Just replaced my T case through a transmission specialist, apparently it worked in the workshop but since then i have not been able to select centre diff lock. I have since been under the vehicle to change the setting on the diff lock but cannot get high or low to stay in.
Any suggestions?

Also i am having a winding nosie coming from under the car unrelated to the T case, Suspect diff, crown wheel and pinion. Any suggestions there?

cheers Josh

 

My suggestion is to go back to them and get it fixed right.