4l60e question
Thread Starter
Staging Lane
Joined: Jan 2019
Posts: 57
Likes: 0
From: florida
ok so i pulled apart the pump valves and all of those look good so i put the molded pistons in the front drum and applied air to the input shaft and the only air that leaks is from the orfice cup plug by the input shaft if i cover that with my finger it dont leak at all also there dont show to be any air leaking at the input shaft
Thread Starter
Staging Lane
Joined: Jan 2019
Posts: 57
Likes: 0
From: florida
then i put the input shaft into the pump and pressure tested it and that acted funny when you applied the 3/4 piston it wanted to leak out another hole then it was like a valve moved and it didnt leak anymore dont know if that is possible or not
TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
Not sure what valve it may have been. I have had that issue before but I believe it was sealing rings on the input shaft not sealing well from being sized. Make sure you get the Valve-body gaskets in the correct place. Make sure the 3-2 downshift solenoid and the TCC PWM solenoids are fully seated and the clip in the right groove of the solenoid. Also make sure the EPC solenoid valve spring retainer & clip is in the proper groove
I have a list of self inflicted wounds(dumb stuff I did from being sick and working or running 150 MPH while building) on the 4L60E see the attachment
I have a list of self inflicted wounds(dumb stuff I did from being sick and working or running 150 MPH while building) on the 4L60E see the attachment
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
hello i am new to the forum and have been working on a 4l60e out of a 2003 suburban it had burnt 3/4 clutches rebuilt the trans and installed the better clutches and did a full rebuild with all clutches and steels and torque converter and replaced the formed pistons also had to replace the spacer plate cause a couple of the valve body ***** were about to get stuck or go through and installed the trans and had reverse and first and second but no 3rd or 4th but if you unplug the electrical connector on the trans it would default to third and you could get 50 mph at 2500 rpm so i pulled the valve body off and checked all valves and solenoids and replaced all solenoids and harness and pressure manifold and reinstalled valve body and still no 3rd or 4th but this time it would goto 3rd and just free spin like when the clutches were bad so i got a air pressure plate and tested and sounded like it was leaking so i pulled the trans back out and tore it down and all clutches and o-rings are good i did find a piece of the old green o-ring under the new piston for 3/4 but the new o-ring was still good but one thing i can not find anything on is the input clutch housing orificed cup plug you can see the ball down inside the drum and its stationary and does not move if you look on the turbine shaft side it looks like its a stacked tube like the ball should move just wanting to see if anybody has had this issue or knows about that orifice
Thread Starter
Staging Lane
Joined: Jan 2019
Posts: 57
Likes: 0
From: florida
ok so put trans back together then put it back into truck
has no 3 or 4 is there any way the park neutral switch can cause this
i did find the 3/4 accumalator piston pin was damaged .replaced both piston and pin
also used valve body off another 4l60e to see if it was possibly that
has no 3 or 4 is there any way the park neutral switch can cause this
i did find the 3/4 accumalator piston pin was damaged .replaced both piston and pin
also used valve body off another 4l60e to see if it was possibly that
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
well you already mentioned a leak when air checking...
there are lots of things that can cause no 3rd or 4th
have you checked that those gears are being commanded
have you done a pressure test
its possible something is bad with the rebuild
short answer...no...the neutral safety switch will not cause this.
there are lots of things that can cause no 3rd or 4th
have you checked that those gears are being commanded
have you done a pressure test
its possible something is bad with the rebuild
short answer...no...the neutral safety switch will not cause this.
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TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
ok so put trans back together then put it back into truck
has no 3 or 4 is there any way the park neutral switch can cause this
i did find the 3/4 accumalator piston pin was damaged .replaced both piston and pin
also used valve body off another 4l60e to see if it was possibly that
has no 3 or 4 is there any way the park neutral switch can cause this
i did find the 3/4 accumalator piston pin was damaged .replaced both piston and pin
also used valve body off another 4l60e to see if it was possibly that
1)Does it stay in 2nd all the time or do you feel the attempt to shift to 3rd and nobody is home?
If you feel the gear change and all it does is slip, you have a loss of fluid somewhere. If it never makes the shift you could have a command problem.
2)If you disconnect the trans fuse(or disconnect the main trans connector), does it default to 3rd gear? Limp mode is 3rd gear and a manual second gear if selected.
Do you have access to a bi-directional scan tool? Snap-on Solus or OTC Genisys family for examples. check to see if the shift solenoids are changing state and requesting the gear.
Thread Starter
Staging Lane
Joined: Jan 2019
Posts: 57
Likes: 0
From: florida
with the scanner it shows 3rd but no change in rpm but with the plug not plugged in on the trans it will default to 3rd
figured if there was something internal it wouldnt drive if 3rd had something wrong
figured if there was something internal it wouldnt drive if 3rd had something wrong
Thread Starter
Staging Lane
Joined: Jan 2019
Posts: 57
Likes: 0
From: florida
when default 3rd is showing always commanded
when trans plug is hooked up shows it goes to third but no change but then shows it goes to fourth and just free spins when it shows that
when trans plug is hooked up shows it goes to third but no change but then shows it goes to fourth and just free spins when it shows that
TECH Junkie
Joined: May 2012
Posts: 3,050
Likes: 715
From: Poplarville, MS
It sounds as if you have an electrical problem. With your scanner can you see if the A and B shift solenoids are turning on and off as shifts are commanded? For a 3rd gear shift both A and B shift solenoids are turned off.