Re: "600w" trans lube foamy.
37,
Not fair for me to comment on either Bratton's or Synder's 600w gear oil as I have no clue how it is created but I have used both. More recently I've been using 140 gear oil from 'Sta-Lube' & 'Lubriplate', as that weight is specified in the early V8 Service Bulletins.
My experimenting with all weight gear oils is because I drive (attempt) a multi-disc clutch which is very non-forgiving, unlike a single disc clutch. A single disc I can 'wind up' much farther with no gear chirping.
After many miles & gear oil changes, it is evident it is the nut behind the shifter. With idle speed correctly set, you still need to take time between gears. Non-syncro, straight cut teeth, & thick gear lube, slow shifting is the nature of the era.
Very different from a close ratio 4 speed Shelby Mustang.
Keep practicing & Enjoy.
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