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Old 04-26-2016, 02:15 PM   #1
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Need some help with changing gears from 3.73 to 4.30

Has anyone in the upstate of South Carolina had this done. I have a 2015 F-250 and would like to have this done. I have checked a couple of local ford dealers and they said they didn't have time to do it and really didn't want to do it. Would like to have it done but would like to have it done by someone that has done it many times and knows what they are doing. Any help would be great. Thanks Russ
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Old 04-26-2016, 02:36 PM   #2
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Try an off-road shop. They usually have experience changing gears whenever installing bigger wheels on lifted trucks.

Why such a big jump in gearing?
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Old 04-26-2016, 02:54 PM   #3
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Should not be a big deal for any Ford dealer. Really not a big deal for any shop that knows what they are doing. Try an off-road shop or speed shop, common stuff for a busy shop.
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Old 04-26-2016, 02:54 PM   #4
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X2, just go to an off-road shop or an independent shop that specializes in rearend work.
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Old 04-26-2016, 03:00 PM   #5
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Originally Posted by Zac808 View Post
Try an off-road shop. They usually have experience changing gears whenever installing bigger wheels on lifted trucks.

Why such a big jump in gearing?
As far as I no that is my only options for a ford. I might be wrong?
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Old 04-26-2016, 03:02 PM   #6
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As far as I no that is my only options for a ford. I might be wrong?
Another thought is if someone has had this done was there a problem with warranty?
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Old 04-26-2016, 07:13 PM   #7
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I looked-up where you live.
I used to deliver auto parts. Across from an O'Reilly store is a mechanic I've seen perform a lot of work on diffs. I asked him about it...he says not many mechanics know that work. I'd give him a call. He's not too far from you. He's honest and totally reasonable. Tell him old delivery guy DON recommended him.

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Old 04-26-2016, 09:30 PM   #8
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As far as I no that is my only options for a ford. I might be wrong?
If you insist on Ford OEM parts, then you're right, the next available ratio after 3.73 is 4.30. But if you'll be okay with excellent aftermarket parts, then Randy's Ring and Pinion will sell you a Yukon Gear brand 4.11 ring gear and pinion for your 37-spline axle.
https://www.ringpinion.com/b2c/Produ...rd&ShowAA=true

Note that most good mechanics will not install parts you didn't buy from them. So don't order from Randy's until you have a good rear end man that will install the parts you bought somewhere else,
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Old 04-26-2016, 11:29 PM   #9
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not sure completely what your trying to accomplish, but that change is only approx. 250 rpm at cruise. is it start ability your after or slower speed at same rpm as now? fair amount of expense for not much change. jmho
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Old 04-27-2016, 12:32 AM   #10
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Here is a suite that can help you decide what gears you need and what they will do.
Also a good tire info suite. Gear Ratio Calculator
Have fun and good luck.
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Old 04-27-2016, 12:56 AM   #11
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I asked him about it...he says not many mechanics know that work.
True. It is almost never needed in the regular line of auto repair work. It does require special knowledge to set the gears properly. It's getting to be a lost art with so many front wheel drive cars on the road.
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Old 04-27-2016, 04:45 AM   #12
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not sure completely what your trying to accomplish, but that change is only approx. 250 rpm at cruise. is it start ability your after or slower speed at same rpm as now? fair amount of expense for not much change. jmho
Right now I am good for 12,400 with the 3.73 and with the 4.30 it would give me 3000 lbs to 15,400. Also from what I have read, having the 4.30 is the only way to go. I have read that it would cost about $1500 to $2000 to have this done and to trade it in on a 6.7 I would take a beaten.
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Old 04-27-2016, 04:49 AM   #13
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Originally Posted by Highway 4x4 View Post
Here is a suite that can help you decide what gears you need and what they will do.
Also a good tire info suite. Gear Ratio Calculator
Have fun and good luck.
Thank you Highway 4x4
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Old 04-27-2016, 04:51 AM   #14
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Quote:
Originally Posted by SmokeyWren View Post
If you insist on Ford OEM parts, then you're right, the next available ratio after 3.73 is 4.30. But if you'll be okay with excellent aftermarket parts, then Randy's Ring and Pinion will sell you a Yukon Gear brand 4.11 ring gear and pinion for your 37-spline axle.
https://www.ringpinion.com/b2c/Produ...rd&ShowAA=true

Note that most good mechanics will not install parts you didn't buy from them. So don't order from Randy's until you have a good rear end man that will install the parts you bought somewhere else,
Thank you Smokey Wren.
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