Im getting my 4l60e rebuilt and my builder says that I should go ahead and buy a billet servo. He is out of town for now, so I cannot get ahold of him but he wasnt specific on if I needed a 4th servo or a 2nd servo or both... what should I buy?

The rebuild will be pretty much stock except for hi-temp clutches. Its going into a 98 z28 with a ms4 and 3200 converter.

 

If you want a firmer shift an more holding power then you could just go with what some call a corvette servo which is used in many other 4l60e transmissions. Either way it will not hurt to upgrade the servo and it is relatively inexpensive. 2nd gear is exposed to more energy than a 3-4 shift, if that helps.