Hi if yor replacing the bearing, and by the look of them its a yes, then I would just remove the cage and rollers then cut a slot in the cone the split it with a cold chisel, to get them off, I have just done a 57 year old Morris Minor Diff , to replace them I put the pinon in the freezer for 24 hours, and wormed the new cone and rollers in a warm oven for an hour not to hot, and what I thought was going to be a nightmare, was easy the new bearing just dropped all the way down a perfect fit 10 mins later after it was all tight
this how i did the pre load on my Morris diff, ok so it he preloads is 30ftlbs at 1 inch then thats equal to 3 lbs at 10 inch, I used a tight nut and bolt on the flange , then added a 10 in ring spanner , hooked a welding rod in the free end and put a plastic milk container on a set of food scales added water until it read 3 lbs the hooked it in the spanner, so if you spanner is longer it needs less water, if it shorter it need more water OK
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