Marry X-mas everybody!!

I recently installed an ARB air locker, replacing the limited slip in my rear diff.

The locker locks and works great, no funny sounds coming from the diff or anything,
but I have noticed an increase in fuel consumption.
Aprox 1 Lit/100 Km for my '05 2.4 export.

Is this normal?

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It only takes one man to place a trail..

It shouldnt be. When the locker is OPEN it in effect does not exist.

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2006 KJ CRD Ltd - Suncoast, GDE Eco, EGR Delete, After market T-Stat, Skid Row skids, V6 airbox, 2.5" Turbo back
2005 KJ CRD Sport-Suncoast, Transco, GDE Hot-GDE Trans, EGR Delete, Skid Row skids, V6 airbox, 2.5" Turbo back, After market S-Stat
1987 Suzuki LWB Samurai -diesel powered, custom 4 link coil suspension 38.5 SX Swampers

I know!!
So, it should theoretically contribute to a lower consumption...

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It only takes one man to place a trail..

Not unheard of when getting rid of the awful trashloc and going to a ARB as your not having any of the friction causing undue drag from the clutch based LSD when turning.The ARB when unlocked has no such added friction so you actually gain a tad bit of mpg's,it could also be due to new gear oil also.

Have you checked to make sure your ARB is not installed incorrectly and is actually engaged full time? Just asking.

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New KJ Gear - Desert Armor Flak

2004 Renegade Light Khaki - 4" JBA Lift - Rock Lizard Products: Komodo Dragon Rear Bumper, Prototype Winch-mount Front Bumper, Super Skink Sliders - All J's Super Tranny Skid II - 31" Firestone Destination AT's on Moab wheels - Cobra 75W CB w/ stock Antenna mod

[b]Retired, US Military

he's reporting the opposite, increase in fuel consumption

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03 Renegade (Black)
177k miles 3.7L gas - 45RFE
Command Trac / 4.10s
Lift: ft. 790+ rr. JBA4+
The last of the TrailReady Front&Rear Bumpers and TR Rock Rails
Jarhead Offroad light covers
31x10.5R15 RedLetter Grabbers on Blackrock Dunes
L.O.S.T #KD098632

Did you adjust pre-tension and backlash 100% to JEEP specs? (these do NOT come with the ARB install instructions, they refer to the FSM!)

If not..you could have to much tension on the diff bearings, so it rotates with dificulty. Or, there is to much pinion/gear contact pressure.

This won't go away by itself, will end up in destroying the bearings, (possibly diff), gear and pinion.

I'd doublecheck my settings.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Tokyojoe I'm sure that the ARB is locking, but how can I be sure it's a 100% lock?

Yeap! JeepinJarhead03 got it right it's an increase in fuel consumption alright.
I was expecting a slight decrease for the exact reasons mentioned by TJ.




I'm not sure it was 100% to jeep standarts, I dont recall the mecanic measuring before pulling the old diff out..

Point well taken... will have a look and see if I can locate the needed info in the FSM...

BUT.. checking will mean that I'll have to go back to the shop, re-open the diff and measure... right?

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It only takes one man to place a trail..

Just went throught the FSM
I don't think that I now posses have a definite knowledge of what the correct specs are..
I has hoping that I would find something clear like a specific number or chart or sthg to take with me to the shop.
Any help?

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It only takes one man to place a trail..

Yep..you will have to take the rear cover off.

Then measure.

But I would start all over again. Ask your mechanic if he adjusted the bearings in the right way...

There are several pages in the FSM about fitting a diff int the 8.25 rear axle.

Here's some of it. It's in chapter 3, differential&driveline.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es