Have any CRD drivers who changed to 4.10 gears had the computer changed to reflect the ratio change?

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Mail Rated 2005 Red CRD Sport with large rectangular hole in top right behind the EVIC and above the heated leather seats.
2004 Jetta TDI

Gear ratio does not matter for the speedo on a KJ,only tire diameter effects it.

A DRBIII(2005) or a Starscan(2006) will be needed to program new revs/mile, the BCM and the ABS will both need to be programmed with the new revs/mile.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

I've done nothing beyond the installation and I've had no problems.

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2006 CRD http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.

The crown gear can only rotate 1:1 with the wheel itself, as the rear speed sensor is reading flags on the crown 1 rotation is still 1 rotation regardless of how many teeth the gear has, so as far as the car knows basically there is no difference. Only a change in wheel Diameter effects the ECU. You can get a "Pinion Reset" done at some stealerships, they change the figure for revs - per - mile, in early models and in later models they choose a tyre size.

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SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

If gear changes don't change the speedometer then where does the speedometer get its information for how fast you are going, since most speedometers have their sending unit in the transmission? So if I change my 3.73 to 4.10 while running my 32's I won't need to recalculate my speedometer?

They get it from a wheel sensor on the rear axle i believe. basically you tell the computer you are running bigger tires and it changes its reading as so.

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06 CRD limited
Frankenlift, JBA 1/4 top plate, 3 clevis rings, 3 stacked iso's
JBA UCA and quick disconnects
Procomp rockkrawlr 16x8 4.25bs with 265-70-65 General Grabber AT2's
Mopar full skid plates, JCR stage 3 Rock Rails
Kenwood HU, 6.5 pioneer marine grade door speakers, JL stealthbox kenwood amp
GDE HOT tune
Soon to come
RL Rock monitor bumper

On the '06, the four ABS wheel sensors send the signal to the BCM. The '05 uses the front ABS wheel sensors and a sensor in the rear differential.
Most of the older rear wheel drive rigs with mechanical speedometers/odometers measured the speed and distance by the rear drive shaft, that is why you had to have a new box or have the little plastic gear in the back of the trans swapped out. With the electronic speedometer/odometer that measures the turns of the wheels, changing your axle ratio makes no difference.
Put on bigger tires, then you need the BCM reset for your new size tires.

For me, the 215 85 R16 tires corrected my speedometer error and I multiply by 1.115 to correct the odometer reading when I do my mileage calculation or file my expense account for miles traveled.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

An '05 gets the odometer signal from the rear speed sensor. When it is disconnected, the speedometer still works as well as the cruise control, but no odometer. I don't know whether the speedo gets its signal from a front wheel speed sensor or off the transmission.

DOC

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP