38's - Are They the New 37?

[MudVayne]

I’m all for it. Oddly, my cooper 37x13.5s are already looking a smidge too small…. even though the day I put them on I was like hell yes!!.

yet, 40’s looks a tick too much with my modest 2.5ish lift…i’ll play the goldie lox card and hope cooper and nitto offer a few more options in some dirty8’s..

 

[Shadow's_Jeep]

I'm currently running 35's on a D-30, so 37's are out of question with changing to after market D-44. Let alone a 38.

 

[Marcus Davies]

It depends on the owner of the jeep to install either of these sizes. All of us have different preferences when it comes to the auto parts and accessories that we will install in our vehicles. I will still stick with 37' I am not planning to do some upgrade since I am happy with it.

 

[jorgelrod]

I was pumped for these 38s when you posted the video Eddie, but I'm finding $150 per tire premium over the 37s a hard pill to swallow

 

[wayoflife]

I was pumped for these 38s when you posted the video Eddie, but I'm finding $150 per tire premium over the 37s a hard pill to swallow

The price point is a legit drawback.

 

[desertrunner]

im running 37x13.50 coopers on my 2 dr and they already feel like a bear to push around with a 6 speed and no hydro assist. Im always paranoid about breaking stuff even with a pr44 and 35 spline rears. idk i feel like 38s are a market for people wanting to get the most out of their 44 axles and just personally i dont want to go any bigger on mine. I can see how they would be appealing on a 4dr but still IMO id rather go 1 tons and 40s i dont see the need to upgrade my coopers anytime soon without 1 tons.

 

[RubiWoo]

I would go 38's becasue my Toyo 37's measure 35.5 @ 30 PSI. With the 3.5" lift I have, the tires look small. After seeing Eddie go from 37's to 38's, the 38's looked much better.

 

[wayoflife]

I would go 38's becasue my Toyo 37's measure 35.5 @ 30 PSI. With the 3.5" lift I have, the tires look small. After seeing Eddie go from 37's to 38's, the 38's looked much better.

To be fair, NO tire measures as tall as what is stated on the sidewall. See link below.

The Ultimate TRUE TIRE SIZE Database

Before I get this started, it needs to be made clear that when it comes to things like lift kits and tires you can run with them, EVERY manufacturer, shop and person in the industry will always refer to what is written on the sidewall and NOT the true height of the tire. In other words, if a...

wayalife.com

And really, the only reason why my 38's look so tall is because they're only 12.50 wide. As in, they're pizza cutters and the skinny profile makes them "look" taller.

 

[Brute]

They were available after I sliced a 40” Cooper open on the sidewall…my only complaint is I’m at 3200 rpm at 70 mph on Brute with 5.38’s

 

[RubiWoo]

To be fair, NO tire measures as tall as what is stated on the sidewall. See link below.

The Ultimate TRUE TIRE SIZE Database

Before I get this started, it needs to be made clear that when it comes to things like lift kits and tires you can run with them, EVERY manufacturer, shop and person in the industry will always refer to what is written on the sidewall and NOT the true height of the tire. In other words, if a...

wayalife.com

And really, the only reason why my 38's look so tall is because they're only 12.50 wide. As in, they're pizza cutters and the skinny profile makes them "look" taller.

Idk, they still looked bigger. Maybe if we put your 38's on my JT then I could see for myself after 30-40,000 miles

 

[wayoflife]

Idk, they still looked bigger. Maybe if we put your 38's on my JT then I could see for myself after 30-40,000 miles

LOL - what look a LOT bigger are the 42's on our JT. Next to them, our 38's look like 35's.

 

[RubiWoo]

LOL - what look a LOT bigger are the 42's on our JT. Next to them, our 38's look like 35's.

My wallet is not deep enough for that

 

[2013rubirick]

I will definitely be putting 38’s on my 392 here in a couple months. Honestly 40’s to me make everything not a big challenge anymore. Like on the rubicon just point it and it will go. Don’t really have to pick your lines anymore. I’ve told multiple people they should start small to actually learn to wheel and pick the right line. I’ve thought about going away from 40’s because of it.

 

[Mike Pierson]

My wallet is not deep enough for that

What say you and I pool the cash and buy a set. I’ll run them for the first 30k miles to make sure we like them.

 

[RubiWoo]

What say you and I pool the cash and buy a set. I’ll run them for the first 30k miles to make sure we like them.

Well, it would be better to swap them every 3500 miles for proper wear

 

[desertrunner]

Currently debating this right now.
Gonna be purchasing 1tons soon which means new wheels and the thought of de mounting beadlocks and re mounting my cooper's sounds more annoying than just selling them as a mounted set and getting new tires. Not supper happy with the wear on my cooper's and plan to go nittos but given than I currently have 37x1350 and the trail grap in 37 is only 1250 I feel like it would be weird to buy a smaller tire after a 1 ton swap so the 38x1350 nitto trail grap is looking enticing right about now.
Not quite ready for the 40s on the suspension side and honestly a 2 Dr JK on tons and 38s I can't imagine really needing much more for a while

 

[LVMohave]

I have a '23 Gladiator Mojave with a 2" AEV spacer kit. I did the fender chop and have 38x12.5x17 Nitto Ridge Grapplers (I watched Eddie's video on the 38's!) with stock 4.10 gears. I do 80% around town driving and not much highway driving. I DO get into 8th gear on flat land or downhill (lol) but as soon as the road has an incline 8th is no longer effective. I did add a Banks Pedal Monster which gives the truck literally night and day throttle reponse difference. I have to admit when I go back to "stock" setting the truck feels like a pig. On "sport" mode the truck drives really nice. Every friend that has driven my Jeep was so impressed how well it drove on 38's with the Banks kit. Sometimes on the freeway it seems like the truck cannot decide to effectively change gears and I do it manually.

I have verified the speedo is correct (AEV has a speedo recalibration tool) do take the truck offroad, I stay on 4 rated trails and below at this time....need some skids underneath and considering an actual lift first if Im going to try a little more difficult trails. On pavement and the trails I have been on, I've had no rubbing issues inside fenders and I have a stubby front bumper. Of course I havent tried to maximize the flex out yet either. I AM debating on going to 40's, thats WHY I havent re-geard yet. Most likely I will just re gear to a 5.13 very soon because I know overall it's just better for my truck.

 

[wayoflife]

I have a '23 Gladiator Mojave with a 2" AEV spacer kit. I did the fender chop and have 38x12.5x17 Nitto Ridge Grapplers (12.5" wide, not 13.5") with stock 4.10 gears. I do 80% around town driving and not much highway driving. I DO get into 8th gear on flat land or downhill (lol) but as soon as the road has an incline 8th is no longer effective. I did add a Banks Pedal Monster which gives the truck literally night and day throttle reponse difference. I have to admit when I go back to "stock" setting the truck feels like a pig. On "sport" mode the truck drives really nice. Every friend that has driven my Jeep was so impressed how well it drove on 38's with the Banks kit. Sometimes on the freeway it seems like the truck cannot decide to effectively change gears and I do it manually.

I have verified the speedo is correct (AEV has a speedo recalibration tool) do take the truck offroad, I stay on 4 rated trails and below at this time....need some skids underneath and considering an actual lift first if Im going to try a little more difficult trails. On pavement and the trails I have been on, I've had no rubbing issues inside fenders and I have a stubby front bumper. Of course I havent tried to maximize the flex out yet either. I AM debating on going to 40's, thats WHY I havent re-geard yet. Most likely I will just re gear to a 5.13 very soon because I know overall it's just better for my truck.

Unless you're planning on installing 1-tons, the highest gear ratio I would recommend you run on stock axles is 5.13. So really, there's no need to wait on gears. 5.13 is the right ratio for 38's and I personally wouldn't recommend 40's on stock axles.

 

[LVMohave]

Unless you're planning on installing 1-tons, the highest gear ratio I would recommend you run on stock axles is 5.13. So really, there's no need to wait on gears. 5.13 is the right ratio for 38's and I personally wouldn't recommend 40's on stock axles.

ok- good to know. I do value your opinion based on your experience. Now I have to find a shop here in Las Vegas to do the work. I also plan on doing a RCV shaft and upgrading some front end parts as well for added peace of mind.

 

[wayoflife]

ok- good to know. I do value your opinion based on your experience. Now I have to find a shop here in Las Vegas to do the work. I also plan on doing a RCV shaft and upgrading some front end parts as well for added peace of mind.

I'm not sure what social media site you're getting all your recommendations from but please do yourself a favor, ask more questions and don't waste your money on things like RCV shafts. Sure, they're strong but they're way over priced, totally unnecessary and will snap and pop LOUDLY after hard use and they will tell you that it's totally normal. Trust me, I've run them on 3 different rigs and now back to running chromoly shafts with full circle clips.