Quote from: shelbydoug on January 21, 2024, 09:41:32 AMDoug - I think 68stangcjfb is looking for a WIDE ratio big spline top loader, which of course Ford never made.
I honestly think you would be better off just swapping for the right BB transmission but the place to look for parts if you insist would be at https://4speedtoploaders.com/store/4speedparts.html.
David Key has reproduced many if not all parts for the Ford T&C transmissions.
68stangcjfb - I made my big spline, WR top loader by taking a donner WR input and having the gear welded to a big spline input shaft by Liberty Gears (https://libertysgears.com). It worked great and I'd still be using it if I hadn't switched to a Tremec TKO-600 to get a 5th gear and increased torque capacity (my 427 make 522 lb-ft of torque). Best of luck with your project.