nice to hear from ya! I done a fair bit of digging to find that but really I would just buy a transmission suitable for what you are doing. I think (think as in using my common sense) that if you go too big of a transmission (say it holds 900 but you're pushing 400) that you will lose alot of power because the gears and shifts and all weigh more (more heavy duty) and so it takes more to turn the shifts and all. I think the average drivetrain system is 70 to 80% efficient but it could go down if you aren't careful. I personally would get a transmission with that spline count (or you can use an adapter kit) and a custom bellhousing and I would run it like that.
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