C1500 Shift Lag

[Jared Stangenberg]

My 92 C1500 (5.7L, 4L60) is experiencing what I would describe as "shift lag" in first and sometimes second gear.

Instead of shifting around 3000 rpm like I would be expecting, the truck is pretty much going to redline before shifting. Sometimes it will shift on time if I help things out by taking my foot off and back on the gas at the appropriate shift point. I had read that the throttle position sensor could be culprit and since it seemed the easiest thing to do, I replaced that. While the truck seems to run a touch better at idle with the new sensor, it doesn't seem to have helped the shift problem at all. What else is worth investigating for this issue?

[00Silverado4x4]

Just from what I've read here it sounds like you are going to need the trans dropped and inspected internally. I don't think you are looking at a simple fix on this one. Sorry.