I have a 97 z28 with the 4l60e. I have modified the tranny line pressure with using obd1 pcm and tuner cat but with the supercharger (5#) it hits redline before shifting. Without the supercharger it shifts fine. I know the corvette servo mainly helps the 1-2 but because it is also an accumulator, does it help the 3-4 shifts enough for this purpose (350 rwhp/tq)?

Hal

 

I also would like to know this question. I hit rev limiter to before it shifts also. I have like a 200 rpm jump before it shifts and the trans was just rebuilt. Shifting at 6500 rpm.

 

all f-bodys (Lt-1's at least) have vett servos already in them,and I cant beleive trans shops charge extra to have them installed during a rebuild,to adjust any shift point on an a-4 requires computer programing,

 

Thank you WP for that clarification.

Hal

 

It will help the 2-3 shift because it directs more oil to the 3-4 clutch pack during the 2-3 shift. This is the main reason GM made the Corvette servo according to the story, was to improve the 2-3 shift (it can eliminate the 2-3 flare up).