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The 4th apply piston/servo or 'overdrive' servo affects the 3-4 shifts. So to sum up: the 2nd apply piston/servo is often advertised as the 'Corvette servo' or 'intermediate' servo and affects the 1-2 and 2-3 shifts.
#Billet corvette servo 4l60e upgrade#
In recent years, an upgrade for the 4th apply servo became available through aftermarket suppliers. There are several different manufacterers of this servo but the dimensions are the same. Over time it became known simply as the 'Corvette servo'. This servo has a larger apply area and gives firmer 1-2-3 and 3-2-1 shifts. When GM began using the 700R4 in Corvettes and some Camaros, it featured an upgraded 2nd apply servo. If the area of the servo that the fluid comes in contact with is increased, the servo will move with greater force. This animated schematic shows how fluid flows and the servos move: Īs I mentioned earlier, fluid pressure moves the servos. When fluid under pressure is routed through one of several circuits, the servo(s) move in or out applying or releasing the band. The opposite end is tapered and rests against the clutch band. The outer end of the pin rests inside the overdrive servo. Going lengthwise through the center of all servos is a servo pin. Inside the 2nd apply servo is a stout spring there is also another spring between the overdrive servo and the intermediate. It controls the 1-2-3 upshifts and 3-2-1 downshifts. Immediately behind this servo is the two piece 2nd apply servo aka 'intermediate' servo. It controls the 3-4 upshift and the 4-3 downshift. Inside the cover is the 4th apply piston aka 'overdrive' servo. The outer cover is circular and is held in place by a snap ring. The servos in the 4L60 are located on the front passenger side of the tranny housing just above the oil pan. Without getting too technical, applying and releasing clutch packs determines power flow through the planetary gearset and the end result is 1st, 2nd, 3rd, and 4th gears. Servos are essentially aluminum pistons that apply and release the clutch band. Servo -a control system that converts a small mechanical motion into one requiring much greater power. Before I go any further, let me give a brief description of how servos work.
![billet corvette servo 4l60e billet corvette servo 4l60e](http://3.bp.blogspot.com/-jCXASymc4Ds/TtZ8paoVENI/AAAAAAAAADo/q9KPzZrFzHg/s660/corvette%2Bservo.jpg)
In 2007, I installed aftermarket servos to improve shifting and prolong the life of the band and clutch packs. My intent is to share what I have learned about performance upgrades with other members who like myself were not aware. I don't consider myself to be an expert no doubt there are members who could take a 4L60 apart and put it back together blindfolded. I slowly began to realize that a 700R4 would last a long time if it wasn't abused and wasĪfter buying my Colly I would occasionally think about ways to improve the 4L60E in terms of durability.
![billet corvette servo 4l60e billet corvette servo 4l60e](https://i.ytimg.com/vi/04phW1VFGIw/maxresdefault.jpg)
I got the tranny rebuilt (with a basic shift kit) and almost 200K miles later, it was still going strong. It had a new GM Goodwrench engine, but the 700 R4 tranny was on its way out. Eventually I ended up buying a used S-10 Blazer.
#Billet corvette servo 4l60e manual#
While growing up and early on in my 'driving' years, I preferred manual trannys over automatics. It is easy to rebuild and can be strengthened to handle significant horsepower and torque. Although there are folks who hate the 4L60 with a passion and the 4L80 is recognized as a much stronger unit, the 4L60 has gained much fame in the performance and aftermarket arenas.
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