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That's great Aaron! Can you tell us which specific part you got? There looks to be a few with the same model number but by different manufactures. I'll try installing the unit I have on Tuesday, and if that doesn't work, I'll know what my backup plan is. Thanks again.

Ok. I ordered and received "Ratio Adapter, Speed Up Rate: 20%" that is part number 54RA2+20% from PATC Transmissions. Their phone number is 1-888-201-2066. The part cost $62 plus $8 in shipping with no tax. I have not yet got a chance to install it, as my tuck is parked an hour away. I make...

Well, since we have proven success from another SS member with the 54RA2 part from PATC, that seems like the way to go. I'm going to order one of these up and see how it does. Thanks for doing the research on this, peashooter!

Thank you, peashooter I submitted a request for a quote. I've done that before through this same group, and they've came back with ridiculous quotes. I hope this is a part they have in stock.

Thanks Rmtaunton! Let us know what you find.

Who on the ePay did you get it from? It looks like this adapter from the 900 series of trucks is for the 43" tires, is that correct? If so, that would get the speedometer reading closer but not totally corrected. Does that sound right?

Does anyone know if there is an adapter to correct the speedometer reading when you move up to the 395/85R20 tires? My truck speedometer reads about 7 to 8 MPH slower as compared to what the GPS say. I have looked though other thread posts, but have not yet found the right one. I know it's...