Been preforming mods to c4 and it is very well written! Thankyou PaulS and anyone else who contributed In the section on drum mods...the bleed hole to be drilled at a slight angle from outside of bottom.... is this done with the #56 drill??? It is not entirely clear. Also the spring to be acquired: 1.95" free lenght, .650" outside diameter, .053" wire...... Does anyone know a source on where to find such a spring??
Wrenchingfords, The small bleed hole is not required unless you are turning your engine above 6500 rpm. The spring can be purchased with a TransGo shift kit #SK4-71. That is not the big reprogramming kit, it is a small inexpensive kit with a few springs in it. Don't do anything the kit says except use the correct spring (I think it is the green one.) The mods that you need are already taken care of in the valve body mod section. I have mine custom made but the kit contains a spring that is perfect for this use.
