As usual, I put in D, it took off in 1st as normal, I let off the gas at about 2-3k rpms and it shifted smoothly into 3rd gear, once up to speed, it went into 4th and all was good. The other day, I had to go on a 100 mile drive. Again, money and time were tight, so I drove it like that for a few days but only on short trips (5-10 miles). I never once felt or heard a slip in 1, 3, D, or R, there were no slips, no leaks, no smell, no shudder, no noise, no flare. After some test driving, I found that if I put it in D, then got the rpms up to about 2-3k in 1st gear, and let all the way off the gas, that it would simply skip over second and go straight to 3rd and then on to 4th as normal. Same when I manually put it in 3rd and D. I tried it manually and it would not go into 2nd, it just stayed in first. The 2-3 "miss" didn’t seem to change or get worse, but a couple weeks ago, I got in my truck to go somewhere and it wouldn’t shift out of first gear. I continued to drive it, taking it easy, as time and money were tight. I checked the fluid level, color, smell, and all were good. It didn’t feel like a slip and it was barely even noticeable. The MIL came on again a few weeks later but the truck drove fine so I just let it stay on.Ī few months ago, I started to notice a very slight "miss" at the very top of 2nd gear, right before it would shift into 3rd. I drove it and didn’t have the problem after that. They said to drive it and bring it back if it did it again. They cleared the codes and told me that these codes were common when the ignition switch was going out but they couldn’t be sure unless it was acting up during their inspection. They scanned it and I got P0740, 18 codes. I took it to a GM dealer but it wouldn’t act up for them. It later did it again off and on for about 6 months and the MIL came on. Put it back together and truck drove fine for a while. I changed fluid and filter and pulled and checked solenoids and they were fine. A few years ago, it would randomly go into limp mode and would only take off in 3rd. I have a 2003 Avalanche with 200k miles and a stock engine and trans. I know this is a forum for LS1's but from what I have seen, you guys know the 4L60E inside and out. Hi All, I'm not trying to hijack this thread but the title of "4l60E Problem" seems a good place to start. Please register or login to enable Dark Mode.Hot Rod Power Tour/ Pump Gas Drags/ Drag Week.Gen 5 Camaro Tuning, Diagnostics, Dyno results.
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