Brett_04Silverado

Swapping a 4L80E into a 2004 Silverado 1500 that used to have a 4L60E

The 4L60E had a boss on the driver's side of the transmission case for a bracket to secure the fuel lines. Not the clip at the bellhousing - this is further down above the shift mechanism. The 4L80E does not have this feature; looks like the 2500 fuel lines are completely different and attach to a bracket at the rear speed sensor.

For those who have done this swap - how did you secure the 1500 fuel lines? Not really comfortable letting them hang on the flexible section to the frame.

While the engine and transmission are out, I replaced the fuel lines with new stainless ones. The replacements have a GM quick connect flare where they come off the frame rail near the driver's door. Thinking maybe the easy way to handle this is with quick connect to AN adapters at the frame rail, then run braided stainless lines all the up to the engine over the transmission.