I went the direction of adding a MW steel cap on my 8-3/4 a couple of years ago. Be aware, as Mike noted above, that they are not a bolt on. They need to be machined to fit your pig, and that process cost me more than the cap did. It's notable that on the nodular Iron units, they upgrade to steel caps from the get-go.

I don't throw a lot of power at mine, but I do hit it with a lot of weight (3800+). I see a lot of 10-second cars running them, and believe they can be a decent option if we'll prepped. I'm of the belief that a 742 8-3/4 with a back-brace, spool, steel caps, and good axles is more durable than many here will have you believe.