If both front speakers are not working, then either the fade control is set to rear speakers only, or the front speaker plug has fallen out - very unlikely. Check the fade control, first.
Or, I suppose a particularly loud blast of music could blow both speakers at once . . .
The ABS computer has detected a fault and is informing you that it's not working properly.
The most common cause of that is a bad EGR Valve.
fuse link
Blown speakers, bad wiring or radio problems.
Oil leak and overheating?
It might be that you did not tighten the gas cap enough.
not enough freon or too much
yes, also no fuel pump and maybe a blown fuse.
Owners of Chevy Silverado's choose to lower their trucks for aesthetic reasons. There are no real performance advantages to a lowered truck, and in fact, if a truck is lowered too much, it can cause problems when driving over uneven terrain.
if you have messed up the stiring wheel
Nothing last forever. Replace water pump it's worn out.
Yes it can cause erratic shifting. But not an engine miss fire. You need to find out why the engine is missing and running bad and when you fix that problem then I'm sure the transmission will start working and shifting correctly.