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what is the model of the transmission on 4x4 w/5.3 v-8
It could be either a 4L60-E or a 4L80-E.
You can call any GM dealership with the VIN# and they should be able to tell you, or lift up the truck and check the ID tag on the side of the transmission.
Q&A > Chevrolet > 2001 Chevrolet Tahoe