37" tires with 4.10 for those who do have
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
Here is the spacer with bolts: http://www.nitro-gear.com/GM-9-25-AAM-9 ... rg925a.htm
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
With 37s, there is only a 100 RPM difference between 4.88 and 5.13 at 70mph. 5.13 with 40s is roughly the same as 4.10 with 33s.
- OffroadTreks
- Moderator
- Posts: 2409
- Joined: Fri Mar 25, 2016 11:23 am
- Model Year: 2015
- Location: USA
- Contact:
Re: 37" tires with 4.10 for those who do have
Did you make your final decision yet? The extra UMPH with 5.13's and 37's before going to 40's is kind of appealing.Reloaderguy wrote: ↑Mon Jul 02, 2018 1:52 pmWith 37s, there is only a 100 RPM difference between 4.88 and 5.13 at 70mph. 5.13 with 40s is roughly the same as 4.10 with 33s.
But, overall, here is what I got from an online calculator
4.10 stock & 33's
2713.45 RPM @ 65mph
4.88 & 37's
2880.52 RPM @ 65mph
5:13 & 37's
3028.09 RPM @ 65mph
Now add 40's and
5.13 & 40's
2800.98 RPM @65mph
----
5.13's seem like a perfect fit for 40's. And maybe... maybe a FUN fit for 37's over 4.88 if you don't mind the higher RPM's
Anyways, that was just a calc on Summit, so take that accuracy with a large grain of salt.
2015 Power Wagon Laramie - "ROCKLANDER"
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
I got a little different numbers but they're still close. Yeah, 5.13s it is. The RPM difference is more critical for diesel applications.
Re: 37" tires with 4.10 for those who do have
If you’re going 40’s you’d be far better served by 5.38’s
Central Texas and Houston area
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
God damn it!
- OffroadTreks
- Moderator
- Posts: 2409
- Joined: Fri Mar 25, 2016 11:23 am
- Model Year: 2015
- Location: USA
- Contact:
Re: 37" tires with 4.10 for those who do have
Can you even get 5.38's for our gen though?
2015 Power Wagon Laramie - "ROCKLANDER"
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
Yes. I'm still going to use 5.13. I'm sure 5.38 would be better in party mode but 5.13 has OE gear sets available and I'm going to error on highway streetability.
-
- 250_Posts
- Posts: 315
- Joined: Fri Jan 05, 2018 11:32 am
- Model Year: 2018
- Location: Las Vegas, NV
Re: 37" tires with 4.10 for those who do have
I'm not sure what transmission you used in your calculations but those RPMs cant be right.MikeKey wrote: ↑Mon Jul 02, 2018 2:54 pmDid you make your final decision yet? The extra UMPH with 5.13's and 37's before going to 40's is kind of appealing.Reloaderguy wrote: ↑Mon Jul 02, 2018 1:52 pmWith 37s, there is only a 100 RPM difference between 4.88 and 5.13 at 70mph. 5.13 with 40s is roughly the same as 4.10 with 33s.
But, overall, here is what I got from an online calculator
4.10 stock & 33's
2713.45 RPM @ 65mph
4.88 & 37's
2880.52 RPM @ 65mph
5:13 & 37's
3028.09 RPM @ 65mph
Now add 40's and
5.13 & 40's
2800.98 RPM @65mph
----
5.13's seem like a perfect fit for 40's. And maybe... maybe a FUN fit for 37's over 4.88 if you don't mind the higher RPM's
Anyways, that was just a calc on Summit, so take that accuracy with a large grain of salt.
With stock gearing and stock tires in my 2018, my RPMs at 65mph were 1800.
With stock gearing and 37's tires, my RPMs at 65mph (via gps) are 1500.
Live: Las Vegas NV, Drive: 2018 PW & 2014 LR4
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
http://www.grimmjeeper.com/gears.html
4.10 w/ 33
Road RPMs at given speed in miles per hour
Gear
10
35
65
1 1348 4719 8764
2 764 2674 4966
3 589 2060 3826
4 417 1461 2713
5 338 1183 2198
6 259 906 1682
5.13 w/37
Gear
10
35
65
1 1505 5267 9781
2 853 2984 5541
3 657 2299 4270
4 466 1631 3028
5 377 1321 2453
6 289 1011 1877
4.10 w/ 33
Road RPMs at given speed in miles per hour
Gear
10
35
65
1 1348 4719 8764
2 764 2674 4966
3 589 2060 3826
4 417 1461 2713
5 338 1183 2198
6 259 906 1682
5.13 w/37
Gear
10
35
65
1 1505 5267 9781
2 853 2984 5541
3 657 2299 4270
4 466 1631 3028
5 377 1321 2453
6 289 1011 1877
Re: 37" tires with 4.10 for those who do have
Tire size to gear ratio calculators are very useful tools, BUT, they fail to take weight into consideration.
My tire/wheel combo comes in at about 140-150 pounds with 37x13.50r17 toyo mt’s and Hutchinson’s.
I have 5.13’s a high stall converter and a built transmission, I still sometimes wish I’d gone deeper with the gearing. It’s pretty damn quick for such a big and heavy gasser and it tows reasonably well up to about 8-10k but you can really feel the weight and rolling resistance of the bigger rubber. 40’s will be worse. 37 is 94 pounds and the 40’s are 104 pounds. My wheels are heavier than most but either way that’s a shit ton of rubber to push around.
Just sayin
My tire/wheel combo comes in at about 140-150 pounds with 37x13.50r17 toyo mt’s and Hutchinson’s.
I have 5.13’s a high stall converter and a built transmission, I still sometimes wish I’d gone deeper with the gearing. It’s pretty damn quick for such a big and heavy gasser and it tows reasonably well up to about 8-10k but you can really feel the weight and rolling resistance of the bigger rubber. 40’s will be worse. 37 is 94 pounds and the 40’s are 104 pounds. My wheels are heavier than most but either way that’s a shit ton of rubber to push around.
Just sayin
Central Texas and Houston area
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
- OffroadTreks
- Moderator
- Posts: 2409
- Joined: Fri Mar 25, 2016 11:23 am
- Model Year: 2015
- Location: USA
- Contact:
Re: 37" tires with 4.10 for those who do have
Agreed. As a guide only, because they all seem to vary.
2015 Power Wagon Laramie - "ROCKLANDER"
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
-
- 250_Posts
- Posts: 307
- Joined: Thu Oct 19, 2017 4:32 pm
- Model Year: 2018
- Location: Albuquerque
Re: 37" tires with 4.10 for those who do have
What model Hutchinson work best?
2018 White Rambox, Diamondback HD bed cover, White Knuckle sliders, Carli and Purple Cranium diff guards, masterpull 11mm superline, 37 Toyo MT.
Re: 37" tires with 4.10 for those who do have
Mine is a third gen. It’s the 5.28” backspace model. Not sure what would be optimal for a radius arm truck just off the top of my head though. Really great wheels.
Central Texas and Houston area
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
2009 5.7 auto quadcab
Carli 3” coils deaver leafs 3” kings with 4 tube bypass rear and fr/rr hydro bumps
Howe steering pump and gear with hydraulic ram assist
Custom tube bumpers and white knuckle sliders
Creative fab trussed axle. rem polished and cryoed 5.13 gears with arb lockers fr/rr
Sharadon stage 2 545rfe with 3000 stall edge converter
Lots of other stuff lol
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
Having now driven the truck with 5.13's and 37" tires I think you are probably correct. The 66RFE trans gearing is tall enough that 4.88 should be the factory gearing, not 4.10. 5.13's with 37's feels pretty good and will probably still be OK with 40's but 5.38's will never be too deep. The only downside is there aren't any OE gear sets available in 5.38.
- adeluca73
- 2000_Posts
- Posts: 2126
- Joined: Mon May 19, 2014 11:56 pm
- Model Year: 2014
- Location: The Pentagon, VA
Re: 37" tires with 4.10 for those who do have
That’s what she said ...Reloaderguy wrote: ↑Sun Jul 22, 2018 3:13 pmfeels pretty good and will probably still be OK, but 5.38” will never be too deep.
But seriously, I have a ½” worth of gear envy. This is sort of analogous to the 2.5” vs 3.0” front King debate. When do you hit the point of diminishing returns? Not sure, I know 2WAGs blew up his rear end with 5.13’s, who knows why, shit gear, bad install, lash errors, metallurgy failure, but I do know there’s less margin as you scale up tire size and scale up the ratio (down the gear size). 4.88’s were my comfort zone, pumped to see your 40’s crawling on those 5.13’s. Maybe I’ll get the itch again..,
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
Lee broke his front gears pulling someone in reverse. I don't think you can go too low gears with the larger tires. 5.38's are probably too low for 33" tires.adeluca73 wrote: ↑Thu Aug 16, 2018 10:06 pmThat’s what she said ...Reloaderguy wrote: ↑Sun Jul 22, 2018 3:13 pmfeels pretty good and will probably still be OK, but 5.38” will never be too deep.
But seriously, I have a ½” worth of gear envy. This is sort of analogous to the 2.5” vs 3.0” front King debate. When do you hit the point of diminishing returns? Not sure, I know 2WAGs blew up his rear end with 5.13’s, who knows why, shit gear, bad install, lash errors, metallurgy failure, but I do know there’s less margin as you scale up tire size and scale up the ratio (down the gear size). 4.88’s were my comfort zone, pumped to see your 40’s crawling on those 5.13’s. Maybe I’ll get the itch again..,
- OffroadTreks
- Moderator
- Posts: 2409
- Joined: Fri Mar 25, 2016 11:23 am
- Model Year: 2015
- Location: USA
- Contact:
Re: 37" tires with 4.10 for those who do have
I'm sold. I just gotta go to the secret Maple Base to get help with my gears and get a rear bumper built.
2015 Power Wagon Laramie - "ROCKLANDER"
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
-------
[Build Thread] [Instagram] [Youtube]
------
Full-Size Off-Road Events & Overland Adventures
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
2k RPM's at 70MPH seems perfect. I should have gone 5.38. It's not going to be a bust but 5.13 feels so good with 37's. Older trucks with the 545 is a whole different story.
- adeluca73
- 2000_Posts
- Posts: 2126
- Joined: Mon May 19, 2014 11:56 pm
- Model Year: 2014
- Location: The Pentagon, VA
Re: 37" tires with 4.10 for those who do have
Yep...as you’re upping the tire size, you gotta grow the gears to turn them, so the effective ratio by RPM at 65mph with 5.13 & 40’s, is about the same as 4:88 & 37/4:56 & 35/4.11 & 33 , about 2800RPM +-~5%.Reloaderguy wrote: ↑Thu Aug 16, 2018 10:13 pmLee broke his front gears pulling someone in reverse. I don't think you can go too low gears with the larger tires. 5.38's are probably too low for 33" tires.adeluca73 wrote: ↑Thu Aug 16, 2018 10:06 pmThat’s what she said ...Reloaderguy wrote: ↑Sun Jul 22, 2018 3:13 pm
feels pretty good and will probably still be OK, but 5.38” will never be too deep.
But seriously, I have a ½” worth of gear envy. This is sort of analogous to the 2.5” vs 3.0” front King debate. When do you hit the point of diminishing returns? Not sure, I know 2WAGs blew up his rear end with 5.13’s, who knows why, shit gear, bad install, lash errors, metallurgy failure, but I do know there’s less margin as you scale up tire size and scale up the ratio (down the gear size). 4.88’s were my comfort zone, pumped to see your 40’s crawling on those 5.13’s. Maybe I’ll get the itch again..,
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
That was my original train of thought. 5.13 w/ 40's is roughly equivalent to 4.88 w/37's. However, that makes the assumption that 4.88 w/ 37's is optimal. Now that I have hands on experience with 5.13 w/37's I would probably not go with 4.88 w/ 37's. I doubt I would yank out the 4.88 for 5.13 though.
- Bill2014
- 1000_Posts
- Posts: 1543
- Joined: Fri May 09, 2014 9:03 pm
- Model Year: 2014
- Location: Northern NY
Re: 37" tires with 4.10 for those who do have
If you only do work in the forward direction, it reduces to a question of optimization...
If backing something heavy up a winding hill in 4Lo is in the picture, I would think twice about the "weaker" gear set.
I've been in 4Lo reverse with the wheels taking turns breaking loose - stock gears - hoping I don't hear a snap and have things come to a grinding halt.
If it wasn't for the strength concern, I may have regeared even with the 33's. (for the way I use the PW)
On the other hand, the Power Wagons aren't high torque diesels so maybe it doesn't matter.
If backing something heavy up a winding hill in 4Lo is in the picture, I would think twice about the "weaker" gear set.
I've been in 4Lo reverse with the wheels taking turns breaking loose - stock gears - hoping I don't hear a snap and have things come to a grinding halt.
If it wasn't for the strength concern, I may have regeared even with the 33's. (for the way I use the PW)
On the other hand, the Power Wagons aren't high torque diesels so maybe it doesn't matter.
2014 Power Wagon Laramie
Titan V5 2.5" Receiver Pintle Hook
Warn wireless winch controller
.188" DOM White Knuckle Rock Sliders
Locker Bypass & Nanny Kill Switch
Moab 2006
Titan V5 2.5" Receiver Pintle Hook
Warn wireless winch controller
.188" DOM White Knuckle Rock Sliders
Locker Bypass & Nanny Kill Switch
Moab 2006
- Reloaderguy
- 2000_Posts
- Posts: 2193
- Joined: Tue Feb 09, 2016 8:06 am
- Model Year: 2016
- Location: Central Oregon
Re: 37" tires with 4.10 for those who do have
With 37's you're more likely to hear your transmission snap.Bill2014 wrote: ↑Fri Aug 17, 2018 8:51 amIf you only do work in the forward direction, it reduces to a question of optimization...
If backing something heavy up a winding hill in 4Lo is in the picture, I would think twice about the "weaker" gear set.
I've been in 4Lo reverse with the wheels taking turns breaking loose - stock gears - hoping I don't hear a snap and have things come to a grinding halt.
If it wasn't for the strength concern, I may have regeared even with the 33's. (for the way I use the PW)
On the other hand, the Power Wagons aren't high torque diesels so maybe it doesn't matter.
- olyelr
- 2000_Posts
- Posts: 3658
- Joined: Sun Dec 07, 2014 9:00 pm
- Model Year: 2016
- Location: Kewadin, MI
Re: 37" tires with 4.10 for those who do have
Bill2014 wrote: ↑Fri Aug 17, 2018 8:51 amIf you only do work in the forward direction, it reduces to a question of optimization...
If backing something heavy up a winding hill in 4Lo is in the picture, I would think twice about the "weaker" gear set.
I've been in 4Lo reverse with the wheels taking turns breaking loose - stock gears - hoping I don't hear a snap and have things come to a grinding halt.
If it wasn't for the strength concern, I may have regeared even with the 33's. (for the way I use the PW)
On the other hand, the Power Wagons aren't high torque diesels so maybe it doesn't matter.
I am on stock size tires as I think you are, and even with those I would like 4.56's, if not 4.88's. The trans gears are just so high.
When the jump to 37's comes I think I will go to 5.13's.
2016 Ram Power Wagon Laramie - Granite Crystal Metallic - Ramboxes - 35” AT3W - TazerRAM
- adeluca73
- 2000_Posts
- Posts: 2126
- Joined: Mon May 19, 2014 11:56 pm
- Model Year: 2014
- Location: The Pentagon, VA
Re: 37" tires with 4.10 for those who do have
Funny—all this talk of gearing and tires, at one point 4.88’s & 37’s were like the holy grail step-up for the Best-Gen trucks, put us on par or above with the ‘13 and older crowd who mostly gravitate to 35’s and keep their 4.56’s. Now the move is to 39/40” tires and 5.13’s—and I’ve been secretly discussing with my inner engineer the virtue of abandoning the 37” experience and moving down to lowly 35’s ( HUSH YOUR MOUTH) when these Nittos are doneolyelr wrote: ↑Fri Aug 17, 2018 3:24 pmBill2014 wrote: ↑Fri Aug 17, 2018 8:51 amIf you only do work in the forward direction, it reduces to a question of optimization...
If backing something heavy up a winding hill in 4Lo is in the picture, I would think twice about the "weaker" gear set.
I've been in 4Lo reverse with the wheels taking turns breaking loose - stock gears - hoping I don't hear a snap and have things come to a grinding halt.
If it wasn't for the strength concern, I may have regeared even with the 33's. (for the way I use the PW)
On the other hand, the Power Wagons aren't high torque diesels so maybe it doesn't matter.
I am on stock size tires as I think you are, and even with those I would like 4.56's, if not 4.88's. The trans gears are just so high.
When the jump to 37's comes I think I will go to 5.13's.
The unsprung weight difference, added driveline stress, and steep increase in rolling moment of inertia haunts my nerd alter-ego, but the cool kid in me wants 5.13’s and 40’s (STILL YOUR MIND, DONT LISTEN TO THOSE MOAB HERETICS AND GYPSIES, THEY’ll PILFER YOUR TREASURE AND PLUNDER YOUR TRUCK) so i war with my innersef, but i think 35’s and 4.88’s look pretty great for all around use....maybe a bit higher RPM at 75mph than I’d like, but I’ll take that over the fear of constant brake fade, and NO, I’M NOT INSTALLING HYDRO ASSIST STEERING, OR A BIGGER MASTER CYLINDER AND HIGH CAPACITY STEEL BRAIDED LINES—GET THEE BEHIND ME SATAN
Last edited by adeluca73 on Sat Aug 18, 2018 2:08 am, edited 1 time in total.