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Superduty Rear Axle

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Old 05-15-2010, 08:20 AM
greywynd greywynd is offline
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Superduty Rear Axle

Wondering about the Superduty rear axle from this truck that I had to make into a trailer. I never did anything to the rear, but as he pulls it with the tractor, it 'clicks'. I'm thinking that it's the meshing of the gears, and it's likely low on gear lube knowing how this poor thing was maintained.

Would it be possible, or how would I go about taking the gears out? I'm thinking that I would either have to make a cover for the front of the pumpkin to keep oil in, or take the wheel assemblies apart and grease the bearings so they don't die an unfortunate death. If this thing happened to have a LS in it, would it be usuable in any of my 'lighter' trucks? I'm thinking that there's no way it would fit, seeing as it looks huge compared to even the F350 rear axles?
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Old 05-15-2010, 08:31 AM
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F250-F450 all had the same rear axles IIRC.
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Old 05-15-2010, 08:24 PM
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Depends, some F-super Dutys as they are called had Dana 80 rear axles.
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Old 05-15-2010, 08:46 PM
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Originally Posted by johnboggs21 View Post
F250-F450 all had the same rear axles IIRC.
nope.
350 and 350 single rear wheel had sterling 10.25 gear with parking brake.
350 dual wheel pickup had sterling 10.50 rear with parking brake..
superduty had dana 80 rear with no parking brake.
tha parking brake on a superduty is on the back of the trans.
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Old 05-15-2010, 09:20 PM
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Wonder why the F-trucks had Sterling axles, and vans had Danas? My motorhome has a Dana 70.
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Old 05-15-2010, 10:25 PM
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Quote:
Originally Posted by tjc transport View Post
nope.
350 and 350 single rear wheel had sterling 10.25 gear with parking brake.
350 dual wheel pickup had sterling 10.50 rear with parking brake..
superduty had dana 80 rear with no parking brake.
tha parking brake on a superduty is on the back of the trans.
Yes, this rear axle is definitely heavier than the one in my dually, and has the disc brakes, and the parking brake was on the rear of the tranny.

I didn't realize the dually's had a different axle than the SRW though, good to know!
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Old 05-15-2010, 11:11 PM
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The D80 is a full floater, which means you can pull the axle shafts and cut their bolt-flange ends off then reinstall just the flanges as caps for the hubs - no shafts to engage the diff means axle will likely stay nice and quiet and roll easier too.
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Old 05-16-2010, 07:05 AM
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LCAM, that's what I was thinking about doing, but wasn't sure if that would create any issues. I had just been thinking that if the 'innerds' were usable in anything else it would have been nice to save them, but other than another superduty it's not very likely.
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Old 05-16-2010, 09:18 AM
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but the full floater uses the axles to pull lube oil out of the diff to lubricate the bearings. if you pull the axles, the wheel bearings will not last very long before they burn up.
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Old 05-16-2010, 09:38 AM
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seal up the axle tube cap end tap hole for oil plug and fill
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Old 05-16-2010, 01:14 PM
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Originally Posted by tjc transport View Post
but the full floater uses the axles to pull lube oil out of the diff to lubricate the bearings. if you pull the axles, the wheel bearings will not last very long before they burn up.
How does that work out? It ain't like the axle shafts are rifled on the outside to help carry oil from the pumpkin outboard... I know in my Sterling axle if you fill to capacity with the axle level oil will just travel down the axle tubes and reach the bearings and leak out the hub end if the axle shaft ain't in place, so the bearings will get enough oil even with the axle not turning at all. With a D80 turned into a trailer axle when he cuts the shafts he can overfill the axle by quite a bit, with the gears not turning there's nothing to generate heat in there and expand the oil and potentially push it out the vent port. Heck my drive axle is always a quart over and never gave me any issues, even tho it gets plenty hot after several hours of running on the freeway...
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Old 05-16-2010, 01:50 PM
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you could always cut off the axles, seal it well, jack up the axle on one side and fill til you see oil. my guess would be about 2 1/2 gallons. you dont care about it being too full since the oil will never get hot enough to expand. then cap it and set it back down. the axle bearings will be 3/4 covered. will be just like an oil bath axle.
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Old 05-16-2010, 05:42 PM
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This thing is now relegated to being pulled by a tractor, maybe 3-4 miles at a time, maximum speed might be 20 mph.... it's not going to take a heck of a lot to lube the bearings to keep them going.
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Old 05-16-2010, 06:14 PM
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Once you get the oil up to level, jack up one side and then the other as high as you can get it. Then refill the diff.

If you're worried about it beyond that. Tear it down and grease pack the bearings.

Jason
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Old 05-16-2010, 06:33 PM
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i took a plastic plug and put in the axle tube made a steel outer caps for each side.
then drilled and taped a fill plug on each side then it only took a quart of oil for both sides
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