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Something is not right if the syncros are going out repeatedly. This should not be a problem with either NWC or WC. I only work on WC T5s, so can't really help with the why. If you are wanting a replacement I would look for a WC T5 with the Chevy bolt pattern. You should be able to use your current tail housing. If you are going a rebuild again you could change out the tail shaft and retain your speedometer gear.