Search my postings. I have a video that sounds exactly the same. It's the IWE bouncing off the hub as the vacuum pressure can't hold the spring any longer. Was fine when revved a it created higher pressure.
Could be two problems. Search transmission hard shift in the forum for lead frame grounding. For the 2h to 4h It's likely an internal plastic comb that aids in the shift process that fails. Been there done both. The latter issue provides some evil sounds and clunks.
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