PLEASE Help Its the Transmission Again

[daluvabull]

Just replaced my 3rd transmission in 5 yrs- ugh
1st Cottman rebuild
2nd Local shop reuild
3rd used 4.44 with rear diff and shift mod

Currently shifts are irratic. Does not seem that it shifts down to lower gears until it warms up- resulting in a blinking power light. At times it shifts good. Other times it seems to stay in 3rd. If manual is selected, it most usually shifts ok. The power light does not luminate at start up or when the ignition is on. Consequently, an error code cannot be identified. The mileage is 182.5K. It has an externl cooler and filter. All warning lights illuminate under hard acceleration while attempting to shift down from 3rd to force a shift to 4th on the freeway. Additionally, all warning lights fade on and off occassionally. The car will roll while in drive with the engine off.

Bad install, connection or TCU? If TCU, any ideas on availability and cost of a used one? Where is the TCU located. A search of the How-To documents was not fruitful.

Of course any insight or suggestions that can be offered are greatly appreciated.

Peace,

Jeff