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07-02-2017, 04:39 PM
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#41
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Senior Member
Join Date: Aug 2014
Location: Alberta
Posts: 557
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3.42
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07-02-2017, 06:15 PM
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#42
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Senior Member
Join Date: Mar 2017
Location: In the gnat capital of the world, Tifton, GA
Posts: 555
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2016 F-150 2WD 5.0L with 3.55 E-locker and tows without effort on flats and in mountains.
Better than my '09 with 5.4L 4X4 with 3.73 under the same conditions.
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07-02-2017, 06:48 PM
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#43
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Senior Member
Join Date: Feb 2017
Location: Sun City Center, Fl.
Posts: 104
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Quote:
Originally Posted by Dustdevil
Gear ratios for towing are somewhat dependent upon what sort of engine is in the TV. Gassers, regardless of displacement, are more likely to be in the 4.10:1 or lower category, because gassers tend to develop their HP at higher rpm than, say, a diesel. Using a 3.73:1 on a gasser subjects that engine to lugging when pulling hard up steep hills, which won't end well.
Diesels run slower, for a whole host of reasons, but they develop their peak torque and HP at lower rpm. So, the 3.73:1 and 3.55:1 are more appropriate for those. It also depends upon transmission ratios, which can vary from model to model, and from manual to automatic. For towing packages, manufacturers generally select the lower ratios if there is a range of more than one available in their lineup. It's just not as hard on the engine when pulling out of the hole or when dropping into the next higher gear while accelerating. It also has benefits on the downhill side so you can use engine braking. But I would not put a 4.10:1 axle on a diesel, if that's what you are thinking.
3.55:1 is likely ok for a diesel that produces its max torque below 2000 rpm and max Hp below 2500, or on a truck that isn't optioned for towing. I think I'd feel more comfortable with the 3.73:1 on a diesel pickup. This may be the reason there are a lot of them still left on the lot with 3.55:1 axles.
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X2 what he said!
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2014 F350 SD Lariat, 4X2, Ext.Cab 8'Bed, 6.2Ltr gas, 4:30 Rear ratio
2008 Cedar Creek Fifth Wheel 34TSA, 37' (traded in)
2017 Jayco Eagle HT Fifth Wheel 27.5 RLTS
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07-03-2017, 07:58 AM
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#44
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Senior Member
Join Date: Feb 2014
Location: MD
Posts: 3,856
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Duramax with 6spd Allison and 3.73's
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2017 JayFlight 28BHBE
2014 JayFlight Swift 264BH (Sold)
2007 GMC 2500 Sierra Classic Crew Cab LBZ Duramax / 6spd Allison
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07-03-2017, 08:41 AM
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#45
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Senior Member
Join Date: Nov 2014
Location: New Hampshire
Posts: 609
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What Gear Ratio is everyone running
Quote:
Originally Posted by JeremiahM
That's a GAS 6L, completely different. You probably would like 4.30s even better, gassers don't have the low end torque like the diesels
Sent from my SM-G930V using Tapatalk
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Totally agreed. (My apologies if I missed the OP.... was this a diesel discussion?). LOL I can't keep these threads straight. [emoji3]
Craig Bailey
New Hampshire
Jayflight 32 BHDS
Chevy 2500HD CC
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Craig T. Bailey
Hudson, NH
2015 Jayflight 32BHDS
2018 Chevy 3500HD Crew 4x4 Duramax
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07-03-2017, 08:47 AM
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#46
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Senior Member
Join Date: May 2013
Posts: 1,588
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I would run 4.30s on a diesel and put 44in tires on it. But that's just me.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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07-03-2017, 12:46 PM
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#47
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Senior Member
Join Date: Sep 2016
Location: Gillsville
Posts: 375
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Quote:
Originally Posted by SkyBound
I would run 4.30s on a diesel and put 44in tires on it. But that's just me.
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Just as a reference, ford uses 4.30s stock with the 6.7L powerstroke in the F450, that's over 40,000 lb gross when paired with the diesel, just shows ya difference between gas and diesels
Sent from my SM-G930V using Tapatalk
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2016 jayco eagle 339flqs, 06 F250 CCLB, STUDDED and FIXED, Pmax turbo, geerhead tunes, B&W Companion, Firestone bags
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07-03-2017, 02:47 PM
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#48
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Senior Member
Join Date: Jan 2012
Location: Lander, Wyoming
Posts: 607
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We have a 2012 D/A combo with a six-speed Allison transmission and a 3.73 rear end. Had a 2011 Dodge Ram diesel with six-speed manual and a 3.42 rear end and, after nine months, traded it for the GMC. Just couldn't get used to the manual and lack of oomph compared to the GMC I had before with the same ration, 3.73. Perhaps it was just a question of getting used to driving a manual, but even with the 3.42 the Ram sucked at gas mileage and really bogged down when trying to tow my FW and Crestliner boat.
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2012 GMC 2500HD D/A Crewcab
2012 Jayco Eagle SuperLite HT 26.5 RLS
2009 Crestliner Superhawk 1900
2013 Polaris Sportsman 550 EXP
2008 Polaris Sportsman 700 X2
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07-03-2017, 05:20 PM
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#49
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Senior Member
Join Date: Sep 2016
Location: Gillsville
Posts: 375
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Quote:
Originally Posted by jal0710
We have a 2012 D/A combo with a six-speed Allison transmission and a 3.73 rear end. Had a 2011 Dodge Ram diesel with six-speed manual and a 3.42 rear end and, after nine months, traded it for the GMC. Just couldn't get used to the manual and lack of oomph compared to the GMC I had before with the same ration, 3.73. Perhaps it was just a question of getting used to driving a manual, but even with the 3.42 the Ram sucked at gas mileage and really bogged down when trying to tow my FW and Crestliner boat.
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Standard shift trucks are a completely different animal, no torque converter to aid in take off with the load, plus the boost you loose between shifts, and the fact that the power output of the Cummins hooked to a manual is substaintally lower than ones paired with the auto transmissions
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2016 jayco eagle 339flqs, 06 F250 CCLB, STUDDED and FIXED, Pmax turbo, geerhead tunes, B&W Companion, Firestone bags
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07-03-2017, 10:14 PM
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#50
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Senior Member
Join Date: Dec 2016
Location: Millington
Posts: 368
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What Gear Ratio is everyone running
Quote:
Originally Posted by JeremiahM
Standard shift trucks are a completely different animal, no torque converter to aid in take off with the load, plus the boost you loose between shifts, and the fact that the power output of the Cummins hooked to a manual is substaintally lower than ones paired with the auto transmissions
Sent from my SM-G930V using Tapatalk
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Stock modern manuals just don't compare either (and only Ram even offers one). I've got a tuned up 12 valve Cummins in a 95 Chevy 3500HD with a Fuller 6 speed that gives my 6.7psd a run for its money until it runs out of gear- but the pump is tuned so that it fuels and boosts hard right off throttle/idle. Of course it burns a little more diesel for it, but it still gets about 2 mpg more than the psd and the truck weighs about 1500# more
Sent from my iPhone using Tapatalk
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Rob, Sarah, Ella, Ava
2017 Eagle HT 29.5BHDS -- 2011 F350 CCSB 4x4 PSD
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07-11-2017, 07:48 PM
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#51
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Senior Member
Join Date: Jun 2016
Location: Mechanicsville
Posts: 1,479
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My F150 with the Heavy Duty Package as well as Max Tow came OEM with 3.73 rear.
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Erroll and Mary Doss and Duffy (RIP)
2018 Jayco Redhawk 22J
2014 F150 SC, 4x4, HD Pkg, Sterling Gray
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07-12-2017, 11:27 AM
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#52
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Senior Member
Join Date: Jun 2015
Location: --
Posts: 2,392
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3.55 here.
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2023 Ford F-150 XLT SCREW 3.5EB (Max Tow Pkg., Black Appearance Pkg., Bed Utility Pkg.)
1727 Payload / 4150 RAWR
On the sidelines taking it all in.
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07-20-2017, 08:16 AM
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#53
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Junior Member
Join Date: May 2017
Location: Williamston
Posts: 19
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Went with 3.31 on our F-150. Same gear ratio that is in our Expedition. We are happy.
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07-26-2017, 02:42 PM
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#54
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Junior Member
Join Date: Mar 2017
Location: Prospect
Posts: 18
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Well I appreciate all the responses. I have about 3500 miles on the new Ford F350, and I must say I don't notice the 3.55 gears at all. The 6.7l motor has all the power I need and has made towing effortless.
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07-26-2017, 03:00 PM
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#55
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Senior Member
Join Date: Jul 2015
Location: Rio Rancho
Posts: 426
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2015 F450 only choice available still 4.30. 9.5 MPG pulling a heavy Seismic 4212
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07-26-2017, 03:58 PM
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#56
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Senior Member
Join Date: Feb 2016
Location: Fort Wayne
Posts: 105
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What Gear
2017 Ford F 250 SRW LB 430 gear 6.2 gasser, Pulled the Smokies dropped 1 gear 10 Mpg pulling our 2016 28.5 RSTS HT, Sweet spot was 64 mph
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2016 Eagle HT RSTS
2017 FORD F 250 XLT LB 4X2 6.2 Gasses
430 Gears
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07-27-2017, 04:04 PM
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#57
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Junior Member
Join Date: Jul 2017
Location: Smithfield
Posts: 14
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2017 Titan XD 5.6l gas, 3.55
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07-27-2017, 05:10 PM
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#58
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Member
Join Date: Mar 2017
Location: DeBary, FL
Posts: 60
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My 04 F350 dually has a 4:10 rear gear and it works well for our Seismic 4212.
Rob
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2017 Seismic 4212
2004 F350 DRW CC XLT
EGR Delete, SCT X4 tuner, Blue Spring Upgrade
7.3 Fan clutch upgrade, Mishimoto coolant filter
Airlift bags on rear
Reese 20K hitch
2005 H-D Screamin Eagle (Banana)
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07-27-2017, 05:44 PM
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#59
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Senior Member
Join Date: Jun 2017
Location: Dallas
Posts: 365
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Quote:
Originally Posted by sean_cj7
Looking at new trucks, mainly left over 2016 Ford F-350's with the 6.7l. And what I'm seeing is a lot of 3.55 gear ratios. I'm currently driving a 2000 F350 with the 7.3l and have 3.73 gears. Mine is ok for towing, but a never considered going to higher gears like 3.55. What is everyone's experiences.
Thanks
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New to the subject myself but here's what I had and have now:
* 2015 Ford F150 XLT 3.5L TT, auto, 4x4 SCREW standard bed w/3.55 and max tow package. I believe it was rated upwards of 10,700lbs towing w/1,700lbs payload.
* 2017 Ford F250 XLT 6.2L, auto, 4x4 SCREW LB w/3.73 and towing rated around 12,300lbs with 3,000lbs payload.
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Let's go camping!
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