first off an FGC model number is a mitsubitshi model number
a cat model of the same truck would be just a GC.
but according to the parts manual the battery supplied from the factory is 410CCA or a 460CCA rating. The newest superceeded part number shows being a 460CCA rated battery. it shows as a description: Battery BCI 45 460CCA
so that would be a group 45 (460CCA)
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