1986 300E driver side rear axle won't move

[Bonnie Western]

My 1986 300E has been sitting for about 9 months and now the left rear axle is frozen. My son took the wheel off and breaks and discovered that the axle would not move. I have found a shop that will replace the axle if I get it to them. I just want to know if that will fix the problem of if there could be something else. When I started the car the right wheel moved and drug the left rear wheel in forward and reverse.

Thanks for any help.