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Chris here we go again. What are you going to do with the car? How much power are you putting under the hood? Trans mission? I jag rear will take about 450hp ERA makes stronger half shafts for there rearends. Chromemoly tubing. If you are going for 600hp go to 30 spline stub shafts, Mark Williams makes them, Detroit locker for the rear and a rear cover gridle to help the caps stay in place. Tires? what size are you running and how soft? No rear is going to last with 5000 rpm hole shots. There are cars with 800 hp out there and the rears hold up OK but are check on a regular maintainance check. Change the fluid and look for metal chips. 9" rear is stronger with ahousing support welded to the back. 35-40 spline axles can be gotten. Larger bearings can take more stress. Have you looked into a quick change rear like a Franklin that dirt track drivers use? This has a 9" ring and pininion, IRS setup for better handling and is good for 750hp. Fill in the blanks and we will see what we can do. Gear ratio? Rick Lake ps I bring a spare jag rear when I race, trans too. Have not needed either yet.
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