can you extract what rear end ratio is on my truck via the serial number 2gtek19r2w1528269

RPO sticker in the glove box GK9 4.63 Ratio GT4 3.73 Ratio GT5 4.10 Ratio GU4 3.08 Ratio GU6 3.42 Ratio HC4 4.56 Ratio

GM RPO Codes – Factory Identification Labels and Interpretation GM RPO Codes, or General Motors “Regular Production Option” codes contain lots of valuable information about your GM vehicle. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified) The prefix is usually F, G or H when referring to Axle Identification.