I'm in the process of pulling the OEM stereo out of my newly purchased '08 4Runner Limited and would love to sell the old JBL amp to defray some of the new equipment cost. My '08 amp is part number 86280-0W430. Will this work in your 2004.

Rodney

At the beginning of the pandemic, I thought I'd upgrade the head unit as a weekend project. Went with a Kenwood DNR876S and PowerBass 2-ohm 6.5" speakers for the front & rear doors. All from Crutchfield along with their harness and install kits. Very helpful company. Left everything else OEM and it really sounded about 100x better, not to mention the improved functionality of Apple CarPlay.

Lately, I've been getting a horrendous screeching sound with either the radio, streaming from my phone or trying to make a phone call. I spoke with Crutchfield and they think it is the OEM amp failing.

Ideally, I'd like to just unplug the old amp and plug in a new one. Is there a source for new ones? I've found some folks who will rebuild the old one, which seems like a straightforward way to go. Maybe I can find a decent condition used one that someone here removed from their car?

It looks like I'd need an 8 channel amp if I went aftermarket, but I'm not too interested in taking out the head unit again. Is there anyway to use an aftermarket amp without having to run new wires throughout the whole vehicle?

Might as well replace the subwoofer while I'm in there, right? Anyone successfully running a new sub off the OEM amp?
Edit: plenty of folks in this thread running a new sub on the OEM amp
JBL Sub Replacement

I am replacing my OEM amp with aftermarket amp. Let me know if you want the OEM amp.

Thank you, but turned out my problem was the headunit.