Original Saturn Automatic Transmission

Dear GMi colleagues:

My brother keeps insisting that the original Saturn automatic transmission, as used on the SL, SC and SW models, was sourced from Honda.

I don't believe this to be true. My recollection was that it was a unique product supplied by GM's Hydramatic Division, and that it included an unusual, for Hydramatic, spin-on ATF filter.

But I cannot positively refute my brother's claims of Honda parentage. I've googled extensively to no avail, excepting to confirm that a Honda AT was mated to the Honda V6 optional in the first gen Vue.

Any help that you - now paging GMCSonoma - can offer me in clarifying the supplier of the original Saturn automatic will be truly appreciated.

Thanks,