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One external wiring harness for a GMC/Chevy 4L80E transmission...
This is an external wiring harness for the GMC/Chevrolet 4L80E transmissions. This is a stock # TEC 34986 kit for a 4L80E automatic overdrive transmission, which goes in several Chevrolet/GMC truck (RWD and 4x4) from 1991-up. You know you have a 4L80E because it has 17 pan bolts. This harness is used in 1994-up 4L80E's, but can also be used in 1991-93 to update the wiring (just need to change to the 94-up internal wiring harness which is also available in our store - P/N 34985 for 94-03, or 34985A for 2004-up) This harness is easy to install without removing the transmission and saves a ton of time and money over buying from the dealer.