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Do you need to replace both caps? If not which one do you replace? I bought 2 caps. Now I have heard you only need to replace one of them. What should I do since I already have two replacements? Jim

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The left side(drivers side) is usually the one that breaks, we put two of the Summer Bros. steel caps on a 8 3/4 340 4 speed Duster years ago, it ended up exploding the early clutch style posi later in that year A piece of the posi case went through the back of the housing and puncture the gas tank, it looked like a hand grenade exploded inside the posi Luckily it was on the starting line and no fire occurred He put a Dana 60 in it with 5.57 gears, ladder bars, mini tubs and bigger tires after that, no more problems, ever I have put one M.W. steel cap on the drivers side on several third members I had in my Duster, they flat worked Your choice, put both on now or save one for later