Transmission Hesitates going from P or N to Drive
 

From Park or Neutral, when I place the transmission in Drive it hesitates approx. 2 to 3 seconds before Drive is engaged.

Vehicle: 1995 Chevy Blazer, 4 Door, 4x4 w/ 166K miles
Engine: 4.3L V6 RPO=L35
Transmission: 4L60-E

Work performed to date:

* Performed Transmission F&F Change w/ MaxLife Synthetic and Lucas Transmission Fix
* Cleaned upper intake manifold and replaced fuel regulator
* Installed new fuel filter
* Checked fuel Trims - Good after I replaced fuel regulator
* Replaced EGR valve
* Installed new heated O2 Sensor on header side (before catalytic converter)
* New plugs, Plug Wires, Cap, & Rotor
* Checked air filter - good
* New Serpentine Belt

The transmission F&F change w/Lucas did help the hard shifting between 1st and 2nd.

Any suggestions?