First of all congrats for securing great rank in JEE . Here are top NITs rankwise for mechanical engineering:

1. National Institute of Technology, Tiruchirappalli. 

• 2- National Institute of Technology, Surathkal. 
• 3- National Institute of Technology, Warangal. 
• 4- Motilal Nehru National Institute of Technology, Allahabad.

These are top 4 NITs you can opt for mechanical branch .