Most vehicles will have a natural equilibrium point cooling wise based on ambient temp/load/airflow/coolant type/mix and so on, my Mk3 at heavy load/550rwhp was 91c +- 2c, my current project is close to the same as it uses much the same size/construction/brand radiator, no amount of cold T Stats...
I like the fact that it will thermosyphon after shut down and pull heat out of the CHRA reducing the chance of coking, but as you say a good Synthetic shouldn't coke :)
I used all 2005 Holden accessories on mine, same model year as the L98 engine I bought.
I'd have to double check but almost certain it was a 2004 F Body pan, got it out of a dealer in AZ.
It's long gone, yep made my own mounts, I used an a340e and an adaptor I built so trans mount was stock, only thing I had to move was the crossbrace between the LCA's, I machined up a billet T6 6061 one that incorporated a bashguard.
I'd be looking at the Uni Joint phasing then balance.
I have a shop I've used for 30+ years never had an issue then I did, somehow not balanced correctly and a brand new shaft built with the best parts $ could buy...
Had me scratching my head for days...
Vibration is rarely a pinion angle issue, just look at some of the retarded angles Offroaders run, more often than not it's a balance/phasing problem.
Angle usually becomes a problem under power and will cause windup in the driveline.
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