kernel 2.4.* and sound

I uprgraded my 2.2.19 kernel to 2.4.2. Doing so, the sound module that was finely detected with the lower kernel was not recognised by the new kernel. Even by using sndconfig, no sound module could be found. I looked in the /lib/modules/2.4.2 and the module was listed there, the same name as the module for the previous kernel in /lib/modules/2.2.19

What do I have to do so the new kernel will look for these modules automatically?
I did all the make process: make install, make modules_install, make dep and so on. Maybe I forgot something that was not indicated in the HOW-TO for the kenel modules.
Thank for your help.