Sterling 10.25
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Lead Driver
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From: Orcas Island Wa.
Sterling 10.25
I have a 10.25 sterling in two of my trucks. My '92 F350 came with one and I recently installed one from a '92 F350 2wd dually pickup in my '59 F350 flareside. How can I tell if either one is a limited slip version?
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you have a few options here, only one of which i'm sure will work for you
1) look at the door sticker on the donor truck. if the axle code is just numbers (33 or whatever), you're open diff. if its letters and numbers (c5 for example), you're LSD
2) scrape all the gunk off the steel tag on the diff, that will tell you the ratio and if its open or limited slip.
3) park the truck, block front wheels, and leave it in neutral with the parking brake off, then lift one rear wheel. turn that wheel, if it turns easily and the driveshaft turns with it, you're looking at open diff. it it doesn't want to turn, raise the other rear wheel too. a limited slip will have both wheels turning together with the driveshaft.
but of course, this test doesn't tell you if your clutch packs in there are worn out, reducing the effectiveness of the unit, it just tells you if you have one or you don't
1) look at the door sticker on the donor truck. if the axle code is just numbers (33 or whatever), you're open diff. if its letters and numbers (c5 for example), you're LSD
2) scrape all the gunk off the steel tag on the diff, that will tell you the ratio and if its open or limited slip.
3) park the truck, block front wheels, and leave it in neutral with the parking brake off, then lift one rear wheel. turn that wheel, if it turns easily and the driveshaft turns with it, you're looking at open diff. it it doesn't want to turn, raise the other rear wheel too. a limited slip will have both wheels turning together with the driveshaft.
but of course, this test doesn't tell you if your clutch packs in there are worn out, reducing the effectiveness of the unit, it just tells you if you have one or you don't
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From: Orcas Island Wa.
Thanks for the help. Looks like the '59 is open diff 
And the '92 is just numbers .... Oh well, the '92 is 4wd and the '59 F350 flareside diesel conversion is more of a good weather rig..... the old stuff doesn't hold up under even the small amount of road salt we see here in the Pacific Northwest. The '92 IDI cab/chassis has no signs of rusting but the utility box that was installed when new has a couple of crossmembers that are completely eaten through. A lot of dirt roads on this island, and the rigs are packed with mud that never dries out, and as we heard back in the 70's... Rust never sleeps.
And the '92 is just numbers .... Oh well, the '92 is 4wd and the '59 F350 flareside diesel conversion is more of a good weather rig..... the old stuff doesn't hold up under even the small amount of road salt we see here in the Pacific Northwest. The '92 IDI cab/chassis has no signs of rusting but the utility box that was installed when new has a couple of crossmembers that are completely eaten through. A lot of dirt roads on this island, and the rigs are packed with mud that never dries out, and as we heard back in the 70's... Rust never sleeps.
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Lead Driver
Joined: Jan 2005
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From: Orcas Island Wa.
I did the lift one wheel thing and the wheel turned easily along with the drive shaft, so I figured it was open diff. If it has worn clutch pack, will it continue to function properly but just have less traction? Maybe I should crawl under it and look at the tag. I know it has a tag because I remember it's 4.11. It does also have an electrical plug on it. What's that about? Oh, and the '59 has a cummins '6at' six cyl turbo diesel. It runs real nice and I do 65 mph easily. It's only 120 hp, so I shift a lot. This type cummins was used in UPS trucks and always mated to GM trannys. I'm running an sm465 and it has two huge gaps in the ratios that kill me on the hills. A friend about a mile away has an auxillary transmission in a 50 gmc 1 1/2 ton that he said I could have. Thinking of going to look at it today. Read a great 17 page thread on aux trannys yesterday in the gearbox section. Thanks for the help. Gary
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usually worn out clutches aren't so bad that you can easily spin one wheel, but i guess its possible with enough neglect. usually they leave you with at least a little friction to tell you there was supposed to be something there, even though they function as an open diff
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