Ok so the trans now has Dex II / Dex III compatable ATF in it which brought me back to where I started, grinding on 3-4 at high RPM.

Thanks Charlie & Tom for the shift rod alignment primer, the linkage that was off by quite a bit is now aligned correctly.

However, I still have the grinding if I try to shift to quickly. Should I just chalk this up to old syncros and shift slow?

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1972 280SE 4.5