I have a mechanic friend that said it is no big deal to use old bearings and stuff. He said he always used the bearings and shims and stuff as long as the bearings were good. Is this acceptable? Why I'm asking is that I'm thinking of going 4.56 instead of the 4.10s I have. Down the road I will swap out the front and go 4.88s. Of course the costs keep escalating on my project. Would it be worth buying new 4.56s (not finding any used) and save the cost of 2 master instal kits since I'm going to be changing later? Should I just save my money and just stick with the 4.10s and 31s I have now? 33s and 4.56 look tempting. I have to install 4.10s up front so that is one end I'm already regearing. Any input? Thanks