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Do you have the upgraded (dealer option) JBL system in your truck? If so then your Infinity speakers sounded weak because the factory JBL amp runs at 1ohm-stereo or 2ohm-stereo. The speakers you installed were probably 4ohm (most common) and they were only getting 1/2 or even 1/4 the power your factory speakers were getting.
Without a DMM I wouldn't know what ohm load your factory JBL system runs at, but if you are lucky enough to find out it is a 2ohm setup go get you the Infinity Kappa, or look into Image Dynamics. Both offer 2ohm versions of their current speaker lineup.
If you don't have the factory JBL setup then ignore everything I just said.
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