The Stovebolt Site Forums The Shop Area Driveline Changing Rear Gears 4:11 to 3:55

I did the same as what John is talking about, but was able to work with a local Speedo shop who supplied me with a speedo adapter. Then just a few years ago I changed my tire size and had to do this again but this time having a cel phone GPS ap such as SPEEDBOX or similar made it easier yet, telling me how fast the truck was actually going versus what the truck speedo was indicating. Now and then I periodically check the truck's speed reading using SPEEDBOX as a comparison. Both are talking same language (at least close enough for my likings.)

Just went thru my truck folder and found that I used PATC of Bossier City, LA to supply my latest adapter back in July of 2014. Sorry to say, no longer in business.