Transmission 2 4 servo 4l60e install#
Transmission 2 4 servo 4l60e full#

Sharp edges will cut the sealing rings on the pump causing leakage in the reverse circuit then you will have to take the trans out again.ĪLWAYS replace the torque converter during an overhaul. Check the bushings on the new drum very carefully for sharp edges. If the outside is glazed real bad from the band slipping then replace the drum. The reverse input drum is the first thing you see as soon as you remove the pump. Third, since you were having servo issues and a slipping 2/4 band, inspect the reverse input drum carefully.

Transmission 2 4 servo 4l60e install#

This will allow you to rebuild the input drum without having to buy lip seal protectors to install the metal pistons. When you rebuild the input drum, remove the metal pistons for the input, overrun, and 3-4 clutches and install molded rubber pistons. First, since you are having servo issues, I would personally install a corvette servo for more firm 1-2 and 3-4 second, clean out the servo bore using a GREEN scotch brite pad to scuff up the bore surface where the sealing rings contact then spray out completely with brake clean. A couple of tips here with your overhaul. That slipping in 4th tells me what I originally thought. The rebuild kit has new frictions, steels and pistons. 77767K / A74905BK / 74020AKR - Chevy 700R4 4L60 4L60E 4L70E Transmission 2-4 Servo 4th Gear Servo and Band. Hopefully after this, I can get another 150,000 miles out of it. I have ordered the master rebuild kit and am hoping to dig into this thing this weekend. Ok, now it is starting to slip a little at highway speed in 4th. The 2-3 shift might be a little more crisp from the corvette servo releasing. As far as someone installing the corvette servo, you would see firmer 1-2 and 3-4 shifts. Since the job of the accumulator is to cushion the shift, any leakage here will cause harsh shifting. What generally happens here is the steel piston pin wears the pin bore in the aluminum piston, the pin bore becomes egg shaped and will leak at the bore.

Transmission 2 4 servo 4l60e full#

If its not a full line condition I would check the 2-3 accumulator.

With your truck and the harsh 2-3, I would first check for codes which would cause a full line command from the computer. Does it sound like someone installed a corvette servo? I just bought it with 100,000 miles and now it has 110,000. It only shifts harsher when I am cruising with light accelleration. The only thing I can think of is maybe an accumulator spring is broke causing a harsh enguagement. Is this normal? Funny thing is when climbing hills or when I'm accellerating hard, the 2-3 shift is as smooth as the others. In my pickup, it shifts fine through all the gears, but at some points the shift from 2-3 seems harsher than the others and you can sometimes hear a clunk.

I have sort of a following question for the 4l60e trans experts in this thread. In many cases this transmission element turns out to be very problematic and frequently requires replacement. What are the benefits of a corvette servo? In many automatic transmissions, it is a part of the hydraulic system which transmits pressure to the overdrive clutch.