Update !!!
Sir today I performed road test with Electrician and connected a scanner. I opened ECT parameters where I selected
1) TCC Lockup
2) Engine Speed
3) NT
4) Gear position (TCC Slip was not available in list of parameters so I decided to see difference between RPM and NT as you told)
At around 65 km/h the TCC lockup status turned ON , engine speed was around 2000 and NT was around 1500 on increasing RPM to 2100 NT still remained 1700 but not matched with engine speed.
Also I scanned ECU again for any slip codes but still no codes. Now what you suggest???