Re-gear ?,?,?
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
Re-gear ?,?,?
I have three questions for the guys & gals that have swapped from 3.55 gears to 3.73.
1: How was fuel economy affected?
2: How much more pulling power or acceleration was achieved?
3: Will the gears from the front of a 2004 F250 FX4 V10 fit in the OBS F250 front differential?
1: How was fuel economy affected?
2: How much more pulling power or acceleration was achieved?
3: Will the gears from the front of a 2004 F250 FX4 V10 fit in the OBS F250 front differential?
Postmaster
Joined: Jun 2009
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From: Monroe/Ellensburg, WA
Someone please correct me if i'm wrong, but i believe our rear ends are 10.25 and the 04's were 10.5. I could be totally wrong though.
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Hotshot
Joined: Jul 2008
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From: Thomasville, GA
That is correct. Ours is a 10.25" gear, '99 and up is a 10.5" gear
Also in 99 they switched to a Straight axle Dana 50 front in the F250's but kept the Dana 60 for F350's as far as I know...
Also in 99 they switched to a Straight axle Dana 50 front in the F250's but kept the Dana 60 for F350's as far as I know...
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
So, how do I go about putting a whole Dana 60 rear axle under the truck?
Can I just replace my rear differential with a Dana 60?
Can I just replace my rear differential with a Dana 60?
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Hotshot
Joined: Jul 2008
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From: Thomasville, GA
If you put a Dana 60 in the rear of the truck your speedo won't work and the transmission won't shift because the dana 60 doesn't have a Vehicle Speed Sensor on it.
You could put a Dana 60 in the front if you wanted. It would be a upgrade to the dana 50 you have now.
You could put a Dana 60 in the front if you wanted. It would be a upgrade to the dana 50 you have now.
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
Yeah, but what's the point when you have a 50 in the rear and you can't capitalize on such an awesome deal. 
Did any explorers, expeditions, or exersions have 10.25" 3.73 LS?
The front gears of a superduty F250 will fit in the rear housing of an obs, right?
Did any explorers, expeditions, or exersions have 10.25" 3.73 LS?
The front gears of a superduty F250 will fit in the rear housing of an obs, right?
Hotshot
Joined: Jul 2008
Posts: 11,231
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From: Thomasville, GA
Ok...
1. You don't have a 50 in the rear.
2. Explorers and Expeditions had 8.8 rears. Excursions had a 10.5 rear like the Superduties.
3. The front axles are Dana, the rear are Sterling. Gears won't exchange at all.
Your truck has a Dana 50 TTB front and a Sterling 10.25 rear.
A Superduty F250 has a Dana 50 straight axle front, and Sterling 10.5 rear.
I believe the Dana 50's in the fronts can exchange gears, but the Sterling 10.25 and 10.5 can only exchange Limited Slips, not gears because they are a different size.
You could use the gears from the front, but you'd have to buy 3.73 gears for your rear axle.
1. You don't have a 50 in the rear.
2. Explorers and Expeditions had 8.8 rears. Excursions had a 10.5 rear like the Superduties.
3. The front axles are Dana, the rear are Sterling. Gears won't exchange at all.
Your truck has a Dana 50 TTB front and a Sterling 10.25 rear.
A Superduty F250 has a Dana 50 straight axle front, and Sterling 10.5 rear.
I believe the Dana 50's in the fronts can exchange gears, but the Sterling 10.25 and 10.5 can only exchange Limited Slips, not gears because they are a different size.
You could use the gears from the front, but you'd have to buy 3.73 gears for your rear axle.
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
Clearly that above question wasn't what I was getting after.
Can you put a Sterling 10.5" in the rear of an OBS?
Or can you swap out a 10.25" differential housing with a 10.5" or are the axle shaft tubes a different diameter? Are is it just too hard to swap just a differential housing?
Oh yeah, 99-01 Dana 50 up front, 02-04 Dana 60, not sure on newer models.
Hotshot
Joined: Jul 2008
Posts: 11,231
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From: Thomasville, GA
You could swap a 10.5 into the rear of your truck. Just keep in mind that you would have a different wheel bolt pattern.
The 10.25 is 8x6.5, the 10.5 is 8x170mm
So you'd need a wheel adapter of different wheels.
The 10.25 is 8x6.5, the 10.5 is 8x170mm
So you'd need a wheel adapter of different wheels.