The older 6.0 gasser with 4L80 tranny came stock with the 3.73s which is RPO code GT4. 4.10s were an order option with RPO code GT5. The 4.10s came stock with the 8:1 though.
I have a 2004 2500 6.0 gasser with the 3.73s.
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2014 V-Cross Platinum 365VTSB (Bought Labor Day 2014)
TV: 2016 GMC 3500 Denali - Motor Ops Tuned
Days Camped 2016: 28
Days Camped 2017: 25 so far
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