Good to have you here. Over the next several weeks I'm going to walk you through everything that matters on Silverado 1500 transmissions — specifically the 6L80E paired with the 6.0L, and the 4L60E behind the 5.3L. These are two very different units with very different failure modes, and the shops that struggle with them usually confuse the two. Let's start with what kills these transmissions most often, because the pattern is consistent.
Recommended Products
Sonnax 77754-01K — 6L80E Pressure Control Solenoid Kit
If you're opening a 6L80E with a 1-2 slip complaint, swap the PC-A solenoid before buttoning it up — this kit includes the updated valve body bore sleeve to go with it.
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