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Discussion in 'The Garage' started by uberbeans, Jun 21, 2006.
To calibrate a speedo for 37's w/ 465/205 is this done by changing the box or what?
If its a Stewart-Warner reduction box,they used to sell different gears to change the ratio of the box to match the new tires,rear end gear ratio,etc...not sure if they still do or not..one parts store I worked at had an assortment of them in a wooden case --it was in the "heavy truck" section that sold parts for tractor trailers...--try a semi truck parts store or a spedometer shop ,they might have some still...GM dealer might too...
Do you think they would have one for tires as big as 37's?
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