Has anyone ever seen a Sony, Kenwood, or what ever head unit that has 4 channel aux input. I have my 76 jeep cj-5 with 2 mtx amps which is fine but I have an extra sled for my 99 ford f250 superduty and I do not really want to tear it apart. The ford stock unit is almost double din size. Maby I'm just nuts but no harm in asking. Thanks

Never seen anything like that, but let me tell you what I did.
My JVC head unit has a aux 1/8" connector on front and a changer control on the back. There is an adapter you can get that turns the changer connector into a standard Dual RCA input.

I suppose you could use the aux connector for 1 input and the changer for the other, which might do what you want.

I can't remember why, but the changer adapter would not work with my head unit, so I ended up tearing it apart and soldering the front aux connector to a 1/2" female adpater, which hangs out the back of my head unit.

Anyway, it's a long shot, but something to look for. My HU isn't made anymore, but I think any of them that can control a changer and have an AUX in would do it.

Why do you need a 4 channel aux input in the first place?

Long live the the CJ-5! I went through High School in a 74....