Well if it's an 07, as the poster clearly indicates, it's not a TC88 but rathera TC96.Thatmodel holds exactly 32 ounces in the primary. And that's what it says in the service and owners manual. Not 26 or 28 ounces...

 

I believe that one of the reasons that the 07's and the 96 inch engines take 32 oz is because they redesigned the primary for the auto adjuster. If you look closely at thedarby cover it is actually slightly higher up on the outer case than on pre 07primary's.
Its easy to see after you open the cover up. On older ones the clutch basket aligns with the hole. Makes servicing the clutch easy. But on 07's the clutch basket is actuallybelow the hole.
On oldermodels putting too much oil in is actually kind of hard because with thehole positioned where it is it just won't hold it with the cover off, and the same is true of the newer 07's. With the hole higher it makes it easy to get the required quart of oil in without it spilling out on you.

 

I installed the new outer primary cover. Installation was easy and I used a entire quart of oil.