Differential question
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Elder User
Joined: Dec 2008
Posts: 657
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From: Ocala
Differential question
My truck came with an open 3.55 differential and I hate it. I was at the junkyard the other day and they have a 98 gas f-250, it has a 3.73 LS rear-end with disc brakes that I could get a pretty good deal on. Does anyone know if those differentials will fit an OBS truck? I dont know if the diesels and gassers had different rear-ends.
Posting Guru
Joined: Jan 2009
Posts: 1,955
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From: Wyoming
The only difference between the diesel and gas rear ends in the same era, are the yokes at best. You can definately swap from a gas diff and diesel diff! As for the 98, pull a little research! Check the axle model from the donor, if its the sterling model, I think you are set to go.
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
If it's from a NBS then the wheels won't fit...metric. They may even have 7 lugs if it's a 250HD.
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Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
Don't you mean if its a 250LD?
Don't you have to swap the whole rear axle and not just the differential?
Don't you have to swap the whole rear axle and not just the differential?
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Postmaster
Joined: Nov 2005
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From: San Ramon Ca.
What ever the rear end is your looking at it isn't going to work. If you don't like like your ratio change the ring and pinion and add your choice of locker. A used LS isn't going to give you much of an advantage in any case.
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
The pinons on the Gen 3 10.5 are different than a gen 2 10.25
If you pull the carrier from the gen 3, you'll have to go find a gen 2 pinion to go with it to swap it into your truck.
The Gen 3's incorporated a 3 spider differential which is stronger than the older first and second gen 2 spider setups.
Ford 10.25 & 10.50-Inch Axle Tips - Four Wheeler Magazine
If you pull the carrier from the gen 3, you'll have to go find a gen 2 pinion to go with it to swap it into your truck.
The Gen 3's incorporated a 3 spider differential which is stronger than the older first and second gen 2 spider setups.
Ford 10.25 & 10.50-Inch Axle Tips - Four Wheeler Magazine
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