Will a Stock 489 handle 700hp?

70DusterBob said
I have about a 650hp 408 H.P. that has a H.P. 727 behind it 2,500 stall. It is time to put a diff in. Some people are telling me a stock 489 8.75, with stock gears, race axles, stock pinion yoke, stock bearings, etc, will handle 700hp with an Automatic Trans.

Some people are telling me I need this pumpkin for it:

Mopar 8 3/4" (8.75) 489 Case Third Member

I want the green bearings, a 3:23 ratio, 6 Helical Gear Sure Track II, w/a 1350 Yoke.

Problem is I can get a stock pumpkin for $850, while the race pumpkin with the above features is $1,425. Don't get me wrong, I am not out to pinch penny. What I don't want to do is spend the money on a race pumpkin when a stock one will do. If the stock will not do, I will definitely buy the race pumpkin. No Problemo! I have heard a lot of different answers.

Members who have experimented in this area will prove most helpful. I need to know what your experience was.

Pricey.. yea, but, for me I was the “EZ Button.” My garage is jammed! 3.55’s behind a 450hp 360. It’ll live forever on the street or track. 700hp? I hope not at the hit! A rear will live longer the lighter the car is. If your car isn’t super light the torque will eat up the rear.

If the rates lower is at the big end, and the car is very light, I can see a season or two on the track.

toolmanmike said
Strange S60

Oh yea! This would be the way.

j par said
As a side note I had $1,200 total into my 8 3/4 that blew up and $1,200 total into the Dana 60 that now reside underneath the Duster..

I hear this a lot. It’s a catch 22 on cost. Ether or....