For A/C service I have always gone to punjab car AC, I know they are hell expensive but I am satisfied.
Clutch/Gear any mechanic with a test drive can tell, I dont think there is going to be any issue with gear but clutch might need replacing.
For suspension and other works go to jehangir autos. He is on the road where gangaram hospital is. As soon as you cross gangaram emergency while going towards cheering cross. Its the first small street on right side.