Trane downflow 92 gas furnace blower replacement

I have a 80KBtu furnace that has a variable speed blower that is making a lot of noise, probably due to the bearings wearing out for being on recirc 24/7 for the last 10 years.. What is the best way to pull the blower. Do I come in from the front? Or do I have to pull the stack apart and come in from the top?