I was surfing through the web & came across the product 'news' release for a new 5spd from Richmond. Stats were 600# torque capacity, 2.89 1st gear, .77 5th gear, & better (stronger/bigger) internals.
http://www.richmondgear.com/NEW5withOD.html
I googled Summit Racing & they list them in their catalog so I guess they've been around for a bit. Anyone have any other info about these?