Is 4th the only gear it'll keep from grinding? I was reading a writeup on things to help extend manual trans life, and it said put it in any forward gear, then reverse. It keeps the gears from clashing basically (don't recall what exactly they said it does). I think that was in Car Craft. My old 3-speed does the same, but if I put it in any forward gear it doesn't clash at all. I'm running the factory-installed linkage from a junkyard Malibu, from the pedals down to the clutch fork/bellhousing. Only new part is the pivot for the fork pushrod, original was pretty worn. It's worked great for me the 8 months or so of driving in the 6 years or so that I've had it.