If your pilot bearing is toast or the cheap type one installed, it can lead to tough shifting because it won't allow the input shaft to spin freely and may also cause an uneven clutch release. It may also lead to premature front input bearing failure, You also need to make sure that the pilot bearing is non magnetic. A magnet should not stick to it. For some reason the magnetic ones cause problems in these older cars.
What gear oil are you using in the trans? It should run GL4 oil...That's a big debate, not going to get into it. But GM specifies GL4. Supposedly, the GL5 is not brass or soft metal compatible and may eat the softer metals. Synthetic gear oils are usually too good and eliminate too much friction on the syncros, which may lead to tougher shifting.
Bell housing alignment is important. If it's off, your pilot bearing or front main bearing could become toast. It can also cause uneven release of the clutch and vibration. It may also lead to premature front input bearing failure.
How much free play is in your clutch pedal? It's not a set in stone figure, but 1-1.5" of free play in the clutch pedal is usually a good starting point
My guess is it's the pilot bearing and the shaft is not running true on the trans.
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Ray
1970 SS Chevelle Van Nuys Built
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