Differential questions
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Cross-Country
Joined: Nov 2004
Posts: 82
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From: St Thomas
Differential questions
Hello all-
I bought an 1989 4WD F350 Dually with a dump bed, 7.3 diesel engine. After I hauled the first load, I saw fluid leaking under the right rear wheels, so I figured 2 new brake cyls would do it. Well to make a long story short, I had to pull the hub and install a new axle seal, and I replaced the pinion seal as well. Now I have 3 questions for the experts-
1) This rear end is the Sterling 10.25 full floating axle. I repacked both the inner and outer wheel bearing according to the Chilton manual- Now I read on this forum that you should not pack the bearing, it restricts oil flow to the outer bearing. Any thoughts?
2) One guy here suggested using the Lucas oil, as it really adheres to the bearings. Any advantage of Lucas oil over synthetic?
3) I'm embarrassed to admit it, but I can't find the filler plug on this differential. Anybody know where the hell it is?
Thanks all...Merry x-mas
I bought an 1989 4WD F350 Dually with a dump bed, 7.3 diesel engine. After I hauled the first load, I saw fluid leaking under the right rear wheels, so I figured 2 new brake cyls would do it. Well to make a long story short, I had to pull the hub and install a new axle seal, and I replaced the pinion seal as well. Now I have 3 questions for the experts-
1) This rear end is the Sterling 10.25 full floating axle. I repacked both the inner and outer wheel bearing according to the Chilton manual- Now I read on this forum that you should not pack the bearing, it restricts oil flow to the outer bearing. Any thoughts?
2) One guy here suggested using the Lucas oil, as it really adheres to the bearings. Any advantage of Lucas oil over synthetic?
3) I'm embarrassed to admit it, but I can't find the filler plug on this differential. Anybody know where the hell it is?
Thanks all...Merry x-mas
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
I always hand pack the bearings on a full floater.
No need to over do it though, just enough grease to ensure sufficient lubrication until the rear end grease gets to them so they do not run dry at first.
No need to over do it though, just enough grease to ensure sufficient lubrication until the rear end grease gets to them so they do not run dry at first.
Senior User
Joined: Aug 2003
Posts: 183
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From: Chestermere,Alberta
OK. First on a 10 1/4 rear diff you DO NOT pack the rear wheel bearings in the hubs. You lube them with differential oil and put then in.Just before you put in the outer bearing into the hub,you squirt some lube into the rear hub and then put the bearing in and torque the hub nut.Then put the axle in and torque the axle nuts.
Second you fill from the front of the diff.You may have to dig arround for the plug because of mud build-up
Second you fill from the front of the diff.You may have to dig arround for the plug because of mud build-up
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Cross-Country
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From: St Thomas
Shat, one guy says pack them, another guy says don't pack them, which one is it? I gues i need to talk to somebody who rebuilds these things for a living. What about this Lucas oil? anybody use it? I hear it's a good oil or should I take it back for synthetic?
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Lead Driver
Joined: Aug 2006
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From: Sand Lake, MI
Originally Posted by freightdogfred
Shat, one guy says pack them, another guy says don't pack them, which one is it? I gues i need to talk to somebody who rebuilds these things for a living. What about this Lucas oil? anybody use it? I hear it's a good oil or should I take it back for synthetic?
Just don’t install the bearings dry.
Fill the differential up the to the fill plug and squirt a bunch of extra in, then take it for a ride turning corners so it runs out to the hubs.
Then check the level again and top it off so it is full to the bottom of the fill plug.
Sheesh, It’s not rocket science!
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