Rennat_2006
Well-known member
I've found bits and pieces of information on this on multiple sites, I'm gonna put it all together here.
here is what I've found with my 79 Ford hp d60...
Normal "old school" dana/spicer #36487
nothing wrong with these, work fairly well on good non pitted axle shafts and good straight housings.
"First Gen" superduty seals, national seal part number #710492. This is what oreillys computer list for axle seals for my 79 hp d60 also BUT they DO NOT fit without some modification, I will cover that below. I have ran these and they work great if you have old axle shafts with scored or pitted sealing surfaces. These are somewhat a pita to install also, not going to be able to just pound these in like the old school seals above, I took a piece of 1/2 all thread with some plates and a bushing driver and push them from inside of the differential housing. Install the bearing cap on the opposite side and use it for your backer per say for your tooling. Make sure your pushing on the very outside of these seals, you will screw them up on the install if not.
I will warn you though the axles have to be pounded into the seals due to their 2 piece design and are a real PITA to remove for teardown, not something your gonna want to do on the trailside. I had to get a pry bar behind the yoke of the inner axle and pry against the tube/c to work them out. Took me about an hour to get both shafts out.
modification to make these work...
My axle tubes have 2 steps per say machined into them as they enter the center section. The normal ID of the tube itself, then a step down of about a half inch long, then another step down where the seal gets installed. The outer lip on the black part of the seal above does not fit into the first step down from the full axle tube ID. You will need to take a grinder or similar and grind down the OD of that lip to fit into the ID of the second step of your axle tube. I've been told later axles may not need this modification. You will be ok without this lip because the seal will only float in just a little bit before it hits the carrier bearing.
"Second Gen" superduty axle seals, national part #710865
just installed these and did not have to make any modifications, these do not press all of the way in like you would think. They bottomed with about a 1/8" still showing but there is plenty of clearance for the carrier and bearings to fit correctly from what I can tell. I will work on finding good picture of this one.
here is what I've found with my 79 Ford hp d60...
Normal "old school" dana/spicer #36487
nothing wrong with these, work fairly well on good non pitted axle shafts and good straight housings.
"First Gen" superduty seals, national seal part number #710492. This is what oreillys computer list for axle seals for my 79 hp d60 also BUT they DO NOT fit without some modification, I will cover that below. I have ran these and they work great if you have old axle shafts with scored or pitted sealing surfaces. These are somewhat a pita to install also, not going to be able to just pound these in like the old school seals above, I took a piece of 1/2 all thread with some plates and a bushing driver and push them from inside of the differential housing. Install the bearing cap on the opposite side and use it for your backer per say for your tooling. Make sure your pushing on the very outside of these seals, you will screw them up on the install if not.
I will warn you though the axles have to be pounded into the seals due to their 2 piece design and are a real PITA to remove for teardown, not something your gonna want to do on the trailside. I had to get a pry bar behind the yoke of the inner axle and pry against the tube/c to work them out. Took me about an hour to get both shafts out.
modification to make these work...
My axle tubes have 2 steps per say machined into them as they enter the center section. The normal ID of the tube itself, then a step down of about a half inch long, then another step down where the seal gets installed. The outer lip on the black part of the seal above does not fit into the first step down from the full axle tube ID. You will need to take a grinder or similar and grind down the OD of that lip to fit into the ID of the second step of your axle tube. I've been told later axles may not need this modification. You will be ok without this lip because the seal will only float in just a little bit before it hits the carrier bearing.
"Second Gen" superduty axle seals, national part #710865
just installed these and did not have to make any modifications, these do not press all of the way in like you would think. They bottomed with about a 1/8" still showing but there is plenty of clearance for the carrier and bearings to fit correctly from what I can tell. I will work on finding good picture of this one.
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