WHTRUBI2014

Brought my 2014 JKUR home on 10/7/13







My plans are:

LIFT
Front End -
EVO MFG LONG LCG BOLT-ON COILOVER KIT
w/ EVO SPEC COILOVERS
EVO HD SWAY BAR LINKS

Rear End -
EVO MFG LCG BOLT-ON COILOVER KIT
w/EVO SPEC COILOVERS
EVO HD SWAY BAR LINKS
EVO MFG DOUBLE-D LONG ARM UPGRADE KIT
JE REEL 1350 FRONT DRIVE SHAFT
JE REEL 1350 FRONT REAR DRIVE SHAFT


FRONT BUMPER
EVO FRONT 1/4 POUNDER JK FRONT BUMPER
EVO MFG STINGER FOR 1/4 POUND FRONT BUMPER
EVO WINCH FAIRLEAD
WARN 9.5TI WINCH

REAR BUMPER
JK REAR TIRE CARRIER
EVO REAR ROCKSKINS RAW
LED LIGHT SET FOR EVO REAR ARMOR

FENDERS
POISON SPYDER REAR CRUSHER FLARE
POISON SPYDER FRONT CRUSHER FLARE

SKIDS
EVO MFG JK COMPLETE SKID SYSTEM

STEERING
PSC RAM ASSIST - JK EXTREME DUTY
12" fuild cooler, heat sink type, 2 pass, alumium

GEARS
513 GEARS
AEV PROCAL MODULE

TIRES AND RIMS
5 NITTO TRAIL GRAPPLER 37/12.5/17
5 ATX STAB BEADLOCK WHEELS

WHTRUBI2014

My first addition! Thanks to my father and little Brother!

k0260

Welcome aboard the JK-Forum

Monte417

This thing is gonna look obnoxious lol

WHTRUBI2014

After giving this build more thought, I am thinking about going a different direction completely. More expedition style...

OH9JK

wow...that was fast

good luck with the build...whatever it ends up being

Tripletsi

5.13 gears for 37's on the new Pentastar? Did your Jeep come with the old 3.8 engine?!?

4.56 is standard, 4.88 would be above and beyond, 5.13 is just overkill.

planman

His rig is going to be heavy. The build is for rock crawling. Those 37s are full size. He will be driving mountain passes and hills in CA.

Compared to 4.88s, 5.13s will turn his engine about 130 rpm faster at 70 mph than it would with 4.88s.

Is 130 more rpm overkill?

If he has a manual, 5.13s would turn about the same engine rpm at 70 mph as 4.88s would in an automatic. Is almost 0 more rpm at 70 mph with a manual compared to an automatic overkill?

Building heavy, with large 37s, to do rock crawling, and to drive the hills and mountains around where he lives, 4.56s would be a poor choice.

5.13s result in about 300 rpm more than 4.56s at 70 mph. Going with 5.13s results in more power due to the extra 300 rpm on the highway, better crawl ratios when in 4Lo, and better fuel economy in mountainous and hilly terrain because the transmission does not downshift as frequently.

Tripletsi

^^^ planman, I thought he was going expedition style...? Usually that means a lightweight "green" build. I understand the need for low gearing, especially on rocks. But when traveling hundreds of miles across the country over-landing, I still believe 5.13 gears (5spd auto JKU) is still over-kill for an expedition build.

However, if it is going to be a heavy expedition Jeep, I'll agree with you that 4.88 would be the better choice over the 4.56 gears.

planman

I did miss that post.

Expedition style is actually heavier and less aerodynamic--cargo racks, trailers, water tanks, extra gas containers, portable fridges and rooftop tents, etc.

The in the end, how much time will he spend over 70-75 mph, hand ow heavy will he carry or tow?

5.13s vs 4.88s are 130-136 rpm faster at 70 mph--depending on tranny type.

The economy lost by those extra 130-136 rpm on the highway results in better performance and economy in town and off road.

My bias is nearly always performance is more important than a minor improvement in freeway economy.

Another way to look at it: an automatic 12' with 37s and 4.88s with mud terrain tires will get worse freeway speed mpg than it would with 5.13s and all terrain tires.

The mud terrains result in about a 2 mpg drop over all terrains. An extra 130 rpm won't result in even a 1 mph drop at 70 mph.

Anyway, this is why he is likely considering 5.13s with 37s.

If he lived in Florida or Texas, traveled regularly at 80-85 mph, was light and aerodynamic, and didn't rock crawl, the 5.13s wouldn't be as much of an extra value compared to living in SoCal, running the Rubicon trail, wheeling at higher elevations, and driving hills and mountains in CA.