Yes, Z28 cars had the corvette servo. The servo only applies the band. Burnt 3/4 clutches is most common failure point we see on 4L60E's. Lots of different reasons for them to fail.is a z/28 servo in a 4l60e basically the same as a corvette servo? what would cause a 4l60e to burn up the 3/4 clutches, corvette servo? looking for info.
It's also acts as the accumulator for the 2-3 shift when pushing the band off.Yes, Z28 cars had the corvette servo. The servo only applies the band. Burnt 3/4 clutches is most common failure point we see on 4L60E's. Lots of different reasons for them to fail.
Two things I would look at for this repeat failure. First is to make sure the input drum isn't leaking where the input shaft is splined into the drum. You have to air check the drum with some fluid around the base of the input shaft to verify this. Second, make sure the correct position, and sealing of the encapsulated check ball that intersects into the servo bore. The valve body has to be removed to do this. Those are the two most likely causes for a repeat failure.fairly fresh trans. gm trans tech building them for me had this in and out about five times for this concern. really getting old, hope I haven't spent the money for a rebuild for nothing. might start looking for different rebuilder after this is resolved.