Jeep Wrangler 392 XR 37’ tires

Ron392 · Aug 29, 2023

Greetings you’ll, I had a question. Has anyone installed 37’ tires on their Jeep Wrangler 392 XR using the factory rims without any adjustments or modifications to their bumper or wheel wells. I’d like to upgrade my 35’ tires for 37’ BF Goodrich AT. Also will the tire fit the rear gate without any issues. Can you adjust the 3rd break light as well. Thank you

Fast-n-Furious · Aug 29, 2023

37” tires

Will 37” tires fit on the stock 2” lift without rubbing? Thinking mud.

www.jeep392.com

37’s on stock Xtreme Recon

I know they’re a lot of threads on 37 inch tires on stock high 392 and I see that the only issue with rubbing is on the lower control arms. With wheel spacers help this? Anyone with an XR run 37’s on stock height?

www.jeep392.com

37s on 392xr. Lift needed?

Can you wheel with 37s on xr package using stock rims without rubbing? Haven't seen this definitively answered 37x12.5 km2 Or ko2 for on road

www.jeep392.com

dblplay1212 · Aug 30, 2023

Ron392 said:
Greetings you’ll, I had a question. Has anyone installed 37’ tires on their Jeep Wrangler 392 XR using the factory rims without any adjustments or modifications to their bumper or wheel wells. I’d like to upgrade my 35’ tires for 37’ BF Goodrich AT. Also will the tire fit the rear gate without any issues. Can you adjust the 3rd break light as well. Thank you

Slap the 37's on it and drive it like you stole it. No issues unless you're doing pretty serious offroading.

badidea2.0 · Aug 31, 2023

BFG 37 AT or MT no issues driving or on the tailgate. You can wheel as well. Might rub a little in the inner fenders but nothing big.

CAMEL2R · Aug 31, 2023

Ron392 said:
Greetings you’ll, I had a question. Has anyone installed 37’ tires on their Jeep Wrangler 392 XR using the factory rims without any adjustments or modifications to their bumper or wheel wells. I’d like to upgrade my 35’ tires for 37’ BF Goodrich AT. Also will the tire fit the rear gate without any issues. Can you adjust the 3rd break light as well. Thank you

I've looked at this too... the XR wheels are 17x8.0 and the 37x12.5R17 KO2's are designed to fit a 17x8.5 wheel minimum. I'm not saying it's impossible, it's just something to think about. The section width for a 315/70R17 is 12.7" compared to the 37x12.5R17 at 12.5" so you should be good there. You may need add an adaptor to raise the spare up a bit.

badidea2.0 · Aug 31, 2023

You just need to raise the 3rd brake light by moving it up one bolt hole and should be good.

Jaaack · Aug 31, 2023

Just did 37 KO2’s on non XR stock wheels. Added the Mopar spare adapter and deleted the third brake light bracket and added the Jeep grill 3rd brake light kit that mounts in the center of the spare. No lift or any suspension mods… YET. but they are coming. No issues whatsoever.

84jeepjohn · Aug 31, 2023

CAMEL2R said:
I've looked at this too... the XR wheels are 17x8.0 and the 37x12.5R17 KO2's are designed to fit a 17x8.5 wheel minimum. I'm not saying it's impossible, it's just something to think about. The section width for a 315/70R17 is 12.7" compared to the 37x12.5R17 at 12.5" so you should be good there. You may need add an adaptor to raise the spare up a bit.

Right on BFG's site for the 37X12.5 X17 the rim widths are both 8" to 11" Min/Max.

CAMEL2R · Aug 31, 2023

I stand corrected...I could of swore that was 8.5 min when I had looked awhile ago. That is great news!

Nuke_1 · Sep 5, 2023

37x12.5x17 BFG's on stock 392 no spacers, no bump stop adjustments no issues. Keep in mind it has not been off road, but it's perfectly fine on road.

Fast-n-Furious · Sep 5, 2023

Nuke_1 said:
37x12.5x17 BFG's on stock 392 no spacers, no bump stop adjustments no issues. Keep in mind it has not been off road, but it's perfectly fine on road.

Did you need adjust the speedo with Tazer for tire size?

Nuke_1 · Sep 5, 2023

Fast-n-Furious said:
Did you need adjust the speedo with Tazer for tire size?

I used the JScan app and the vgate linker

https://www.amazon.com/dp/B088LW211V?ref=ppx_yo2ov_dt_b_product_details&th=1

I did put the extension cable on because it's a total PIA to get to the security module so one was enough!

Fast-n-Furious · Sep 5, 2023

Nuke_1 said:
I used the JScan app and the vgate linker

https://www.amazon.com/dp/B088LW211V?ref=ppx_yo2ov_dt_b_product_details&th=1

I did put the extension cable on because it's a total PIA to get to the security module so one was enough!

Thanks for the information. That's one reason that I hesitate to go big with 37" since I don't want to use any of these programmers/apps. They can be handy for certain things, I want to keep things simple and don't want to mess up with the computer. Maybe I'll have to down the road if I decide to go up with 37'.

Nuke_1 · Sep 5, 2023

Fast-n-Furious said:
Thanks for the information. That's one reason that I hesitate to go big with 37" since I don't want to use any of these programmers/apps. They can be handy for certain things, I want to keep things simple and don't want to mess up with the computer. Maybe I'll have to down the road if I decide to go up with 37'.

The JScan isn't too bad you do have to spend a few bucks to make it work. The XR package looks awesome the way it is. I found a heck of a deal on the 37's and sold the 315's with 0 mi. I probably won't be off road at least not anytime soon, If that changes there will be a lot of changes made due to lifting and adding 38's! So I like the driveability now. Just to let you know the 37's actually measured at 35 with 32 PSI on the gauge, 35psi on the dash. So the BFG's do run small. When I changed the size in the computer it did shift better, i've been contimplating changing it to a little taller to see if I can get it into 8th gear sooner.

CAMEL2R · Sep 5, 2023

Has anyone upgraded to 37's using the Clayton 392 Performance Coil Package?

stumblinhorse · Sep 5, 2023

Fast-n-Furious said:
Thanks for the information. That's one reason that I hesitate to go big with 37" since I don't want to use any of these programmers/apps. They can be handy for certain things, I want to keep things simple and don't want to mess up with the computer. Maybe I'll have to down the road if I decide to go up with 37'.

The JScan is the simplest way to adjust TPMS and tire size. You just unplug and plug in The bypass cable and attach the BT reader. Change settings in 4 places and then unplug. Nothing to marry or mess with screens etc.

@WhiteBronze392 · Sep 5, 2023

CAMEL2R said:
Has anyone upgraded to 37's using the Clayton 392 Performance Coil Package?

Yes many on here have. They are great.I am actually on the coils and Fox DSC with a fender chop and 38” ridge grapplers

Fast-n-Furious · Sep 5, 2023

stumblinhorse said:
The JScan is the simplest way to adjust TPMS and tire size. You just unplug and plug in The bypass cable and attach the BT reader. Change settings in 4 places and then unplug. Nothing to marry or mess with screens etc.

Thanks! Yes I've been ignoring the low tire pressure alert... The speedo/gps adjustment with bigger tires is definitely something I don't want to ignore.