what screw do i adjust to make make my slayer shift faster low speed or high speed needle
You don't adjust the engine needles to change your shift point. You adjust your needles to tune the engine correctly, then adjust the shift point in the transmission.
I would suggest you read the manual here: http://traxxas.com/sites/default/fil...7_manual_0.pdf
Instructions for tuning the engine begin on page 26.
Instructions for adjusting the shift point are on page 33.
The most common reason the transmission won't shift is because of the tune. The engine isn't getting to the RPM needed to shift. Make sure your engine is tuned right before adjusting the shift point.
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