frustration on this is that this started a week before Christmas and my written explanation to them of the Problem was: (Keywords) only during light acceleration, only over 40 MPH, seems when 4th gear is ingaged.
If you take a look at TSB 21-05-97 (thanks Argus)
SYMPTOM: Transaxle shudder during a 3rd gear to 3rd gear partial EMCC
(Electronically Modulated Converter Clutch) engagement, 3rd gear partial EMCC to 4th gear partial EMCC engagement, or 4th gear to 4th gear EMCC engagement. Vehicle speed will be above 40 mph to obtain these shift points. This condition can be the result of worn out automatic transaxle fluid, using additives in the transaxle fluid, or from using the wrong type fluid (Dexron II, III, or Mercon) in the transaxle.
Bring the vehicle to normal operating temperatures. Drive the vehicle on a smooth road while accelerating through the gears with light throttle application. Pay particular attention during the EMCC shifts that take place between 3rd and 4th gears above 40 mph. If vehicle shudder is noticed during the shifts, perform the Repair Procedure.
1 04864505 Filter, 41TE Transaxle
1 04796730 Filter, 42LE Transaxle
AR(1) 06032780 0-Ring, Filter
AR 04798233 Oil, ATF+2 Type 7176 (Qts)
AR(1) 82300234 Sealant, RTV
POLICY: Reimbursable within the provisions of the warranty.
Labor Operation No: 21-55-01-96 1.6 Hrs.
My biggest gripe is that alot of my keywords are in the service bulletin right on the money.