Here is an Ebay auction for a rebuilt HEH-BX transmission by Ebay member "Kevin's Klassic Cars" with a Buy-It-Now of $2,500.00:
The Ford Top Loader HEH BX 65-66 289 & 289 Hipo Mustang 28 spline Close Ratio is a vintage manual transmission part manufactured in the United States by Ford. This performance part is designed specifically for Ford vehicles from the 1960s, offering a close ratio for improved efficiency and power transmission. With its unique 28 spline design, this top loader is a sought-after component for Mustang enthusiasts looking to enhance the performance of their vintage Ford vehicles.
Ford Top Loader HEH BX 65-66 289 & 289 Hipo Mustang 28 spline Close Ratio | eBay
-Fred-