Any aftermarket 4 speeds?

My 727 blew up yesterday, gushing pink opaque trans fluid out the bottom of the bell house. That’s outside my scope of repairs, so I’ll have to get it rebuilt, or even replaced if it will be easier on me.

With all that being said, I have ALWAYS wanted a 4 speed. I’m wondering if there are any aftermarket 4 speeds available (similar to how TCI makes aftermarket 727s), and if so, are there conversion kits available?

Thanks in advance for any help here
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