RPMs not getting up to 1,500 unless I go 60 plus MPH?

Hey guys/gals. I have the truck listed above LD. I have aftermarket taillights, light bar, a Borla Atak exhaust, an aftermarket subwoofer system, and rims are tires. My RPMs will not get up to 1,500, unless I am going 60-usually 65 mph. I know rims and tires can throw that off. But I've had a board full of weird things going on with the vehicle. My transmission sometimes does not shift at all what soever unless I let my foot off the gas and force it. Sometimes I will be driving 30 mp and RPMs stuck at 2,000. Sometimes I get up to 55 and they're only running at around 1,400 or around there. Sometimes my battery shows about a 11/12 out of 14 charge. Sometimes when I let my truck sit for a couple hours. My transmission fluid stayed above a hundred degrees. Sometimes also when I start the truck, instead of the truck recharging like it's supposed to. The battery ends up starting and staying at 10/11 range and it makes my truck run badly. These are just a few of the issues but can anyone give me some guidance? Thanks