FedEx Next Day is VERY reliable, but you'll pay for it. I'm thinking that the valve body is about 16 pounds, and the box will end up being about 18x12x8. With an insured value of $600, then your FedEx choices will be (see the rates at fedex.com
- First Overnight (8am delivery), $123
- Priority (10:30am), $95
- Standard (3pm), $83
- 2 Day (4:30pm in 2 days), $57
Don't forget that you'll need to spend that money twice - once out and once back.
Time wise, I'd bet that you'll be closer to 3 hours including the time to drain the tranny, pull the VB, let it drip, wipe it down, pull the springs (pack 'em separately!), pack it in a box, get it to FedEx, etc.
Oh! One HUGE thing... You'll want to call John and make sure that he's not backed up and can get to it immediately!