[Cal Metal]

I have had experience with both. I wouldn't equate the Muncie with the toploader, though, unless you have an M-22 with the 22 degree helix gears. Muncies are strong. Regarding the M-20 (wide), M-21 (close) beware of the '63 boxes. M-22 gearing is now available and runs about $800.00 which is cheap, as good original boxes are non existent. The Muncie is nothing more than a heavy duty version of the Warner T-10, as the gear layout is essentially the same, with reverse being located in the tailshaft. I would replace the input and mainshaft bearings, as well as the brass synchro rings as a minimum. Most of these boxes that were behind hi-po engine often need 2nd and 3rd, too. None of these boxes, TL or Muncie, will hold up over a sustained period of time if used for drag racing.