4 speed ka-booom !

I modded my tranny to work with synthetic. But I found, for my application, it wasn't any better shifting than running 50/50, ATF/80-90 conventional. But I'm a streeter.
I experimented with different ratios of ATF to EP. I found that generally 100% EP oil was slightly slower shifting. I surmised that the brass rings were having a hard time squeezing that fat oil off the cones. I also found that 100% ATF ,also seemed slower. I surmised that the thin oil was not helping to slow those big fat torque handling gears down. After trying a few different ratios, it seemed that 50/50 was as good as it gets.Being a streeter, there's no good way to prove it, so I left "good-as-it-gets" alone.
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The mods for synthetic were simple. Knowing that, that stuff is so very slippery, my first thought was that the brass rings were gonna have a hard time doing their thing.The ring's job is to grab ahold of the cone and slow it down to synchronize the cone speed to the slider speed so that the shift can occur without grinding. Grinding is not good.So yeah, slapping synthetic in with no mods proved that.I also had a thought, that the struts were gonna have a hard time staying in their parking spots during the synchronization period. So down the tranny came. (By this time I was getting pretty good at that).
I modded all but 1st. What I did was cut a channel in the face of the cone. The idea was to provide a path for the synthetic oil to escape.That stuff sticks like glue.The channel was from the bottom of the cone to the top. I made it about 5/16 inch wide, and a little better than 1/16 inch deep. I used a die-grinder with about a 5/8inch (don't recall the exact size) cutting wheel.I made three of these on each cone, about 120* apart.Then I deglazed the cones, as described in a previous post.Then, as to the strut concern,I grabbed some extra energizer springs, and after stretching them all out a bit I doubled them up. I used the square section type. And finally,I slammed it all back together.(yeah I've got some assembly secrets,too). This worked really well, and I found out later, that this mod also works well with EP oil. That's all I needed to do.
With the pseudo slick shift mods I made, this tranny shifts like lightning. And with the re positioned shift-stick and 1/2 inch rods, missed shifts are a thing of the past.I cannot recall missing a shift since that early time, somewhere around 2004/5.