“ did you totally dismantle your front axle..?? “YUP down to the last nut and screw, will finish reassembling it today after I sign off. As the purpose of the inter seal is to keep the differential grease from running into the steering knuckle at the end and hence out into the brakes. This only happens on a steep cross slope. I have never replaced these on any of the trucks logic being that I am not likely to lay the truck over enough for this to be a leak problem. I just leave the old seal in place to act as a dam.
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