ORIGINAL: siuhunter
Thanks for the responces. I have a channel 34 Futaba FB-T4NBL transmitter w/ an extra Rx crystal and saw a used reciever at a good price with a channel 40 crystal in it. I was just hoping I could change them out. By what Carrol said, it seems I can, it's just not the most recommended for optimal signal reception.
I would try it without hesitation. You can hook everything up and do a preliminary range check without installing it in a model.