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The 4.8 is slow but I highly doubt its slower than a old tbi truck. When I got my 99 ecsb 5.3 it was completely stock and faster than my 91 ecsb 350 tbi with full boltons.
I can easily see a 2010 crew cab cab with a 4.8 and stock ECM tuning feeling slower than a TBI 350 truck. A TBI 350 truck has mondo low rpm torque that hits NOW. Something the newer stock trucks simply don't do.