I need to replace my rear Shimano Deore derailleur since it got mangled up in an accident. I'm thinking of replacing it with a Shimano America RD-M662 SLX 9-Speed Derailleur. The bike I have is a 2013 Salsa Fargo 3. It already has a set of 9 speed Microshift bar end shifters. Will this setup work? The Microshift worked fine with the Deore, but will it work with the SLX? Does the SLX require a different cable pull than the Deore? Any help would be greatly appreciated!
Yes, this will work. Just get any Shimano mountain rear derailleur... SLX, deore, LX, xt, xtr, etc...
This only applies for 9 speed and lower. Here's a quote from Sheldon Brown.
Within a given brand/style of rear derailer, all "speed numbers" are generally interchangeable. This applies to all indexable models, basically everything manufactured since the late 1980s. There are a few exceptions:
The exception for Shimano
Shimano "Dyna-Sys" 10-speed shifters and derailers use a longer cable pull than other Shimano models, and must be used together.