[Anthony]

The early 427 cobra's came with a abig in-small out toploader.

It's an easy swap to change the input to the large input with the big front bearing retainer, a coupkle hundred dollars.

I'm not sure if the 25 spline output has the same bushing and tailshaft diameter as the 28 spline, but if it does, it's an easy swap assuming you're rebuilding your tranny.

If you want to go the big out, you'll need either a different tailshaft housing, or bore out the one you have for the bigger bushing, in addition to the bigger mainshaft.

I think the weakest part is the input, assumiung you're using a 28 spline oputput. I'd change to the big input first, and then the big out if you want it.

In general, you want the 24" length tranny, not the 25 1/2 or 27" versions.

If you're going to rebuild the tranny yourself, buying the parts yourself, then you may save some money. If you are going to pay someine to rebuild it,then you're better off buying the tranny from David Kee or Markl at toploader heaven.