Hey Chris--I don't need to make this old woman swallow her denture on the 1-2 shift
That's why you set the Band Clearance tight, Don't drill the 2nd Clutch Orifice, And follow the directions in the shift kit by using the lightest Accumulator Valve Spring.
**If you still feel the 1-2 is firm after the Band breaks in.....Remove the Accumulator Valve Spring altogether, But I doubt you or her will think it's too firm......This is the beauty of the TransGo Accumulator Valve Pin, You can swap springs without dropping the Valve Body.
Using the Corvette Servo is more about cleaning up the 2-3 shift & extending 3-4 Clutch life than gaining a firm 1-2 shift.
I'm sure you noticed that 4L60E's behind 4.3L's have a rough "Double Bump" 1-2 shift, Though it happens behind V8's as well......Problems are,
*Excessive Band Clearance
*.076" 2nd Clutch Feed Orifice, TG plates usually come with a .060" Feed, Though check it & make sure it's at least .059"
*To large a Accumulator Valve, Bet it has the largest one (Code D, DX)....Where it really needs a (Code A, AX, B, BX) Accumulator bushing & valve, But these are getting difficult to source & usually need to be robbed from 700R4 Valve Bodies.
*Notching the 2nd Servo Cushion Spring Retainer allows oil to freely drain out from behind the Servo, In stock form, Oil gets trapped, Causing a hydrolock where the Cushion Spring is no longer effective.
*Needs additional Servo Cushion Springs, The TG Shift kit comes with.
Installing a new 1-2 Accumulator Housing assembly also guarantees no crossleaks which can cause erratic 1-2 shift feel. Sonnax Pinless Accumulator Pistons also eliminate crossleaks......BUT, They also restrict the range of Accumulation.
Blocking the 4th Accumulator is standard procedure.....Even with a .093" 4th Clutch Feed Orifice, The 3-4 Shift will still be barely noticeable. I drill mine out to .110" on V8 builds.