Converts the transmission wiring from a 4L60e to a 4L80e.
Easy PnP installation.
PCM programming required.
GMT800 and GMT900 platforms require a specific harness. If your truck style is similar to a 2005 GM Truck then choose GMT800.
If your truck is similar to a 2008 GM Truck then choose GMT900.
Our GMT900 harness only works on transmissions with an external PRDL switch. You can determine this by looking at the shifter linkage. If it has a connector/switch n the shift lever then it has an external PRDL.