Pathfinder III
I’m wanting to make the jump to 37s after I regear to 4.10. How do those running 37s carry a spare? The Baja style chase rack with two tires in the bed isn’t really practical for my needs.
37s on pickups
- Thread starter Salty4Life
- Start date
Enthusiast III
For my Ram 1500 I reached out to Expedition One. They said they’d have a version of their dual swing out rear bumper in the next couple of weeks. A little pricey, but the 2500 version will hold a 40” spare and 4 roto packs or 2 nato scepter cans.
I welded a 2 tire, swing out carrier 35 years ago for my F250. It also pinned to the tailgate when the tailgate was down...
this was with the stock 235/85R16s. I'm not sure why everyone buys everything.
this was with the stock 235/85R16s. I'm not sure why everyone buys everything.
Member III
Something to consider when Overlanding is the ability to purchase another tire, should you cut the side wall. Now you are out there with no spare, and finding another 37" tire will be much more difficult than a 35" tire, depending on where you are.
Enthusiast III
Member III
Right on the spare, I get that. However, as some in the Military would say; two is one and one is none. Having two spare 37" tires would be more ideal, based on just how difficult it would be to get another one, when out in the sticks. But, if money and time is no object, they could wait to have one shipped in on the next truck or two.
A rear swing arm makes the most sense. The roof rack sounds great, but 37's are not light. Imagine getting that tire down and putting a new one up there by yourself.
Member III
No kidding on the weight. I used to have 37" MTR tires on my '99 4Runner.
Those things are heavy. I can't imaging trying to get one of those off the roof of a vehicle. Not to mention, having that much weight up high, throws off your ability to side walk any trails. Actually any weight up high is no bueno for trail running.
Those things are heavy. I can't imaging trying to get one of those off the roof of a vehicle. Not to mention, having that much weight up high, throws off your ability to side walk any trails. Actually any weight up high is no bueno for trail running.
Enthusiast III
madcratebuilder
Rank V
Pathfinder I
Is 4.10 going to be enough gear? For 37's I would think 5.13's or more. I'm running 4.10's with 32+ and it's the sweet spot for my v6 truck.
Enthusiast III
Member III
Without knowing the model of the truck, or how many gears the transmission has, or the transfer case, it's really hard to determine if 4.10 would be good enough for 37" tires. If just driving around, I would think yes. But, when a rig is under load (gear in the truck or towing), then that is when careful gear selection comes into play.
I drive a Silverado, so I made a chart to help figure out gearing relative to tire size:
Tire Size / Gear Selector
hmmm, seems I need to fix something on the chart. It's been a few years since I messed with the chart. And, I can see somebody else is currently using the chart. If you see the numbers changing, somebody is plugging in the numbers...
Google thing
Ok, I think I got it fixed and working properly.
I drive a Silverado, so I made a chart to help figure out gearing relative to tire size:
Tire Size / Gear Selector
hmmm, seems I need to fix something on the chart. It's been a few years since I messed with the chart. And, I can see somebody else is currently using the chart. If you see the numbers changing, somebody is plugging in the numbers...
Google thing
Ok, I think I got it fixed and working properly.
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madcratebuilder
Rank V
Pathfinder I
I think about 90% of off roaders would disagree. Most current gen trucks with 37's run a 5 series gear, especially the Jeep and TRD crowd. With the new 8 and 10 speed trannies with double or triple overdrive you do not take a mileage hit like the old school rigs. My in town mileage picked up 2 mpg going from 3.42 to 4.10, the hiway mileage dropped 2 mpg. The increase in low speed off road ability more than made up for any added costs.
Enthusiast III
that might be true in the smaller trucks like you seem to have and have mentioned however with the transmissions on the full size trucks and especially the 2500 and up trucks like this sub forum is for that is not the case and 4.10s are just fine for most applications with 37s!
Member III
I dunno about that. there is general standard of power to weight ratio. I say general, as some vehicles such as the older Toyota 3.4 engines can be supercharged giving more power to weight than standard. But, most of our Full size rigs are well north of 6k pounds, with the 2500 rigs running over 7k pounds. That is a lot of weight to move, much less any gear that is in the truck. I would agree, that 4.10 is fine for tooling about town and occasional trail running, but in the long run, if you want to tow anything with a full size rig (as most full size rigs are designed to tow something large), I think the OP would be running into difficulty with 37" tires and 4.10 gears.
Just my personal opinion on it, nothing more.
Just my personal opinion on it, nothing more.
Pathfinder III
4.10s are definitely low enough for a heavy duty diesel with a 3 grand red line. Jeeps and Toyota’s probably would need lower gears because they have small motors, small trans, and small axles. Also the gas engines won’t mind the higher engine speeds. The truck came with ~34s and 3.42 gears stock, so 37s and 4.10s is going to be pretty close to stock.
Member III
Pathfinder III
Member III
ohhh, it's a torque monster. Why even ask about gearing?
Something else regarding your truck, if it came with 34" tires, those are definitely not stock tires. The largest tire the Ram trucks install on your 2018 model year are the 285/60R20, which equates to 33.5. You're already starting off under-geared for the truck's stated specifications.
Given that you have a large diesel engine, why re-gear, as you have stated in your first post?
Something else regarding your truck, if it came with 34" tires, those are definitely not stock tires. The largest tire the Ram trucks install on your 2018 model year are the 285/60R20, which equates to 33.5. You're already starting off under-geared for the truck's stated specifications.
Given that you have a large diesel engine, why re-gear, as you have stated in your first post?
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