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Message: [QUOTE="FrankTheTank, post: 621704, member: 3401"] Sterling 10.25 = 31spline pinion shaft and 35spline axle shafts on ALL trucks. 10.25" ring gear Sterling 10.50 99-2010.5 = 31 spline input shaft with smaller pinion bearing. 35 spline axle shafts and 10.5" ring gear. U can take the 10.25 ring and pinion and install it on the 10.5 and use the larger "earlier" pinion bearing and then use the added clearance from the 10.25 ring on the 10.5 housing to use sholdered ring bolts from a dana 80 which makes the 10.25 stronger then the stock 10.5 as that was the weakness on the older axle to make a hybrid axle if u will. Sterling 10.5 2010.5-now = 37 spline pinion shaft with 35spline axle shafts with available open or e-locker. This is on all f250 models and some 350 models in SRW but not sure how many Sterling 10.50 2010.5 - now = 37 spline pinion shafts with 37 spline axle shafts which are .15" bigger (if my memory is right) avaiable with open or e-locker on some f350 models with upgraded gvw capicaty for towing but not sure what that number is. [/QUOTE]

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