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2006 Escalade, 2002 Deville DTS
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depends on if your overall diameter of the tire..

a 305/40/22 size tire will have a different overall diameter than a 305/45/22, (stock 22's are 285/45/22)

a 295/40/24 size will have a different overall diameter than a 305/35/24

I used a Hypertech Power Programmer for my 2000 Escalade to adjust the speedo to my tire height. Different tire size combos have different overall diameters. Hypertech has a chart for sizing up programmers to your vehicle model and year. There are some others out there, that's the one I used though. I haven't gotten one for my newer 06, but I'll be looking into getting one sooner or later. Just my 2 cents.
 
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