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.