Won’t matter.
The only differences I’ve seen in the research I’ve done on the 4500 is that some versions have like a 6.81:1 first gear ratio and other have a 5.75:1.
Majority of the ones out there have 5.75:1. and no you don’t need one with the higher ratio.
With the 4500 you only use first with a load on and going up hill on these trucks.
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