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Old 11-17-2018, 07:07 PM
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37's with 3.6l, 6 speed and 3.73's

Wanting some feedback on this set up. Plan on upgrading axles in the near future but I really need new tires now and they are not much more in 37" than 35" I would rather buy tires once. How does it drive on the road? MPG get really bad? I get about 18 mpg with 35's. Any feedback would be helpful.

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Old 11-17-2018, 07:17 PM   #2
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Your current set up is inadequate, stick with 35s.
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Old 11-18-2018, 05:55 AM   #3
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Originally Posted by rcr1340 View Post
Wanting some feedback on this set up. Plan on upgrading axles in the near future but I really need new tires now and they are not much more in 37" than 35" I would rather buy tires once. How does it drive on the road? MPG get really bad? I get about 18 mpg with 35's. Any feedback would be helpful.
I rode on 37s with 410s for over a year on my 6 speed. I was still able to use 6th on the highway once I got past 60 65 mph. Much better with the 488s though and slow speed crawling is night and day. Yes I have a 3.6
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Old 11-18-2018, 09:15 AM   #4
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Thatís a lot of tire for your gearing. Just finishing up an axle swap on my MT JKU, 5.13 on 37s and itís just right.
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Old 11-18-2018, 09:54 AM   #5
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MyOP.. 33s--35s--37s-- 1 inch improvement in Ground Clearance with each step up.. How much, What type off roading is in your plan would be a big factor on the step up and $$ to keep DD performance satisfactory.
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Old 11-18-2018, 11:30 AM   #6
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Originally Posted by rcr1340 View Post
Wanting some feedback on this set up. Plan on upgrading axles in the near future but I really need new tires now and they are not much more in 37" than 35" I would rather buy tires once. How does it drive on the road? MPG get really bad? I get about 18 mpg with 35's. Any feedback would be helpful.
When I bought my 2018 JKU in May, I put 37s on it with 3.73 gears. Mine is an auto, and it was very sluggish with 37s. After the I put the new Dana 44 up front and re-geared the rear Dana 44 to 4.88 it is much better, still downshifts to 5th on decent grades if I have the cruise set to 70, but I didn't want to go 5.13 on this one. I don't drive it enough to tell you anything about MPG though.

With a 6 speed, I think you could expect to really feather the clutch/get the RPMs up on take off, and pretty much forget about 6th gear until you re-gear the axles.
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Old 11-18-2018, 12:04 PM   #7
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I have 4.10s and BFG 37's (35.5 measured out) with 6 speed. On the road is fine once you get used to it. Crawling off road is tough and I will upgrade but not in a rush. I'd imagine if you have 37's that measure out to 36" or slightly larger (any other non big 37) you might have more of an issue and want to rehear sooner.
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Old 11-18-2018, 04:33 PM   #8
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Yah that pretty sad when you have to buy a 37Ē tire to get a real 35Ē. Thatís why I like Pitbulls. True to size.


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Old 11-18-2018, 04:50 PM   #9
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Yah that pretty sad when you have to buy a 37” tire to get a real 35”. That’s why I like Pitbulls. True to size.


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My 37 inch bias rockers were 35.5 mounted on a 15x10 rim not under the Jeep with 20 psi . Most people get mad when the weight of the Jeep is on the tire and it's not as tall as advertised. If you don't measure the tire exactly how the manufacturer does off of a vehicle you will never get their measured size. There are to many variables in weight on different vehicles to please everyone anyway.

This is a 37 inch unmounted and mounted rocker next to 33 inch mtr kevlars on both other Jeeps. I bought them when looking for 35s due to it being known they measure small. The radials measure more true to size but not perfect. Remember also rim width plays a role in both width and height of a tire.
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Old 11-18-2018, 04:58 PM   #10
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I bought a 37 to get a rolling 36 at 26 psi. I expected 36 and thatís exactly what I got.
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Old 11-18-2018, 05:11 PM   #11
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Rocker radials are true ..
Iíve had both the 35 and 37s..
Worn 37x12.50x17 Rocker Radial compared to 37x12.50x17 Mastercraft MXT.
And a worn out 35Ē Pitbull compared to a new 37Ē both mounted.


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Old 11-18-2018, 05:20 PM   #12
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Rocker radials are true ..
I’ve had both the 35 and 37s..
Worn 37x12.50x17 Rocker Radial compared to 37x12.50x17 Mastercraft MXT.
And a worn out 35” Pitbull compared to a new 37” both mounted.


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I know the radial rockers are close to true like I stated. Pitbulls are all obviously not all like that.

The bottom pic is pointless, why post a bald tire and a new one. The 37 will obviously be bigger even if is wasn't bald.
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Old 11-18-2018, 06:52 PM   #13
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37's with 3.6l, 6 speed and 3.73's

Why... Because itís a huge difference and because I didnít have a photo of a comparison with new 35. Just like the comparison with a brand new Mastercraft and well worn 37 Pitbull.


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Old 11-18-2018, 07:21 PM   #14
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Why... Because it’s a huge difference and because I didn’t have a photo of a comparison with new 35. Just like the comparison with a brand new Mastercraft and well worn 37 Pitbull.


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Ah....

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