Okay had a 603 reciever go out have a extra 604 from my 4pk so I need to know if it will work with the 3pk so my son can use his radio and not mine

604 is C2 version , cannot work with 3pk (C1 version).

Thank you fasst that's what I was looking for.
If you know should I bother sending it back to have it repaired or buy another one cost wise?

I don't know what the deal is with the 2.4 rcvrs, but the FM PCM rcvrs I've had repaired were on a set fee type deal and it was a no brainer, $25 against the cost of a new one for $85-90. Thsi has been years ago and the wait may now be a factor too, I had mine back in a few weeks back then.

Its worth a call/email to check out, then you'll know what you should do -

E-mail: [email protected]
Web Site: http://www.futaba-rc.com/
Phone: 217-398-8970

thank you duster i will email them your the man thanks again