The flash update for the Chrysler Transmission in the Jeep, is for the 545RFE, that came with the V8, the Mercedes W5A580 does NOT have a flash update. I would confirm all this info, I could be wrong.
BUT, the flash update for the V8 trans, would actually lower mileage and let it shift more often, because the previous programming to improve mileage would leave the vehicle torque converter locked up to much and try to keep it in higher gears all the time, best I can tell from posts describing it, they made the trans act more like it should, downshifting sooner, which hurts mileage, but does make the vehicle respond more like people expect.
Transmission speed sensors, usually there are two, input and output, for the trans controller to monitor the trans, and if its in the right gear and if it is slipping how the clutches are engaging, etc. At least in older Chrysler's, if the computers recognized a bad speed sensor, it would throw a code, that would be readable by doing the key dance to spit fault codes out in the EVIC or Odometer. (And I know I sound like a broken record on this guys) But, Chrysler's increasing move toward making everything proprietary in their vehicles over the last decade, you can't rule out those codes are stored in a way they are only readable with the Dealer Proprietary Tool, there are a ton of codes like that now, more than in the past.
Checking for Fault Codes should be your first step in troubleshooting any suspected problem. Most of the time, if there is a problem, the controllers will spot them and set a fault code indicating what they are.
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