More PSI?

Should i attempt to use more PSI out of first Gear?
i think im running 86psi to first gear...and i do have a shot pinned after market output shaft in my 4L65E so the trannys pretty built but im running a Billet Servo and i used to br running 91psi and i would be able to chearp the tires and now i cant...id like to attemot to get up there with out blowing another output shaft


thanks guys

Chirping tires on 4,000+lbs vehicle = broken output shafts.

Thats a LOT of mass your shock loading into the shaft.

Keep the stock tranny pressures!!!! If you want more bump in the 1-2 shift, get servos and stiffer springs for the 2nd accumulator.