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Originally Posted by FUNFER2
I would never use a IRS for the drags, they were not made for that application. Good ole 9". Wheel hop can happen with any rear end, any car, most of the problems comes with setting up the suspension. Sometimes a simple shock change will correct the problem.
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I don't think I've ever seen an ERA with a Ford 9". If you were building a dedicated drag car, ERA probably wouldn't be the best choice. An FFR might be better. Here's what the ERA site says about the Ford 9" on the FAQ.
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How about the Ford 9" differential?
There are several reasons that the 9" isn't the best choice. The unit is not interchangeable with the Salisbury in our subframe and would require aftermarket calipers and a very Rube Goldberg emergency brake. Also, the pinion offset is about 1.5" lower than the Salisbury, making the driveshaft angle down excessively. Since the nine-inch wasn't designed for an IRS halfshaft, the conversions are quite expensive too.
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