today my front wheels were not engaged. finally when i got buried in the sand front end near wheels made loud popping noises, at that point had full power to the front end. few hours later, in the mud more popping noises and my front end stopped working for me again. hoping it is just hubs needing to be replaced. just had front and rear diff serviced, same with the t-case. also how would you rate milemarker locking hubs? thank you