Show off your Diesel JL build!

40”JLURD

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Ross
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2021 JL Unlimited Rubicon Diesel
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Bad Mother Fucker
Let’s see what everyone is doing to their Diesel’s. A pictures is worth a thousand words too so let’s share.

Here is a quick rundown of the major components on my build which is underway:

40x13.5xR17 Mickey Thompson Baja Boss wrapped around Trail Ready Beadlocks.

Ultimate Dana 60’s F&R w/ 4.88 & E-Lockers.

JE Reel F&R Custom Driveshafts

EVO/King Double ThrowDown up front EVO/King coil overs out back
EVO Pro High Clearance Long Arm Kit
King Hydraulic Bumpstops all around.


What setups are the other diesel guys running? Anyone with 40’s or bigger??

Please feel free to share gear ratios as well if you have re geared.

It would be awesome to see a MPG along with gear ratio & tire size from a few different builds.

Stock I was getting 27.3 MPG Highway going 80+/- mph





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Last edited:
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40”JLURD

40”JLURD

Well-Known Member
First Name
Ross
Joined
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Messages
540
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390
Location
Southern California
Vehicle(s)
2021 JL Unlimited Rubicon Diesel
Occupation
Bad Mother Fucker
  • Thread starter
  • Thread Starter
  • #2
EVO 1/4 Pounder w/Stinger

Baja Designs LP6 custom added by yours truly.

Custom Jet Black Powdercoat, Satin Finish
2EB81EEE-B09E-47E6-A8E7-B76B25E4FAD4.jpeg
B003DF2E-FD60-4D21-8E74-446B4CBC6AE8.jpeg
8DE2C0B6-B88F-4450-80CB-FDBDE502AB3B.jpeg
BDC25CC7-9F5D-4580-B779-894A4726C918.jpeg
 
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ItsNo4RE

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21 JLU Willys/17 Ram 1500
Let’s see what everyone is doing to their Diesel’s. A pictures is worth a thousand words too so let’s share.

Here is a quick rundown of the major components on my build which is underway:

40x13.5xR17 Mickey Thompson Baja Boss wrapped around Trail Ready Beadlocks.

Ultimate Dana 60’s F&R w/ 4.88 & E-Lockers.

JE Reel F&R Custom Driveshafts

EVO/King Double ThrowDown up front and EVO/King coil overs out back
King Hydraulic Bumpstops all around.


What setups are the other diesel guys running? Anyone with 40’s or bigger??

Please feel free to share gear ratios as well if you have re geared.

It would be awesome to see a MPG along with gear ratio & tire size from a few different builds.

Stock I was getting 27.3 MPG Highway going 80+/- mph
Damn bro! Are you sponsored? That's over 25k in parts alone! I should have my willys diesel in 2 weeks time and looking to regear as well to 4.88. Looking at 37s with a 3.5" lift. What drives hats did you go with?... nevermind, just saw that
 
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40”JLURD

40”JLURD

Well-Known Member
First Name
Ross
Joined
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Messages
540
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390
Location
Southern California
Vehicle(s)
2021 JL Unlimited Rubicon Diesel
Occupation
Bad Mother Fucker
  • Thread starter
  • Thread Starter
  • #4
Damn bro! Are you sponsored? That's over 25k in parts alone! I should have my willys diesel in 2 weeks time and looking to regear as well to 4.88. Looking at 37s with a 3.5" lift. What drives hats did you go with?... nevermind, just saw that
Nope I wish I was though lol - these parts are just the major ones. Tip of the ice burg really

you may want to consider 4.56 with 37” tires. That’s what a lot of guys have gone with in here and are super happy with them.

It’s still more aggressive than stock configuration would be at about a 4.11 effective gear ratio
 

ItsNo4RE

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Nope I wish I was though lol - these parts are just the major ones. Tip of the ice burg really

you may want to consider 4.56 with 37” tires. That’s what a lot of guys have gone with in here and are super happy with them.
Man, every time this debate comes up, there's always 1 or 2 that say 4.56 but the rest say 4.88... will the diesel compensate for that much more?
 
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40”JLURD

40”JLURD

Well-Known Member
First Name
Ross
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Southern California
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2021 JL Unlimited Rubicon Diesel
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Bad Mother Fucker
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Man, every time this debate comes up, there's always 1 or 2 that say 4.56 but the rest say 4.88... will the diesel compensate for that much more?
4.88 would be great for a gas motor. I’m going 4.88 with 40’s ...

I just ran this calculator for you so you can see what your speed would be stock vs with 37’s at 2,000 RPM

Stock you’d be going 76 MPH @ 2000 RPM
37 & 4.56 - 69 MPH
37 & 4.88 - 65 MPH

CDD90985-A583-4C50-AECA-D921A10A2C4B.jpeg


This is a handy web calculator to play with too, just make sure you use the actual mounted tire height. Not advertised height

https://www.intercotire.com/tire_size_change_gear_ratio_calculator
 

ItsNo4RE

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4.88 would be great for a gas motor. I’m going 4.88 with 40’s ...

I just ran this calculator for you so you can see what your speed would be stock vs with 37’s at 2,000 RPM

Stock you’d be going 76 MPH @ 2000 RPM
37 & 4.56 - 69 MPH
37 & 4.88 - 65 MPH

CDD90985-A583-4C50-AECA-D921A10A2C4B.jpeg


This is a handy web calculator to play with too, just make sure you use the actual mounted tire height. Not advertised height

https://www.intercotire.com/tire_size_change_gear_ratio_calculator
Beautiful, thank you
 
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40”JLURD

40”JLURD

Well-Known Member
First Name
Ross
Joined
Aug 20, 2020
Messages
540
Reaction score
390
Location
Southern California
Vehicle(s)
2021 JL Unlimited Rubicon Diesel
Occupation
Bad Mother Fucker
  • Thread starter
  • Thread Starter
  • #8
Beautiful, thank you
No problem! Enjoy!!

Im sure you’ll be fine either way but the 4.88 is going to put your RPM much higher at highway speeds in 8th. = Lower MPG

But the power would be great I’m sure
 

xtremejoe

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2021 JLURD (overlander), 2002 TJ (rock crawler), 2016 Porsche Spyder (track)
Who is doing your build and when do you expect it to be done?
Im trying to decide if on this one I do RK 3.5" mid arm on 37s or go straight to D60/40s long arm coilover. harder me as I already have a crawler and this build over the last month is overland. Just about done except suspension/tires which I'm doing last (reverse this time)
 
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40”JLURD

40”JLURD

Well-Known Member
First Name
Ross
Joined
Aug 20, 2020
Messages
540
Reaction score
390
Location
Southern California
Vehicle(s)
2021 JL Unlimited Rubicon Diesel
Occupation
Bad Mother Fucker
  • Thread starter
  • Thread Starter
  • #10
Who is doing your build and when do you expect it to be done?
Im trying to decide if on this one I do RK 3.5" mid arm on 37s or go straight to D60/40s long arm coilover. harder me as I already have a crawler and this build over the last month is overland. Just about done except suspension/tires which I'm doing last (reverse this time)
Don’t want to say who’s doing the build as I’m not happy with their service at all. Hopefully their build work is far superior to their customer service.

The cost of going D60/40’s plus long arm coilovers is extreme. I’m trying to build a sick rock crawler so I’m went big... I like the way 40’s sit on a 4 door JL.

If cost isn’t an overly burdensome factor for you though; it will provided about the same break over angle as a 2 door on 37’s which is excellent.

So if you can throw the whole wallet at it, then I say go for it! If throwing the whole wallet at it makes you think twice go 37’s lol
 

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