Thanks to everyone
Thread Starter
Teching In
Joined: Dec 2015
Posts: 44
Likes: 0
From: Near E-Town
Thanks to everyone Hello Everyone,
This is a quick thread to thank everyone who has posted about a 1-2 shift/flare problem with the 4L60E. Thanks to these posts, I have fixed my problem for the least amount of money, and my truck shifts like it should.
Thank you from the bottom of my wallet
Steve
This is a quick thread to thank everyone who has posted about a 1-2 shift/flare problem with the 4L60E. Thanks to these posts, I have fixed my problem for the least amount of money, and my truck shifts like it should.
Thank you from the bottom of my wallet
Steve
Thread Starter
Teching In
Joined: Dec 2015
Posts: 44
Likes: 0
From: Near E-Town
Problem: Previous owner didn't drive the truck. I bought it in August with 8300 miles, and now it has 13100. It sat and had nothing done to it as far as I can tell. Upon purchase it shifted fine, but not like my 96 Impala SS. I thought this was due to torque management on the newer trans. I was wrong.
Fast forward to November/December time frame. My truck flares/slips from 1-2 so bad that it goes right into 3rd. All gears are there, but 2nd is not engaging like it should. 3-4 shift is fine, as is the kick down into 1st or 3rd, but not 2nd since it just flares/slips.
I read and read, and read some more. So I decided to spend a few bucks and see if I can fix it. First I replaced the throttle position sensor ($34). All that did was make my truck idle better and feel smoother. I got AC Delco shift solenoids installed, both 1-2 and 2-3 since they were both $11 each. The Sonnax pinless forward accumulator ($15) also went in during that service since I read the factory plastic ones can crack. Fluid was perfect and nothing in the pan or filter. New filter and fluid.
That didn't work. So I got the Sonnax Billet 2/4 servos ($171). That is what solved my problem. I'm guessing that the pin might have been too short, or there was a bad o-ring on the factory servo. The truck shifts extremely nice now. I also had random rpm hiccups when I was cruising on the highway. I heard that can be caused by a faulty torque converter lock up solenoid, which is tied into the 2-4 servo, or at least I think that is what I read. All the hydraulic diagrams for this transmission can cause blindness.
Anyways, that the story. It shifts great now and I am very happy. This forum saved my Christmas by getting my truck back in action.
Fast forward to November/December time frame. My truck flares/slips from 1-2 so bad that it goes right into 3rd. All gears are there, but 2nd is not engaging like it should. 3-4 shift is fine, as is the kick down into 1st or 3rd, but not 2nd since it just flares/slips.
I read and read, and read some more. So I decided to spend a few bucks and see if I can fix it. First I replaced the throttle position sensor ($34). All that did was make my truck idle better and feel smoother. I got AC Delco shift solenoids installed, both 1-2 and 2-3 since they were both $11 each. The Sonnax pinless forward accumulator ($15) also went in during that service since I read the factory plastic ones can crack. Fluid was perfect and nothing in the pan or filter. New filter and fluid.
That didn't work. So I got the Sonnax Billet 2/4 servos ($171). That is what solved my problem. I'm guessing that the pin might have been too short, or there was a bad o-ring on the factory servo. The truck shifts extremely nice now. I also had random rpm hiccups when I was cruising on the highway. I heard that can be caused by a faulty torque converter lock up solenoid, which is tied into the 2-4 servo, or at least I think that is what I read. All the hydraulic diagrams for this transmission can cause blindness.
Anyways, that the story. It shifts great now and I am very happy. This forum saved my Christmas by getting my truck back in action.
