No speedometer and shifting hard just had transfer case worked on

If a problem is occurring just after other repairs being performed, I would reach out to the point of service to ask them to check it out for you as it could indeed be related to what was done during performed repairs. The vehicle speed sensor threads into the transfer case on the back of the transmission, so it would seem possible it may not be connected properly, perhaps. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops