Aluminum or steel driveshaft ?

[big gear head]

You have to be sure that you have clearance for a larger diameter shaft. You don't want it rubbing on something like exhaust pipes or floor braces.

I doubt that you would need to go with c clip eliminators if you buy quality axles. C clip eliminators have their own set of problems when used on the street. For one thing they tend to leak oil on your brakes. Once you install c clip eliminators it's very hard to go back to original.