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Old Jan 23, 2006 | 02:59 PM
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Question rear end

what is the best way to tell what size differential i have? i want to put in a limited slip or track lock diff and i need to know what to buy...what size, how many splines, etc.

i have a 93 f250 i6 2wd.

also, which in your opinion is better: limited slip or track lock? and what do i need to buy to replace it...something like this, for example:



thanks. chris
 
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Old Jan 23, 2006 | 03:35 PM
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You have a sterling 10.25" axle. Any reputable shop will be able to sell you the parts you need just based on year and model. If they can't, keep looking.

As for which is better, they both had their pros/cons. It would really depend on what you plan to do with the truck.

Depending on what solution you choose, you may or may not need to replace the carrier. A powertrax no-slip, for example, just replaces the spider gears and can be done in your driveway. A detroit locker replaces the carrier and requires the gears to be set up again in a shop.
 
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Old Jan 23, 2006 | 06:42 PM
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Might be the Sterling 10.25, but there was also a semi-float axle thrown around there in those trucks for a few years. I'm not sure of the years it was used and with what engines, but you should check for yourself before you order anything.
Does the axle have a hub sticking through the wheel center with 8 bolts (5/8") securing the axle shaft to the hub?
Or is it just flat there?


And the Limited Slip is the Track lock. Thats the track lock for an 8.8 in the picture
 
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Old Jan 23, 2006 | 09:42 PM
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if i took it somewhere and had them convert it to either, how much should i expect to spend? the reason i want this is because if i am yanking on something or hop off the road for a short jog and start to spin a tire, i want the other to kick in so i have a 2wd, not a 1wd.
davebowman, if i understand correctly, you are saying they are the same thing?
thanks everyone...chris
 
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Old Jan 23, 2006 | 10:00 PM
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Semi-float or not, it's still a sterling 10.25" axle in an F-250.

The cost depends on what locker or LS you choose. All are not created equal in price. Some require significantly more labor to install than others.

From what you describe, it sounds like a locker would be overkill. I would look at a limited slip of some kind. Auburn is a good name, and so is powertrax. Call around and ask about prices.
 
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Old Jan 23, 2006 | 11:01 PM
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thanks andy m...ill look into it and post if i have any more questions....
acutally one that pops into my head is that it could be an f150...it is registered as an f250 but when my stepdad bought it new the dealer said it was a combination of 150 and 250...would this make a difference? if it does, is there a code i can check that says what rear it has or bolt pattern or anything. other than that, i think you have answered all my questions...
thanks again
chris
 
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Old Jan 23, 2006 | 11:22 PM
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Originally Posted by andym
Semi-float or not, it's still a sterling 10.25" axle in an F-250.
I thought it was like a 9.75".......?

I seem to remember hearing somewhere gears and carriers didn't interchange between the two.
 
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Old Jan 24, 2006 | 10:50 AM
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You're right, the carriers won't interchange between the two, but there's no way he has a 9.75" axle under a 93 F-250.

The 9.75" axle didn't come out until 98 or so. And even then, it was only put in the F-150's. Starting in 1999, the superduties got 10.5" axles. The housing looks the same from the outside, but I haven't inspected each one up close. The 10.5" axle is a full floater, and the the 9.75" is a semi-floater.

In 1997 and 1998, there was an oddball axle. It was a semi-float axle with 7 lugs. I don't know how big the ring gear is. It came in the equally oddball 'light duty' F-250 in those years.

Up until 85 or so, all F-250's got a Dana 60 minimum. Some got 70's, but they're rare. When Ford ran out of Dana 60's, they started using sterling 10.25" axles. The only trucks that got semi-float 10.25" axles were the light duty F-250's. Everything else is a full floater.
 
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Old Jan 24, 2006 | 10:52 AM
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Originally Posted by 4.9inline6
thanks andy m...ill look into it and post if i have any more questions....
acutally one that pops into my head is that it could be an f150...it is registered as an f250 but when my stepdad bought it new the dealer said it was a combination of 150 and 250...would this make a difference? if it does, is there a code i can check that says what rear it has or bolt pattern or anything. other than that, i think you have answered all my questions...
thanks again
chris
There's really no such thing as a combination of an F-150 and an F-250. The dealer (surprise!) had no idea what they were talking about.

The easiest way is to count the lugs. If there are 8 per wheel, then it's an F-250 with a sterling 10.25" axle. If it has 5, it's a Ford 8.8" axle.
 
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Old Jan 24, 2006 | 04:39 PM
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yes it is an 8 lug wheel. sterling 10.25" it is. thanks guys
 
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Old Jan 24, 2006 | 05:25 PM
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If its the axle ratio you're looking for isn't there a tag under one of the bolts on the diff,if so ,you can decipher code for ratio.
 
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