I am having a problem with a 4l60e. The problem started a few weeks ago when It developed a slow/hesitant 2-3 shift at part throttle and hitting the revlimiter at wot. I figured the 2-3 pack/band had taken a crap so I ordered parts to fix it. Well i pulled the tranny out yesterday and the parts were a little worn but nothing to indicate the slow shif or wot flare. I replaced the red clutches with another set and fresh kolene steels as well as a new carbon fiber alto band. I also installed a sonnax servo and boost valve. I put it all back together and am having the same problem a slow/hesitant 2-3 shift especially when cold. It takes 1.2 seconds to shift when cold and feels really sluggish on the 2-3

The 1-2 and 3-4 are great it's just the 2-3
Any suggestions?

 

Do yourself a favor and get rid of the Alto clutches in the 3-4 pack and go with the Borg Wraner Hi-Energy clutches. You can make it an 8 clutch setup by using the clutches from a 4L60E, or 9 clutch setup by using the clutches from a 4L65E. There are different pressure plates and thickness of steels aand thinner snap ring here to get the right clutch clearance. The Alto band is ok, the Alto clutches leave a lot to be desired.

 

Well I had them before and they lasted alot longer than the zpak I tried once but I was told more clutches means thinner steels which leads to warpage from heat after a few pulls. So I decided to try the reds. If they don't last I will go back to the Borgs. I thought there was a problem with them when i pulled it apart but they seemed ok a little toasty but not bad. Probably from driving it with the lazy 2-3. The band was also fine. I think there is a failing solenoid or trash somewhere but no codes.

 

OK well dropped the VB and cleaned it and found some damage. Got a new COMPLETE VB and istalled it. Still has the weak 2-3 shift and I am all out of Ideas. New Red Clutches, Kolene steels, alto carbon fiber band, new sonnax servo, boost valve, new valve body and reverse drum......still a weak 2-3.....any ideas

 

Did you inspect the inside of the pump stator for wear in the area the teflon rings ride. I have seen this several times it will result in the problems your having and repeated 3-4 clutch failure?

 

No I have not. I was being lazy and didn't wanna drop the transmission again but I definitely will. I have a few extra good pumps I will just swap one out. Thank you for your reply

 

Also check the ball & capsule inside the servo bore for leakage.Do you still have the load springs in the 3-4 pack?

 

I have that ball blocked off with a plug and the load springs are long gone. Thanks for the suggestions though

 

Are you sure the plug is not leaking?Those load springs should be put back unless you have the trans go high rev spring kit installed.

 

I have a transgo kit installed and im pretty sure the ball is not leaking