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Well so much for that idea!
The benefits of the GM Synchromesh have slowly degraded over the past week. It's still better than it was, but not nearly as slick as the first two days after the swap. I guess I found the first gearbox where GM Synchromesh isn't the best answer.
I swapped it out last night for Motylgear 75w90. It's shifting better again, but I hope these benefits last. I'm anticipating a new transmission in the next few years. The weird thing is that the gears don't gnash or grind when shifting, it's just very stiff on the 1-2 shift, even if the revs are synced perfectly.
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