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04-26-2016, 01:15 PM
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#1
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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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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04-26-2016, 01:36 PM
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#2
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Senior Member
Join Date: Jun 2015
Location: Viva Las Vegas
Posts: 252
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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?
__________________
2014 Grand Design Reflection 337RLS
2005 GMC Sierra 2500HD SLT CC 4x4
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04-26-2016, 01:54 PM
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#3
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: Port Charlotte Florida
Posts: 2,721
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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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[SIGPIC][/SIGPIC]2008 Bounder 38P F53 24/30K V10, 2013 Kia Soul Basic 6 speed manual, Ready Brake Elite tow system (previous equipment 1996 Pace Arrow Vision w/Acme Dolly)
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04-26-2016, 01:54 PM
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#4
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Senior Member
Join Date: Aug 2013
Location: Cincinnati, OH
Posts: 849
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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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2017 Renegade Verona 36 VSB
2005 Kenworth Showhauler truck conversion. sold .
I used to have a handle on life, but it broke 
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04-26-2016, 02:00 PM
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#5
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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Quote:
Originally Posted by Zac808
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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As far as I no that is my only options for a ford. I might be wrong?
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04-26-2016, 02:02 PM
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#6
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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Quote:
Originally Posted by roothoss1282
As far as I no that is my only options for a ford. I might be wrong?
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Another thought is if someone has had this done was there a problem with warranty?
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04-26-2016, 06:13 PM
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#7
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Senior Member
Join Date: Feb 2013
Location: Wandering
Posts: 635
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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.
Ronnie Wright Automotive
101 Joey St, Anderson, SC
(864) 375-9888
__________________
2014 XLR415AMP Thunderbird ToyHauler, 2019 Sandpiper 379FLOK, F350 Lariat Diesel DRW, NRA Benefactors FullTime RV'er KN4YBP General License
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04-26-2016, 08:30 PM
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#8
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Moderator Emeritus
Join Date: Jun 2011
Location: HillBilly country, Smokey Mtns
Posts: 4,171
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Quote:
Originally Posted by roothoss1282
As far as I no that is my only options for a ford. I might be wrong?
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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,
__________________
Grumpy ole man with over 60 years towing experience. Now my heaviest trailer is a 7'x16' 5,000-pound flatbed utility trailer, my tow vehicle is a 2019 F-150 Lariat 3.5L EcoBoost SuperCab with Max Tow (1,904 pounds payload capacity). 
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04-26-2016, 10:29 PM
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#9
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Senior Member
Join Date: Nov 2010
Posts: 2,415
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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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04-26-2016, 11:32 PM
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#10
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Registered User
Outdoors RV Owners Club
Join Date: Jan 2014
Location: La Verne, Calif
Posts: 3,649
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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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04-26-2016, 11:56 PM
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#11
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Quote:
Originally Posted by dwhit
I asked him about it...he says not many mechanics know that work.
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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.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
 Yellowstone Lake 6-1-2012
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04-27-2016, 03:45 AM
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#12
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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Quote:
Originally Posted by laj
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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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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04-27-2016, 03:49 AM
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#13
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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Quote:
Originally Posted by Highway 4x4
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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04-27-2016, 03:51 AM
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#14
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Senior Member
Thor Owners Club Carolina Campers
Join Date: Nov 2015
Location: Upstate South Carolina
Posts: 114
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Quote:
Originally Posted by SmokeyWren
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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