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4L80E Add-On Harness
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If switching from a T56 (manual trans) to a 4L80E on your LS vehicle, this harness is what you need to make it work properly. Plugs into the new transmission and the other end is fully terminated and labeled for easy hook-up to your ECM connectors. Also includes ISS (input speed sensor) wiring. ECM reprogramming required for proper operation.
This is designed for use on vehicles using the 99 and newer LS1 style PCM in Camaros, Firebirds, and Trucks. It will not work with E40, E38, or E67 controllers.
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4L60E Add-On Harness
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If switching from a T56 (manual trans) to a 4L60E on your LS vehicle, this harness is what you need to make it work properly. Plugs into the new transmission and the other end is fully terminated and labeled for easy hook-up to your ECM connectors. ECM reprogramming required for proper operation.
This is designed for use on vehicles using the 99 and newer LS1 style PCM in Camaros, Firebirds, and Trucks. It will not work with E40, E38, or E67 controllers.
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4L60E to 4L80E Upgrade Harness
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If switching from a 4L60E to a 4L80E transmission, this is the adapter harness needed for correct operation of the new transmission. Includes adapter and ISS (input speed sensor) harness. ECM reprogramming required for proper operation.
If you're just needing the ISS pigtail only, please call us at 765-378-4908 to order.
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4L60E to 4L80E Upgrade Harness (Late Style)
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For 2007-2008 applications that have the input speed sensor built in to the transmission (15-pin connector). E38/T42 reprogramming required for proper operation.
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6L80 / 6L90 / 8L90 Gear Indicator
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Now available - The new gear indicator for swap projects using the 6L80, 6L90 or 8L90 transmission! Easily plugs into your existing OBD-2 port, or available with a quick connection to a new Speartech harness. This allows you to easily see what gear you're in when you're tap shifting with our tap shift switch box, or floor mounted tap shifter!
Now confirmed working for the 8L90 too! Works in factory applications. Just plug into your OBD port. Tested and confirmed functionality on a 2017 Sierra Denali 6.2 / 8L90 factory stock truck!
Available display colors: Red, Blue, Green, or Yellow.
The indicator measures 2" tall, 1.25" wide, .5" thick.
Note - Disconnect the gear indicator when doing any read/write functions (tuning) to the ECM/TCM.
Gear indicators are covered under a 12-month warranty from the date of purchase.
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