changing ring and pinion gears
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changing ring and pinion gears
I have a 2002 f250 super duty 5.4 gas engine I am changing my differential gears from 3.73 to 4.10. I tow a 7000lb trailer and I was told if I change the gears I would notice a big difference. Can anyone tell me any of the torque specs and anything else I would need to know before I start this project.
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To be honest, I would go higher than a 4.10. That isn't far off from 3.73 at all. The difference will be minimal. Try 4.30 or 4.55 if you want to really get extreme.
BTW, Randy's Ring and Pinion is where you want to order from. Extremely knowledgeable people, courteous, prompt, on the ball, with good tax free prices. (If they are not in your state.)
BTW, Randy's Ring and Pinion is where you want to order from. Extremely knowledgeable people, courteous, prompt, on the ball, with good tax free prices. (If they are not in your state.)
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Joined: Feb 2008
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I have a 2002 f250 super duty 5.4 gas engine I am changing my differential gears from 3.73 to 4.10. I tow a 7000lb trailer and I was told if I change the gears I would notice a big difference. Can anyone tell me any of the torque specs and anything else I would need to know before I start this project.
You Keep What You Kill
Joined: Dec 2006
Posts: 4,902
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From: Huntersville, NC
i hear a lot of people say order from randy's ring and pinion but i found their prices a bit high. i ordered my gears from Early Bronco Restoration Full Size Bronco Restoration Classic Ford Bronco Parts For Sale they knew their stuff and fast shipping. same gears as randys's for less. not trying to bash anyone though... 4.55 would be too much for stock tire height IMO. I'm putting 4.88 in my lifted f250 with 35's because i'm planning on going to a bigger tire. hope this helps
http://broncograveyard.com/
Fleet Mechanic
Joined: Apr 2007
Posts: 1,433
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From: NH
IMO being a "02" truck with most likely high mileage you may be better off with the master rebuild kits. If getting into teardown the kit would be your better choice. As Krewat mentioned if your not close to an expert or have done it more than a few times you may consider having them done. Will become rather costly but you have a better piece of mind.
You Keep What You Kill
Joined: Dec 2006
Posts: 4,902
Likes: 2
From: Huntersville, NC
IMO being a "02" truck with most likely high mileage you may be better off with the master rebuild kits. If getting into teardown the kit would be your better choice. As Krewat mentioned if your not close to an expert or have done it more than a few times you may consider having them done. Will become rather costly but you have a better piece of mind.
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FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
The change to 4.10 gears is very significant. You'll notice it.
Everything being equal, the 4.10 gearing will increase your torque at the rear axle roughly 10%. 4.33 gears will get you roughly 16% more torque than the 3.73 gears. But, everything isn't equal.
Besides the additional torque multiplication, the gearing also raise the engine RPM for the given speed, thus gaining more power (within reason).
How much? Using the factory ratings and my truck as an example, with the 3.73 gears Ford says I can tow up to 9200 pounds. Throw in 4.10s from the factory (and no other change) and Ford bump that rating up to 11,000 pounds. That's an increase of a little over 19% towing capacity from a simple gear change.
Everything being equal, the 4.10 gearing will increase your torque at the rear axle roughly 10%. 4.33 gears will get you roughly 16% more torque than the 3.73 gears. But, everything isn't equal.
Besides the additional torque multiplication, the gearing also raise the engine RPM for the given speed, thus gaining more power (within reason).
How much? Using the factory ratings and my truck as an example, with the 3.73 gears Ford says I can tow up to 9200 pounds. Throw in 4.10s from the factory (and no other change) and Ford bump that rating up to 11,000 pounds. That's an increase of a little over 19% towing capacity from a simple gear change.
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