1. Part Number:

NP246 / 412-487 / RTC246G4 / 4L80
24228439, 12575942, 24233726, 24237190, 24237288
24238848, 24239525, 24240016, 12577835, 12580185
12580860, 12584881, 12585240, 12586467, 24238533

Input Shaft (Internal Spline): 32
Front Output: 32 (Internal Spline, one tooth missing)
Rear Output (External Spline): 32

2. Will Fit Following Models:

This is for the Electric Shift model.
Replacement for 2003-2007 GM Trucks with RPO code NP8. (32 spline input shaft 4L80 Transmission)
Replacement for Chevy Avalanche 2500 2003-2006
Replacement for Chevy Silverado 2500 2003-2004
Replacement for Chevy Suburban 2500 2003-2007
Replacement for GMC Sierra 2500 2003-2004
Replacement for GMC Yukon XL 2500 2003-2007