I was getting nasty clunks on all shifts until recently. I replaced the brake booster hose because it's vacuum fittings were way past brittle. Suddenly got scary smooth shifts and basically no clunk. I still get it if I let it downshift itself into first, if I shift it manually into first it doesn't really do it, or if I take it out of gear when I'm approaching a stop it doesn't do it.

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Kanthaka 4