At what point to go Dana 60 ??????

I am in the boat.
I narrowed an 8 3/4 bought Moser axles and rebuilt the rear.
I blew a suregrip up and had to replace. (Didnt think it was the rear and thought it was the trans)
I bought a passon hemi overdrive to fix the trans issue.
Buttoned everything up and then found the broken nitro suregrip.
I used my spare chunk with 4.30s and put that in till I get another suregrip.

However this is when my brain goes "duh"
I picked up a dana 60 and I narrowed it.
It has 4.10 gears but needs a suregrip. (Currently open)
If the 8 3/4 ever gives me anymore issues it is coming out and the 60 is going in

I do like being able to change gears in an hour.
I push about 450-500 ft-lbs with 325 50 15 drag radials and all street miles with heavy clutch tests