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At 6-7,000 ft here in Washington, i find the stock clutching works well. Yes it could be improved but i didn't feel the need to.
What have you tried and run then? Higher gearing shifts better but also makes the clutches run hotter. I dont like the shift with 19/50s and 7 tooth at 10-12k ft but dont mind it on 8 tooth. For comparison my buddies 15 2.6 with 19/50 and 8 tooth had clutches that consistently ran 30-40deg hotter than my 15 with 7 tooth 3" and 19/50. I took multiple readings with a temp gun to verify this. Im gonna run either 20/49 or 21/49 on my 16 with 3" and 7 tooth. My 15 last year always pulled rpms and backshift fine as long as the secondary didnt wear out or was built incorrectly. Didnt like how it upshifted though
One thing to add,
When u got my clutch machined the dealer had to take a bunch of weight out of it to balance it.
So one big factor of getting machined is also the balance