RSD501 Posted February 4, 2016 Share Posted February 4, 2016 I have a RW613 with 4.42 rears and a t2090 trans. Truck came with 24.5 rubber and we switched over to 11r22.5 . The speedo drive is worn out and not working, and I want to get the right ratio so the speedometer runs true. The "adapter" as the parts breakdown calls it, has a ratio of 1.132 from the factory. Can anybody help me with the correct ratio? Or if anybody has a serial number for a truck with the same specs but factory 11r22.5 tires that would work too. Thanks for any help Quote Link to comment https://www.bigmacktrucks.com/topic/43887-speedo-drive-ratio/ Share on other sites More sharing options...
Back In Black Pulling Posted February 5, 2016 Share Posted February 5, 2016 Dealer should be able to figure that out if you give them tire brand and style Quote Link to comment https://www.bigmacktrucks.com/topic/43887-speedo-drive-ratio/#findComment-323050 Share on other sites More sharing options...
RSD501 Posted February 5, 2016 Author Share Posted February 5, 2016 The dealer was helpful to a point, but they can't find the old bulletin that had a chart to help determine the required ratio. They suggested a similar truck but speced with 11r22.5, and using that vin. I was at the parts counter for awhile, and there was some mumbleing about the age of the truck.... Quote Link to comment https://www.bigmacktrucks.com/topic/43887-speedo-drive-ratio/#findComment-323059 Share on other sites More sharing options...
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