Re: look at this big sum\' bitch\'
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why do they only have one gear option? What is the gear?
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Rockwell only made the 2.5 axle with a 6.72 gear ratio. Apparently, there isn't much demand for different gear ratios either, because the aftermarket hasn't produced anything. There's aftermarket upgrade shafts, hubs, joints, etc. available, but no gears in different ratios.
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So THATS why no one runs then, when they are that cheap
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Plenty of people run them, but your vehicle needs to be set up correctly to support them. IIRC, they're significantly heavier than a D60 or 14FF, and require custom steering and brake setups ($$$$). Since it's a top-loading axle design, the pinions (and therefore the driveshafts) are well above the axle centerline. Great for ground clearance, but this can cause interference between the top of the axle and the engine oil pan and/or fuel tank. 2 ways around this: lift the truck high above the axles, or build the truck around the axles.