Promise fasttrack raid, changed disk, unable to boot.

Hello,
For the previos year i have been using the promise fasttrack 100 to controll 4 disks. I mirrored 2 75gig drives and 2 80gig drives. Recently one of the 75 gig drives died on me. This particular mirroring array was the system array. So i replaced the disk with an 80 gig one and duplicated it. Now i an unable to boot with the previos kernel 2.4.19. But i can boot with the 2.4.18 kernel which was provided to be by my distrabution. I have comiled 2.4.19 and 2.4.20 on the machine itself and another machine to see if i could get one of them to work, but i can not. During boot up something like this is listed

ataraid/d0 then the partitions are listed. such as ataraid/d0p1 then the drives are listed
drive0 is 733XXX mb
raid0 consists of 1 drive.

That is how it looks with the new disk plugged in. But if i unplug it. it will look like this:

drive0 is 733xxx mb
drive1 is 733xxx mb <--- this tells me that there is something either in the kernel or in the system that is telling the kernel what the old disk used to be.

I am completly lost and hope that someone else has an idea of what i should do. BTW I have compiled my kernel statically, while the distos 2.4.18 was modules, if that makes any difference.

Thank you,
Paul