4l65 late/no shift issues
Thread Starter
Teching In
Joined: Mar 2014
Posts: 33
Likes: 0
4l65 late/no shift issues 4l65 off a Silverado ss. I cannot get this thing to shift when the computer tells it to. When logging the shift commands at part throttle I can see that the computer is sending the shift command, but the shift does not start to happen for several seconds. At WOT it will stick on the rev limiter until I let off the throttle.
The log shows that the computer is telling it sometimes to shift to third and even fourth before the 1-2 actually happens. With the engine off I can command the shift solenoids and hear all of them clicking so there doesn't seem to be a communication issue. Is this a pressure issue?
The log shows that the computer is telling it sometimes to shift to third and even fourth before the 1-2 actually happens. With the engine off I can command the shift solenoids and hear all of them clicking so there doesn't seem to be a communication issue. Is this a pressure issue?
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
4l65 off a Silverado ss. I cannot get this thing to shift when the computer tells it to. When logging the shift commands at part throttle I can see that the computer is sending the shift command, but the shift does not start to happen for several seconds. At WOT it will stick on the rev limiter until I let off the throttle.
The log shows that the computer is telling it sometimes to shift to third and even fourth before the 1-2 actually happens. With the engine off I can command the shift solenoids and hear all of them clicking so there doesn't seem to be a communication issue. Is this a pressure issue?
The log shows that the computer is telling it sometimes to shift to third and even fourth before the 1-2 actually happens. With the engine off I can command the shift solenoids and hear all of them clicking so there doesn't seem to be a communication issue. Is this a pressure issue?
Thread Starter
Teching In
Joined: Mar 2014
Posts: 33
Likes: 0
Going to check line pressure later, might not have a chance until the weekend but Im not driving it anyway.
The trans was sitting around for potentially months, it came from a parted out truck and supposedly worked well before. If there are parts sticking in the valvebody from dried out fluid having been in there, how do you get them unstuck?
The trans was sitting around for potentially months, it came from a parted out truck and supposedly worked well before. If there are parts sticking in the valvebody from dried out fluid having been in there, how do you get them unstuck?
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Going to check line pressure later, might not have a chance until the weekend but Im not driving it anyway.
The trans was sitting around for potentially months, it came from a parted out truck and supposedly worked well before. If there are parts sticking in the valvebody from dried out fluid having been in there, how do you get them unstuck?
The trans was sitting around for potentially months, it came from a parted out truck and supposedly worked well before. If there are parts sticking in the valvebody from dried out fluid having been in there, how do you get them unstuck?
Thread Starter
Teching In
Joined: Mar 2014
Posts: 33
Likes: 0
According to my pressure gauge, pressure seems low at idle and in gear, but builds sufficiently. Idle is around 50 lbs, reverse sits at 65 lbs. Putting it in reverse or drive and holding the brake while pushing the gas it hits over 100 at very light throttle, and it goes over 200 before the brakes have any trouble holding it.
