So a random thought popped in my head while stuck in traffic this evening, and I need some knowledge on my random thought. I know that with my 2012 if I go from stock to 35" tires the change in performance isn't noticeable. From what I've read 37" tires are noticeable, but not terrible. But what if a guy running the 5.7L Hemi and factory 4.56 gears did something crazy and went to 40" tires? I wonder what that would do to performance?
So those random thoughts lead to my question/thought. I know what 35's and 4.56 gears are like, but what would the gearing ratio be with 37" or 40" tires? I know that there's a spreadsheet calculator that I think Mogan put together before he bought his half ton Ram and disappeared, but I'm gear challenges so I thought I'd try to get everyone else's thoughts. Is 37" tires similar to 4.10's while 40's be similar to 3.73's?
While I don't have any tire change plans in the near future, my brain took me down this road today, and now I'm curious about what everyone else thinks?
Gears & Tires
-
04Ram2500Hemi
- 2000_Posts
- Posts: 2212
- Joined: Thu May 31, 2012 12:19 pm
- Model Year: 2012
- Location: Missoula, MT
Gears & Tires
Gone but Never Forgotten
2012 Ram Power Wagon: viewtopic.php?f=13&t=107
Truxedo Deuce Bed Cover with Bed Lights, Black Line-X Rocker Panel, Custom Built Rock Rails Sprayed with Line-X, Front & Rear Bumper and Grill sprayed with Line-X, Husky Mud Flaps, Husky Floor Mats, Four VisionX Xmitter Low Pro Prime XP LED Light Bars Behind the Grill, LED Lights Mounted in the Rear Bumper, Heated Seats, Interior LED Lighting, NAV-TV, Camera Mounted in Front Grill, Custom Headache Rack, AEV Raised Air Intake, AEV Salta HD Wheels in Onyx, 285/75/17 Cooper Discoverer AT3
2012 Ram Power Wagon: viewtopic.php?f=13&t=107
Truxedo Deuce Bed Cover with Bed Lights, Black Line-X Rocker Panel, Custom Built Rock Rails Sprayed with Line-X, Front & Rear Bumper and Grill sprayed with Line-X, Husky Mud Flaps, Husky Floor Mats, Four VisionX Xmitter Low Pro Prime XP LED Light Bars Behind the Grill, LED Lights Mounted in the Rear Bumper, Heated Seats, Interior LED Lighting, NAV-TV, Camera Mounted in Front Grill, Custom Headache Rack, AEV Raised Air Intake, AEV Salta HD Wheels in Onyx, 285/75/17 Cooper Discoverer AT3
Re: Gears & Tires
4.56 gears
37 tires = 4.06 ratio
40 tires = 3.76 ratio
37 tires = 4.06 ratio
40 tires = 3.76 ratio
2014 PW,4.88, White Knuckle Sliders, 315 70 17 KO2's
-
olyelr
- 2000_Posts
- Posts: 3657
- Joined: Sun Dec 07, 2014 9:00 pm
- Model Year: 2016
- Location: Kewadin, MI
Re: Gears & Tires
usmc369 wrote:4.56 gears
37 tires = 4.06 ratio
40 tires = 3.76 ratio
And just to add it in, the gear ratio/tire size graphs dont factor in the added rolling resistance of wider/heavier tires either.
2016 Ram Power Wagon Laramie - Granite Crystal Metallic - Ramboxes - 35” AT3W - TazerRAM
-
olyelr
- 2000_Posts
- Posts: 3657
- Joined: Sun Dec 07, 2014 9:00 pm
- Model Year: 2016
- Location: Kewadin, MI
Re: Gears & Tires
Here is one I pulled off of google...
- Attachments
-
2016 Ram Power Wagon Laramie - Granite Crystal Metallic - Ramboxes - 35” AT3W - TazerRAM
Re: Gears & Tires
The way I look at it is:
Stock (non-PW Ram) on stock tires with 3.73 gears (a pretty common ratio) has about 30" tires vs Power Wagon on 37s with 4.56 gears:
(37/30)x3.73= approximately 4.6 so, 4.56 gears are a dang near perfect correction for going from stock base Ram tires to a 37" tire size.
By the same logic:
(40/30)x3.73= approximately 4.97 so, 4.88 or 5.13 gears would be more appropriate.
Conversely, to compare the performance to a non-Power Wagon:
(30/40)x4.56= 3.42 which is actually a very common stock gear ratio for 30" or so tired stock trucks. So, from a purely diameter vs gear ratio standpoint, 40s on a 2012 Power Wagon would be fine! But, the doesn't take into account tire and wheel mass, rolling resistance, air resistance at speed, etc. That being said, every time it's time to get tires, 40s are more and more tempting for me, LOL!
Stock (non-PW Ram) on stock tires with 3.73 gears (a pretty common ratio) has about 30" tires vs Power Wagon on 37s with 4.56 gears:
(37/30)x3.73= approximately 4.6 so, 4.56 gears are a dang near perfect correction for going from stock base Ram tires to a 37" tire size.
By the same logic:
(40/30)x3.73= approximately 4.97 so, 4.88 or 5.13 gears would be more appropriate.
Conversely, to compare the performance to a non-Power Wagon:
(30/40)x4.56= 3.42 which is actually a very common stock gear ratio for 30" or so tired stock trucks. So, from a purely diameter vs gear ratio standpoint, 40s on a 2012 Power Wagon would be fine! But, the doesn't take into account tire and wheel mass, rolling resistance, air resistance at speed, etc. That being said, every time it's time to get tires, 40s are more and more tempting for me, LOL!
Re: Gears & Tires
When looking at the above chart, don't forget that it assumes a 1:1 ratio in the trans so, your final drive ratio for highway cruising will differ dramatically due to the double overdrive of the six speed auto!
-
04Ram2500Hemi
- 2000_Posts
- Posts: 2212
- Joined: Thu May 31, 2012 12:19 pm
- Model Year: 2012
- Location: Missoula, MT
Re: Gears & Tires
Thanks for playing along guys. Like I said, it was a random thought I had. The bummer with 2013 and older Power Wagons is I believe 4.56 is as low as we can gear our trucks. The 2015 up guys have more options. For some reason I like the idea of 37's and 4.88 gears, but that isn't an option for me.
Gone but Never Forgotten
2012 Ram Power Wagon: viewtopic.php?f=13&t=107
Truxedo Deuce Bed Cover with Bed Lights, Black Line-X Rocker Panel, Custom Built Rock Rails Sprayed with Line-X, Front & Rear Bumper and Grill sprayed with Line-X, Husky Mud Flaps, Husky Floor Mats, Four VisionX Xmitter Low Pro Prime XP LED Light Bars Behind the Grill, LED Lights Mounted in the Rear Bumper, Heated Seats, Interior LED Lighting, NAV-TV, Camera Mounted in Front Grill, Custom Headache Rack, AEV Raised Air Intake, AEV Salta HD Wheels in Onyx, 285/75/17 Cooper Discoverer AT3
2012 Ram Power Wagon: viewtopic.php?f=13&t=107
Truxedo Deuce Bed Cover with Bed Lights, Black Line-X Rocker Panel, Custom Built Rock Rails Sprayed with Line-X, Front & Rear Bumper and Grill sprayed with Line-X, Husky Mud Flaps, Husky Floor Mats, Four VisionX Xmitter Low Pro Prime XP LED Light Bars Behind the Grill, LED Lights Mounted in the Rear Bumper, Heated Seats, Interior LED Lighting, NAV-TV, Camera Mounted in Front Grill, Custom Headache Rack, AEV Raised Air Intake, AEV Salta HD Wheels in Onyx, 285/75/17 Cooper Discoverer AT3
-
olyelr
- 2000_Posts
- Posts: 3657
- Joined: Sun Dec 07, 2014 9:00 pm
- Model Year: 2016
- Location: Kewadin, MI
Re: Gears & Tires
Yeah I think you guys can get 4.88's, no? I know the 5.13's are out for you, but I think 4.88's are an option.04Ram2500Hemi wrote:Thanks for playing along guys. Like I said, it was a random thought I had. The bummer with 2013 and older Power Wagons is I believe 4.56 is as low as we can gear our trucks. The 2015 up guys have more options. For some reason I like the idea of 37's and 4.88 gears, but that isn't an option for me.
2016 Ram Power Wagon Laramie - Granite Crystal Metallic - Ramboxes - 35” AT3W - TazerRAM
-
adeluca73
- 2000_Posts
- Posts: 2173
- Joined: Mon May 19, 2014 11:56 pm
- Model Year: 2014
- Location: Mid-Michigan, MI
Re: Gears & Tires
hehehe---that's the plan....4.88's Check, 37's Soon.04Ram2500Hemi wrote:Thanks for playing along guys. Like I said, it was a random thought I had. The bummer with 2013 and older Power Wagons is I believe 4.56 is as low as we can gear our trucks. The 2015 up guys have more options. For some reason I like the idea of 37's and 4.88 gears, but that isn't an option for me.
SOLD : 2014 Ram PW SLT: (Flame Red) 1st year of the Best Gen
<Build Thread>
NEW : 2025 Ram PW SLT: (Flame Red) Last year of the Best Gen
Initial Mods:
<Build Thread>
NEW : 2025 Ram PW SLT: (Flame Red) Last year of the Best Gen
Initial Mods:
- Yokohama Geolander A/T4 35/12.5R/17LT
- Baja Squadron PRO Fog Light Kit
- CJC Front Skid
- Air Dam Delete
- Carli Front Diff Cover
- Purple Cranium Spider Rear Diff Cover
- Detloff Rear Sway Bar Spacer kit
- LED Bed Lighting Kit
- RAM OEM Fr/Rear rubber Splash Guards
- Bulletpoint RAM powered magsafe phone mount
- Refurbished my old Diamondback HD
- New linex
- 42” tool bar & muti-clamps
- DB’s Strip LEDs auto on/off kit
- New style locking kit
- New lock bar hardware kit
- New style tie down cleats - Garmin BT Power Switch Powering:
- Abel Electric Nanny KS
- BD S2 Pro x2 (Rear)
- KC Hi-lights LED puck lights in the engine bay
- Patton Fab Rear Light Mounts
- BD Squadron XL8100 Ditch Lights
- SDHQ Ditch Light Mounts
- F-55 Flatlink
- Diamondback HD
- RAM OEM Sil Plates x4
- Swing Cases x2
- F-55 2.5” Rear Hitch Recovery Point
- Rear Seat mounted 3x long gun case & storage pouches
- Muddy waterproof rear seat blanket cover
Re: Gears & Tires
I don't see where going from 4:56 to 4:88 will justify the cost, need a bigger jump than that. I've test drove a couple of new regular 4wd 2500's lately, 6.4L and CTD, regular cab and crew. They were all turds compared to mine on 37's with 4:56 and a good tune; with them on bone stock tires. Transmissions probably play a roll in it as well but damn they felt weak.
2010 with 37" hooves, controlled by numerous Thuren parts and Thuren Custom King 2.5's (Moved to a new home)
viewtopic.php?f=13&t=2333
I only do what the majority of the 4 voices in my head tell me to. In most cases, I ignore two of them because one doesn't speak English, and I suspect the other is talking to someone else.
viewtopic.php?f=13&t=2333
I only do what the majority of the 4 voices in my head tell me to. In most cases, I ignore two of them because one doesn't speak English, and I suspect the other is talking to someone else.
-
NovA ProspekT
- 50_Posts
- Posts: 165
- Joined: Tue Jan 05, 2016 11:53 am
- Model Year: 2007
- Location: New Hampshire - Live Free or Die
- Contact:
Re: Gears & Tires
THIS is one of the better calculators I've seen, gotta' enter your own numbers though.
With a quick calculation, 37's with 4:56 gears ~= 33's with 4.10 gears
2005-2013 Power Wagons have an AAM 10.5" rear axle, the tallest gear ratio currently available is 4.56:1. For some reason I remember a discussion over AAM releasing 4.88 or 5.13 gears, though I could be wrong.
2014-current Power Wagons have the larger AAM 11.5" rear axle, for which 4.88, 5.13 and 5.38 gears are available.
With a quick calculation, 37's with 4:56 gears ~= 33's with 4.10 gears
2005-2013 Power Wagons have an AAM 10.5" rear axle, the tallest gear ratio currently available is 4.56:1. For some reason I remember a discussion over AAM releasing 4.88 or 5.13 gears, though I could be wrong.
2014-current Power Wagons have the larger AAM 11.5" rear axle, for which 4.88, 5.13 and 5.38 gears are available.
2007 DODGE POWER WAGON: 5.7L Hemi V8/Auto, Quad Cab, Flame Red
- Spintech Super Pro Street 9000 Muffler, Electronic Exhaust Cutout, Transgo Shift-Kit
- COOPER S/T MAXX(37x12.5R17), Carli High Clearance Control Arms, Carli HD Ball-joints
- Aluminess Front Bumper, Back Rack w/ Side-rails, Truxedo LoPro QT Tonneau Cover
- JW Speaker TS4000 Driving Lights, Grote 30" LED Off-road Light Bar, Bosch Compact 100 Fog Lights
2004 JEEP GRAND CHEROKEE OVERLAND: 4.7L High Output PowerTech V8, Quadra-Drive, Inferno Red
- OME HD 1.5" Lift Coil Springs, Bilstein 5100 Shocks, JKS HD Trackbar, Core4x4 Tier4 Control Arms
- Nokian Hakkapeliitta 9 SUV(245/70R17) Winter Tires, 3" Exhaust w/ Magnaflow Cats/Y-Pipe & Muffler
- JW Speaker TS4000 Driving Lights, Hella 350 LED Wide Beam Light Bar
1998 JEEP GRAND CHEROKEE 5.9 LIMITED: 5.9L Magnum R/T V8, Quadra-Trac, Deep Slate Black
- H&R Sport Progressive Springs w/spacers(Stock height), Bilstein 4600 Shocks, OEM Euro Headlamps
- Doug Thorley Tri-Y Long-tube headers, MOPAR M1 Intake, BBK Power Plus twin 52mm Throttle Body
[My Flickr] - [Power Wagon Build Thread]
“The death-knell of the republic had rung as soon as the active power became lodged in the hands of those who sought, not to do justice to all citizens, rich and poor alike, but to stand for one special class and for its interests as opposed to the interests of others.” ~ Theodore Roosevelt
- Spintech Super Pro Street 9000 Muffler, Electronic Exhaust Cutout, Transgo Shift-Kit
- COOPER S/T MAXX(37x12.5R17), Carli High Clearance Control Arms, Carli HD Ball-joints
- Aluminess Front Bumper, Back Rack w/ Side-rails, Truxedo LoPro QT Tonneau Cover
- JW Speaker TS4000 Driving Lights, Grote 30" LED Off-road Light Bar, Bosch Compact 100 Fog Lights
2004 JEEP GRAND CHEROKEE OVERLAND: 4.7L High Output PowerTech V8, Quadra-Drive, Inferno Red
- OME HD 1.5" Lift Coil Springs, Bilstein 5100 Shocks, JKS HD Trackbar, Core4x4 Tier4 Control Arms
- Nokian Hakkapeliitta 9 SUV(245/70R17) Winter Tires, 3" Exhaust w/ Magnaflow Cats/Y-Pipe & Muffler
- JW Speaker TS4000 Driving Lights, Hella 350 LED Wide Beam Light Bar
1998 JEEP GRAND CHEROKEE 5.9 LIMITED: 5.9L Magnum R/T V8, Quadra-Trac, Deep Slate Black
- H&R Sport Progressive Springs w/spacers(Stock height), Bilstein 4600 Shocks, OEM Euro Headlamps
- Doug Thorley Tri-Y Long-tube headers, MOPAR M1 Intake, BBK Power Plus twin 52mm Throttle Body
[My Flickr] - [Power Wagon Build Thread]
“The death-knell of the republic had rung as soon as the active power became lodged in the hands of those who sought, not to do justice to all citizens, rich and poor alike, but to stand for one special class and for its interests as opposed to the interests of others.” ~ Theodore Roosevelt
Re: Gears & Tires
I looked into gears for a while and supposedly there is away to adapt 5.13s into a 10.5 but, I never could find concrete proof of it. Call it an unsubstantiated rumor I guess, LOL!
-
05PWrockcrawler
- 1000_Posts
- Posts: 1898
- Joined: Sat Mar 30, 2013 10:56 pm
Re: Gears & Tires
40" tires stock gears!
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
-
05PWrockcrawler
- 1000_Posts
- Posts: 1898
- Joined: Sat Mar 30, 2013 10:56 pm
Re: Gears & Tires
Sent from my iPhone using Tapatalk
-
Trouble Maker
- 50_Posts
- Posts: 157
- Joined: Sat Dec 21, 2013 8:21 pm
- Model Year: 2009
- Location: Lloydminster, SK
Re: Gears & Tires
I use that all the time. Just click on the drop down menus and pick a trans. You can also change the speeds and such on some of the charts to get different numbers for your own purposes.NovA ProspekT wrote:THIS is one of the better calculators I've seen, gotta' enter your own numbers though.
Russ
Black 09 purchased Dec 21/13
180K kms on the clock
Black 09 purchased Dec 21/13
180K kms on the clock
-
TwinStick
Re: Gears & Tires
People with the G-56, 6-speed manual trans, have less of an issue with tire size. 1st gear in the auto is 3.0:1. 1st gear in mine is 6.29:1. I actually bought/ordered the G-56 for that exact reason. If I ever put a lift & bigger tires, I have less of an issue with it.