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4l60e no 2-3 upshift on wot or almost wot


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Jpeters
Novice

Jul 6, 2015, 11:58 AM

Post #1 of 8 (3726 views)
4l60e no 2-3 upshift on wot or almost wot Sign In

Just rebuilt the transmission. All other shifts are good. Sometimes 2-3 shift seems lazy or a bit delayed. Wot or close to it trans does not come out of 2nd. Release gas pedal and try again still no upshift until I give it a few seconds. I am thinking I may have a solenoid problem but unsure. No codes were set and it was scanned with 2 different scanners. I have not checked at wot with scan tool to see if upshift was commanded. I think something in vb but idk. I have rebuilt over a dozen of these so I do know something about them but not an expert.


gsferraro
Veteran

Jul 6, 2015, 4:39 PM

Post #2 of 8 (3709 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

Hello,
If you drive it normally how does it work? what year is this car? Some of these cars will not shift at w.o.t, you would have to back off on the gas pedal to make it shift. What was the orginal problem with the car. Gary


Jpeters
Novice

Jul 7, 2015, 4:54 AM

Post #3 of 8 (3701 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

Normal driving usually it will shift fine. But sometimes it gets a bit slow to go into 3rd and does not go into 3rd very firm. This is a 2000 sierra 4wd. This never happened before it was rebuilt. But I did use a different set of solenoids on it and maybe I have one that is bad.


gsferraro
Veteran

Jul 7, 2015, 1:21 PM

Post #4 of 8 (3689 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

What was the original problem that you overhauled the trans, as far as the shift solenoids that you installed, they were new? Gary


Jpeters
Novice

Jul 8, 2015, 5:29 AM

Post #5 of 8 (3678 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

The torque converter was going bad and rattling inside. Then started slipping some. The solenoids came off another tranny I was having a shift problem with. I swapped them out but the original problem was caused by another component failure. I don not believe they fixed the issue. Were the solenoids bad too? I dont know but could have been.


gsferraro
Veteran

Jul 8, 2015, 5:59 PM

Post #6 of 8 (3668 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

Its very possible you may have a sticky shift solenoid, does this problem happen more when the car is cold, or when hot, or at any time hot or cold. To make a 2-3 shift, the band gets released and the top clutch of the input drum comes on, that top clutch is called the 3-4 clutch, this is the weak point in this unit.Gary


Jpeters
Novice

Jul 9, 2015, 6:40 AM

Post #7 of 8 (3638 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

I think the problem is the same hot or cold. I am aware of the 3-4 clutch issues. In my opinion the factory clearance is too high. I believe there are different thickness plates for these. The other thing I can think of is that maybe a check ball fell out when I installed the VB , but I doubt it. I will pull the vb when I have a chance and go through the whole thing again , replace the solenoids and install a Sonnax boost regulator valve. I want a firmer shift than what I have especially in a truck.


gsferraro
Veteran

Jul 9, 2015, 6:08 PM

Post #8 of 8 (3627 views)
Re: 4l60e no 2-3 upshift on wot or almost wot Sign In

I keep my clearance at around .60, Let me know how it goes. Gary






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