APPLICATION: 2007 - 2008 LM5/LMG 5.3 SILVERADO, SIERRA, SUBURBAN, YUKON, EXPRESS VAN ENGINES WITH WITH 4L60E (2007 OR NEW 4L60E REQUIRED) OR 4L80E AUTOMATIC TRANSMISSIONS. PARTS INCLUDED: Complete engine and transmission wiring harness, Instruction Manual NOTES: These harnesses are designed for retrofitting '07 - '08 5.3 engines and 4L60E or 4L80E transmissions into older muscle cars and
The original wiring diagrams show a "4-3 Downshift Switch" that on my transmission was a normally closed switch. The shop manual does not speak to this, but based on the wiring and what details I can find, it seems to indicate that this switch opens during the 4-3 downshift, and thus unlocks the TCC in this case.
Official Site of Painless Performance, American Made wiring harnesses for your hot rod, street rod, muscle car, off-road and everything in between. Wire it once and wire it right with Painless.
4L60E 4L60 GM Transmission Internal Wire Harness 2003-2005, Free Shipping on Transmission Internal Wire Harness. Visit PTPTrans.com
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Wiring diagram for 4L60E transmission: Jamie Lipsett: 3-12-08 : Wires got torn off going to transmission. I have to rewire transmission from controller, If you have any wiring diagrams for transmission could you please email them or let me know please.