MBP will not access n on TC Dual Band. Firmware 7.4.1 doesn't work either.

So maybe I'm missing something.
I have the Time Capsule dual band. Brand new. An Apple Care replacement of my original Time Capsule (non dual band). 1 TB versions.
Replaced because I can't access the 5ghz band from my MacBook Pro.
MacBook Pro 15"
Model Identifier: MacBookPro2,2
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Wireless Card Type: AirPort Extreme (0x168C, 0x87)
Wireless Card Locale: USA
Wireless Card Firmware Version: 1.4.8.3
Current Wireless Network: xxxx
Wireless Channel: 11
I currently have the TC set with Radio Mode 802.11a/n-802.11g only. My MBP will only join the g side. I know this because holding down the Option key and looking at the Airport Menu icon shows I'm on channel 11 at Transmit Rate of 54.
In Airport Utility under Airport/Wireless/Wireless Options I have also allow the 5ghz network name to be shown.
I my Airport Menu if I select this 5ghz network I'm asked for the password. I type in the password and get connection timed out. All the time.
Now the interesting part:
The TC has firmware 7.4. If I upgrade it to 7.4.1 my computer will not even see the Time Capsule at all. I have to do a hard restart of the TC and immediately downgrade the Firmware back to 7.4.
Interesting part number two is:
I have an original Airport Extreme. The first release of the n Airport. If I try and use this unit at 5ghz also, my MBP will get the same Connection Timeout. But the MBP will work on n band at 2.4ghz. BThis running firmware 7.3.6 ( I think that is it). IF I upgrade this unit to 7.4.1? Again I will not even be able to see the Airport on my MBP. Again I have to down grade the unit to 7.3.6 after a hard restart.
So for me the 7.4.1 update is not workable. And Apple replaced my original TC twice with the same results. I returned them and they sent me the newest TC. And as stated above, the same results.
So 7.4.1 doesn't work at all for me.
5ghz n band doesn't work for me.
Any ideas? I'm assuming my Airport Card in the MBP is defective at this stage. It can't access 5ghz, And working on sending out the computer for check up to Apple. Or a Genius Bar visit.
Anyone else having n access on their computers? And the 7.4.1 Firmware?

Update to my post above- this is SO weird
If I manually select channel 40 on the 5ghz band, I can access 5ghz. I do not get the Connection Timeout. I on it right now.
Before I manually selected channel 40 the TC was in channel 149.
Does this mean anything? Now I'm not sure if the Airport Card in my MBP is defective or not.

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