alright, after much searching. i have finally installed the gingerbread 2.34 with mosiac rom. thanks crimson for the help
If anyone cares. i did a detail copy and paste instructions on what i did. and also added some more info .
Ok i am now on gingerbread (mosaic) 2.34
Here’s what i did, I list the forums I got the info from just to show where I got my info. So you shouldn’t have to go to the forums unless  (you cannot download the files)
First: - get back to eclair 2.1 (Register a Forum account)
[How-To] Backup and Factory Restore Samsung Captivate - Android Forums
Follow these instructions
1. Download Odin One-click Application HERE and unzip it. You'll need the .exe file (Make sure you run Odin in (Run As Administrator), to do this just right click the program).Every time you run Odin throughout this install you Run As Administrator
2. Disable any running antivirus (causes an interrupt during process resulting in bad flash)
3. Make sure to plug USB cable in the back of the computer, for most reliable connection (if using a desktop).
4. If your phone is plugged into your computer, unplug it now.
5. If your phone is not powered down, power it down now.
6. Launch ODIN on PC.
7. Remove battery, SIM, and micro SD from phone.
8. Re-insert the Battery. Boot into download mode by holding both Volume buttons and plugging in the USB. If you get a screen that says "downloading: do not turn off target" with a digging android, you're in download mode.
9. Your phone should show up in ODIN (the box will turn yellow w/ letters and numbers).
10. Click START, and let it finish.
WARNING:
DO NOT UNPLUG YOUR PHONE UNTIL IT FULLY BOOTS.
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Second:
http://androidforums.com/captivate-all-things-root/120616-captivate-root.html (Register a Forum Account)
YOU WILL NOT LOSE ANY SETTINGS OR DATA DOING THIS*
Download the following zip file and rename it to update.zip (Rename it to UPDATE, do not put .zip your phone will do that)
Step 1. Connect your phone to your computer and copy the renamed update.zip to the root of your internal memory
Step 2. Unhook phone from USB; Turn the phone off after file transfer is complete
Step 3. Hold both Volume Up and Volume Down while powering on the device to enter the recovery menu (note: let go of the power button after seeing initial boot screen, otherwise it'll continue to power cycle)
Step 4. Select Reinstall Packages from the recovery menu using Volume Up and Down to navigate, and Power to select
Step 5. Phone will automatically reboot, and you will have root privileges, and the Super user program installed.
Third:
{2.3.4 ROM} Mosaic VI {Team Phoenix}{7/30/2011} - xda-developers Download the mosaic rom onto your desktop Do not unzip
ROM DOWNLOAD:
Mosaic VI:
• Mirror 1