Just got the jeep back from the shop. Had it in for a whirring noise from the back, most obvious around 30MPH with accelerator pedal depressed 1/4 to 1/2 way. When I lift off the pedal the sound goes away. I was told I need new pinion bearings $850.00. I have 52K on the Jeep, 05 sport CRD. I change the diff using synthetic every other oil change and tow occasionaly, no off roading.

Anyone have a similar experience?

I was thinking I would like a limited slip diff as I have an open one now. I was going to try to find a used one. Is there a standard ratio for the CRD's? I know the diffs came in 3.55 3.73 & 4.10. Can I use one from a gasser?

Any help is appreciated!

05 had a 7/70 power train warranty. Are you the original owner? If not I believe the waranty is transferable to a second owner for a fee but it may have to be done in a certain amount of time.

Joe

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

No, I am the third. I already tried that. First owner had it for 20K, dad bought for daughter, second owner had it as a third vehicle for 10K, then I got it.

Bummer But that sounds like a lot of money. See if there's a transmission/differential shop, not automatic transmissions, in your area and get a quote from them. Your problem has happened before but is not real common.

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Drain the full synthetic gear oil out and add some regular old dino 85w-140 and never fear pinion bearing damage again.

It is the synthetic gear oil that is leading to early pinion bearing failures.

I have the Trac-Lok rear end (factory limited slip). I would trade you for your open rear. I'd rather have the open rear so I can upgrade it with a locker later.

To answer your question, all CRDs came with 3.73s from the factory. You can use a gear set from a gasser, but it will have to be one with 3.73s which was optional on the gas KJs.

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2005 Stone White KJ Limited CRD 4x4
Off-Road Pkg
Trac-Lok
Emu 790s/948s
Skyjacker H7088s rear/Bilsteins front
15x7 Black Rock Lobos/31x10.50 Firestones
GDE HOT Tune + TCM Tune
Euro TC
CB radio
Thrush Turbo muffler
AEM DryFlow filter

Why don't you like the LSD? I do not like the open diff in the rain, towing in the rain is even worse. You have to be very gentle on the go pedal.