I've never heard of the PCM's/ or Body Computers having that feature, the ability to change the speedometer ratio's or calibrating the speedo. It makes sense, it would be easy enough to do, just never heard of it before. You quoted a price, so it sounds like you checked it out and confirmed its a feature that is useable.
Talk with the dealer about future servicing and PCM updates and if you'll have to pay to have it reprogrammed again.
Originally Posted by LuvMyCommander
...I know that with a speedo calibrator it states that when I take in the Jeep for repair to the dealer the computer has to be reset to factory settings but if I get it reprogrammed at a dealer will that not be an issue?
This doesn't make sense to me, why would the Dealer do extra work of reseting you PCM everytime you have service when, if anything, it would be detrimental to the customer?
If you have your PCM re-flashed with new Software, I could see that reseting the PCM back to factory conditions. And, yes, they do release new versions of the PCM software to address minor problems, and often instruct the Dealers to do certain updates anytime the vehicle is brought into service. BUT, that is NOT a garuantee that everytime you bring the vehicle in for service they are re-flashing or reseting your PCM. It may be a case of just informing the service people before you drop it off, of course that might mean you have to choose between PCM updates or your Speedo calibration.
Find out if the Speedo Ratio is stored in Volatile or NON-Volatile Memory. If its in Volatile memory, anytime your battery goes dead or you disconnect your battery, it will dump the Speedo Settings. If its stored in NON-Volatile Memory, like the VIN# and Mileage, you don't lose those settings if power is interupted.
I would think if the dealer was re-flashing your PCM, they would throw in the speedo setting for free, it would only be a few extra seconds to punch in some extra numbers with the tool they already have hooked up and are using. BUT, there are cases of Dealer trying to charge people for the PCM updates Chrysler tells the Dealers to give the customer for free, so I suspect most dealer will be charging that $90, even though its only an extra 1 minute of work.