As the title implies, is there an easy way to know what my axle ratio is?

CRD, of course, 05. I didn't see a tag on the axle. So, is there any other definitive test that does not involve jacking it up, or ???

If you do change between ratios, how is the speedo corrected?

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.

Stock gears? 3.73.

If not sure, pop that cover off and look for roll marks or count the teeth.

Gears dont affect the speedo.

The speedo on my 06 is 3 mph off (bigger tires). Not even worth spending the $90 bucks at the dealership to correct it.

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2002 KJ Limited 3.7, 5.25" lift via coilovers, custom HD rear springs, 32.2" tires on moabs (soon 33s) 4.56/JBA diff, OX lockers front/rear, NP241OR, Parker Fab front/rear bumpers, rock rails and roof rack, Viair OBA.

2006 KJ sport 3.7, 4" Ironman lift, 32" tires, Parker Fab front/rear bumpers and rock rails.

Search the forum.
I'm pretty sure all US spec CRDs came with the same axle ratio.

I believe it's 3.73.

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U.S. Army Retired

The reason I asked is:

This is what car-part.com says.

(Chrysler 8-1/4), 2.4L (4.10 ratio), from 4/19/05
(Chrysler 8-1/4), 2.4L (4.10 ratio), thru 4/18/05
(Chrysler 8-1/4), 2.8L (diesel), 3.55 ratio, from 4/19/05
(Chrysler 8-1/4), 2.8L (diesel), 3.55 ratio, thru 4/18/05
(Chrysler 8-1/4), 2.8L (diesel), 3.73 ratio, from 4/19/05
(Chrysler 8-1/4), 2.8L (diesel), 3.73 ratio, thru 4/18/05
(Chrysler 8-1/4), 3.7L, 3.55 ratio, from 4/19/05
(Chrysler 8-1/4), 3.7L, 3.55 ratio, thru 4/18/05
(Chrysler 8-1/4), 3.7L, 3.73 ratio, ABS, from 4/19/05
(Chrysler 8-1/4), 3.7L, 3.73 ratio, ABS, thru 4/18/05
(Chrysler 8-1/4), 3.7L, 3.73 ratio, w/o ABS; from 4/19/05
(Chrysler 8-1/4), 3.7L, 3.73 ratio, w/o ABS; thru 4/18/05
(Chrysler 8-1/4), 3.7L, 4.10 ratio, from 4/19/05
(Chrysler 8-1/4), 3.7L, 4.10 ratio, thru 4/18/05


And yes, they sometimes include european versions in their data. For instance, they show a 2.8 for the Nitro...

The reason I ask, is that something's going wrong with mine - it growls while turning to the right, when slowing down, that is, and has developed some whine.

I don't know what's wrong, though it sounds a little like bearings in the differential. Sadly, having anyone do any work on a differential will likely cost well more than just another differential.

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.

If your in the states your CRD has 3.73 gears,only choice.

Pwrwagon, the only test I know involves using a jack to lift whole axle, marking the pinyon, marking the rear wheel and moving the rear wheel till pinion has one revolution, if wheel moved 3.5-ish revolutions for one pinion revolution then it's 3.55, if to moved 3 and 3/4-ish revolutions its 3.73.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.