4L60 Issue...
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4L60 Issue... Hello all -
I have a 4L60 in a 1998 Chevy G1500, custom van. Up until last week the tranny was shifting perfectly with no signs of an upcoming issue. My wife was going to back out of a parking spot on Friday and she says it made a high pitch whine and then wouldn't go into reverse. So she drove out straight through an alley and limped it home.
When she got it home, I got in and verified there was no reverse like she said and I also found it would jump 2nd and 3rd, right into the overdrive. And it would only go into overdrive if I got it past 20 mph and released the gas pedal. I thought that 2nd and 3rd clutches were gone and that I would verify that when trying to drive in those gears. I tested all four forward gears and they all worked just fine and did not slip, but it would still jump from 1st to OD.
I dropped the pan yesterday and to my surprise there were zero metal chunks or debris and very little "dust". So I replaced both shift solenoids, installed a new filter and filled it with new fluid. After I let it warm up for 20 - 30 minutes to ensure the fluid was completely pushed through the new filter I drove it around the block and it sill has no reverse and skips from 1st to OD.
I know in my heart that it has probably failed internally, but I'm wondering if there might be something that I may be missing to check? I even checked the tranny fuse in the fuse box. I drove it the day before all of this happened and there were zero symptoms that this was coming like slipping, noise or not shifting.
Am I pipe dreaming or is there something else I can do or in the opinion of the pro's here, has the old lady actually gave up the ghost?
Thanks for the input.
Steve D
USN Retired...
I have a 4L60 in a 1998 Chevy G1500, custom van. Up until last week the tranny was shifting perfectly with no signs of an upcoming issue. My wife was going to back out of a parking spot on Friday and she says it made a high pitch whine and then wouldn't go into reverse. So she drove out straight through an alley and limped it home.
When she got it home, I got in and verified there was no reverse like she said and I also found it would jump 2nd and 3rd, right into the overdrive. And it would only go into overdrive if I got it past 20 mph and released the gas pedal. I thought that 2nd and 3rd clutches were gone and that I would verify that when trying to drive in those gears. I tested all four forward gears and they all worked just fine and did not slip, but it would still jump from 1st to OD.
I dropped the pan yesterday and to my surprise there were zero metal chunks or debris and very little "dust". So I replaced both shift solenoids, installed a new filter and filled it with new fluid. After I let it warm up for 20 - 30 minutes to ensure the fluid was completely pushed through the new filter I drove it around the block and it sill has no reverse and skips from 1st to OD.
I know in my heart that it has probably failed internally, but I'm wondering if there might be something that I may be missing to check? I even checked the tranny fuse in the fuse box. I drove it the day before all of this happened and there were zero symptoms that this was coming like slipping, noise or not shifting.
Am I pipe dreaming or is there something else I can do or in the opinion of the pro's here, has the old lady actually gave up the ghost?
Thanks for the input.
Steve D
USN Retired...
TECH Junkie
Joined: Dec 2012
Posts: 3,621
Likes: 1,335
From: Iowa
Agree with this. It can be hard to tell if it skips to 3rd or 4th. I'm betting you have 1st and 3rd only.
