Planning a system, big 3 done, will I still need a bigger/another alt?

My silverado has a 105amp alt. My battery is an oreily super start exteme (rebadged deka) 955ca, 775cca, 120 RC. No additional batteries. The big 3 I did was in 0ga knu ofc, and actually there are 7 runs instead of 3. (- to block, - to chassis, -to frame, + to fuse box, + to alt, block to firewall, and I ran a bolt through the floor of the truck where I grounded my amp with 4ga wire then underneath the truck ran 0ga from that bolt to the frame) I think ive done everything I can possibly do without adding another alternator, replacing the one I have, or buying another battery.

The max draw of my system is 140 amps. The front stage amp (A/B amp 75x2@4ohms) fuse is 40, the bass amp (class H 750w@4ohms) fuse is 4x25. I didnt plan it this way, when i looked online at the specs the bass amp was only supposed to have 60amp draw total, but when i get the amp it has 4x25 (100amp) fuse. Everything is running at 4 ohms. At max draw 140amps @ 900w @ 4ohms total.

Is it likely ill need a new or another alternator?

I wouldnt think so. But honestly you never know till you try.

it wont draw that much you should be fine, if anything goes wrong try to upgrade your main battery first and then add a second battery. also very good on the thorough job you did with the big 3, you went up and beyond on everything!

You can get a 145 amp large case GM AD244 alt used on ebay for around $50-75. You want the 2003-2005 KG3 RPO code alts. You will like the extra 40 amps of current.
Alternator for A 03 04 Tahoe 145 Amp Opt KG3 | eBay
Your stock belt and tensioner may have enough slack, if not you just purchase a slightly longer belt.
I was running 2 of these with 4 deka batteries on 4 bb2400s and never dropping below 12 volts.

there's no way that system will draw 140 amps.

I'm guessing, with the aid of a wattage calculator, that the system on full volume will draw around 70A, give or take 10A, if a continuous sine wave was played. Given that music is dynamic, it is doubtful that around 70A will be drawn more than a second or two during the course of a song.

A system like that should NOT need a HO alternator, based on what I've learned so far on this forum.......

Running less than 1000 watts, you should be fine. If you have a voltage issue, the gain is either too high, or you have a wiring issue somewhere.

Thanks for the replies!