Like I said...its personal preference. I personally have ran low 11's on a stock open diff gsr tranny and really didnt have ANY spinning issues at all. I have seen people hit 9's with a stock open diff gsr tranny. So what exactly is the argument here? Right now I have a gsr tranny with a type-r diff. It really has been the BEST tranny I have ever owned. Dead hooks...fun on the streets.
Only reason I said type-r tranny is if you really felt you needed the lsd and didnt want to do any work internally to a tranny. Easiest route. But hey...thats just me. If I had the time and tools...mostly the time....then I would enjoy building my own trannys. lol