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10.25 rear axle questions

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Old 11-25-2017, 04:01 AM
bart f-350
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10.25 rear axle questions

Hello all, I've got some tech questions about my 1989 F-350 10.25 Sterling dually rear axle;

1) gear oil started to contaminate the brake linings, I suspect the seals just behind the ancor plates (which hold the brake cilinders), how best to replace them?

2)what would be the (documented) max. weight these axles can have?
(I need that for registering purposes)

3) What ring/pinion gears are available for this axle? I have now 1:4.10, and I want to search the right gearing for bigger wheels.

Thank you for any of your thoughts.
 
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Old 11-25-2017, 06:50 AM
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Your leak is from the axle seal. Use a 34384 Scotseal, a better two piece design.
 
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Old 11-25-2017, 10:09 AM
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Originally Posted by bart f-350 View Post
2)what would be the (documented) max. weight these axles can have?
(I need that for registering purposes)
Check your axle code on the door sticker. If it's "65" of "F5", 8250lbs is what it's rated as.

Originally Posted by bart f-350 View Post
3) What ring/pinion gears are available for this axle? I have now 1:4.10, and I want to search the right gearing for bigger wheels.
How big a wheel and what are you going to be doing with it?
What transmission?

I've always felt that 4.10 gearing is a bit low as it is - perfect for 55, but the engine's screaming at 75, so adding bigger wheels should help your highway performance on OD.

If you are running into power issues, add a turbo(if there isn't one already), add an EGT gauge and crank up the power! It's amazing what these engines will do with a bit of boost and some fuel to match.
 
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Old 11-25-2017, 11:34 AM
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Hello,
Axle code is W5 Trans E. that's all I could read in the bottom line.

The tires I'm planning (and trying to calculate for) are 38x13R16.
The whole Idea is that I'd like to go travel with it, and I start with calculating, and make drawings for a box body on the back.

A little bit like "Turtle Expedition", but with my touch to it.

The Dually set up has to go, but I need to find a single rear tire that can carry all the weight that the truck is allowed to carry, you know, a safety and law thingy over here...

I'd like to go with single rear wheels due to the tracking in sand, and between the duallies got too many a stone stuck.
Second thing is that the overall width will be less, 2.38 Meter now, while the drivers cab is 2.00 Meter.

Oh, the gearbox is a E4OD.

And for the moment there is no turbo, depends on my wallet if there comes one in the future. (I'd like to...)
 
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Old 11-25-2017, 03:33 PM
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W5 axle code is 8,250lb 4:10 gear ratio limited slip axle.
if you are thinking of going with the interco "super swamper" 38X13X16 tire, they are only a load range C tire and are only rated for 2700 lb max load.
 
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Old 11-25-2017, 04:42 PM
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Hmmm, where did you find that axle code? a couple of years back I searched all over for that one, couldn't find!
Thanks!
one more question, because it looks to me that you are really into this stuff, It's a 1989 F-350, 11000lbs gvw, 7.3IDI E4OD 4x4 161"WB, front D60 rear sterling 10.25 both 1:4.10 could you tell me maybe how much she would be allowed to tow?
Thanks in advance.
 
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Old 11-25-2017, 05:29 PM
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89 F-350 diesel with 4.10 gears has a GVWR of around 8,800lbs, and a combined weight rating of around 17,000 lbs.
your truck probably weighs around 7200 lbs or so, so that will give you are carry weight of around 1500 lbs, and a tow weight of around 10,000 lbs.
i would run minimum an E rated tire on that rig.
 
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Old 11-25-2017, 06:12 PM
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thanks, for the moment, it has the tires as specified on the door jamb sticker, 235/85R16 @ 65psi, and for the rear axle it has 2645lbs over.
that means, if I charge the truck until it's max rear axle weight, I still can charge 2645lbs before I go over the limit for the tires.
and the tires that I'm thinking about, Michelins, have a weight rating of 5068lbs per tire single fitment. I think that will do.
 
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Old 11-25-2017, 06:17 PM
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sorry, my truck is not 8800lbs, it is allowed to weigh 11000lbs as a truck with payload.
and as it has the ambulance package I can't find the tow weight.
but since these are exactly the same trucks as a normal F-350 where a tow weight is indicated, I'm searching for one that tells me that value.
btw I did see somewhere that while the truck is allowed to weigh 11000Lbs, that the brakes are designed (on my truck) to cope with 14000 or 17000Lbs, that I forgot. (too long ago)

would that be the value I search for?
 
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Old 11-26-2017, 08:33 AM
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that 14 or 17 thousand value is the combined gross vehicle weight. truck and towed trailer. not what the truck is allowed to carry.
and the trailer would still need to have brakes.
14,00 is for manual trans, 17,000 is for auto trans.
those Michelin XLM tires are sweet, i wish i could justify a set or 5 for my trucks.
 
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Old 11-26-2017, 12:29 PM
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Thanks for the explanation of the 14 & 17000 values.
Hihihi, funny that you found out about the XML's...

Though for the moment I did only some calculations based on the size and weight capacities, I dont have a clou what they cost!?
On the other hand, I know a business where they deal in army takeoffs, 90% tread left is regular.
 
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Old 11-26-2017, 12:59 PM
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I think you should also see what the local DMVs rules are with regards to the "GCVWR"(combined weight) - at least around here(in Idaho), the "GVWR" is what matters generally(that's what's on the door tag), and I can register the truck with either car plates(8800lbs GCVWR), or "light truck" plates, with an option of either 16,000 or 26,000lbs "GCVWR". And I did it once - registered my F-250 as 26,000 GCVWR and they didn't bat an eyebrow.

Then I realized that I only usually tow maby 16,000 max - 6,600lb truck + 6600lb truck on 3500lb trailer = almost 16k). That, NA, would be a bit of a stretch with an IDI(if you want to go 60); with a turbo and fuel cranked up(4.10 gearing)? It pulls it easily enough; 75+ is possible(though probably not a good idea to go that fast unless you have a well-balanced rig with weight-distributing hitch etc).

It all depends on how much they care etc. The "GCVWR" rating for the truck is found nowhere on the truck itself, I've only found it in the manual.
What's interesting is that technically, one of these trucks could get a "GCVWR" of 26,000 with a 5.13 rear axle, and 460/7.5L V-8... which means that it's not a stopping issue, just an accelerating/starting deal.
It may also have something to do with the silly DMF they put behind the 7.3 diesels - that thing will slip internally if you get it hot and load it down.
 
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Old 11-26-2017, 01:03 PM
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to buy new they are around $1300 USD each if i remember correctly.
military takeoff usually go around $300-$400 USD each.
 
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Old 11-26-2017, 02:00 PM
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Originally Posted by tjc transport View Post
89 F-350 diesel with 4.10 gears has a GVWR of around 8,800lbs, and a combined weight rating of around 17,000 lbs.
your truck probably weighs around 7200 lbs or so, so that will give you are carry weight of around 1500 lbs, and a tow weight of around 10,000 lbs.
i would run minimum an E rated tire on that rig.
OP's "About Me" profile...country of origin: FR which I assume is France.

So, I have to wonder, did the OP buy this F350 in Europe, or in the US or Canada, then have it shipped "across the pond?"

OP says his '89 F350 4WD has a 11,000 lbs. GVWR .. but this GVWR is not listed in the 1980/89 truck parts catalog.

OP: TYPE/GVW listed on the Certification Label, post what the code is. This is the same label where the W5 AXLE code is listed.

Pic: Column right, 4th entry: W5

 
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Old 11-26-2017, 02:22 PM
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@ Tom, well, easy choice ehh?

@ Mc Grobb, what is a DMF?

you might have noticed, I don't have to deal with anything US.
Here in France things are different.

Not easier, just different...
for a starters; cars, are anything under 3500Kg you then have the choise of private use, or business use (usually only two seats and a place for the payload)

everything above 3500Kg is a truck as in commercial transport, only exeptions are antique,RV,or very rare a private driven (not commercial) truck.
Or a bus as in school bus, or travel bus (30 or more persons to i.e. skieing)

in trucks you have some classes, up to 7500Kg, 12000Kg and above, that has to do with road tax, and driving on sunday's and holidays.

Other than that, if a manufacturer states (on a typeshield or so) that a certain vehicle is allowed for only so many pounds/Kg and they find you in a road check, accident or so, too heavy loaden, you do not only have a fine to pay, but it's ver well possible that the assurance will not pay the damage. and they even can summone your drivers licence.

Therefore I'm trying as accurate as I can all these weights.
They will be documented in the vehicle papers (and the computers of the issuing organisms).
and all over here in Europe they have loops in the road surface whith which the count, and weigh the vehicles, and camera's alongside, so that they can sent you a fine if you are loaded too heavy.

So you don't see an officer, you just get a fine in the mailbox...
 
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