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72Stroker Dec 6th, 04, 11:38 PM The Speedo is way off...at 55MPH my wife in my hopefully reliable, 2005 F350 on the highway clocked the 55mph Malibu at 70 in the truck... The previous owner said that the speedo gear in the tranny was out of a TH350? How can I calculate which color speedo gear to replace? Thanks, Brian DaleM Dec 6th, 04, 11:51 PM Try here (http://chevelleengineer.home.comcast.net/speedo.htm). GM part numbers, colors, everything graemlins/thumbsup.gif Surfcat64 Dec 7th, 04, 9:30 AM As I remember, each tooth added or subtracted from the driven gear would change the speedo by about 8 MPH. Sounds like you need a gear with two more teeth and you'll be pretty close. pauls Dec 7th, 04, 11:20 AM Mine's way off too and its part of my strategy: Officer: "Do you know how fast you were going?" Me: "Actually, Officer, I have no idea. You see, I changed the tire size, the rear gear, and the tranny and I couldn't find the right speedo gear and ... 7t Dec 7th, 04, 11:58 AM i was surpised i went by one of the signs that read out your speed my 70 was right on,or maybe the sign was incorrect don't know how accurate they are. BlueSS454 Dec 9th, 04, 9:49 PM http://www.chevelles.com/shop/speedo.html RussD Dec 10th, 04, 1:26 AM Originally posted by pauls: Mine's way off too and its part of my strategy: Officer: "Do you know how fast you were going?" Me: "Actually, Officer, I have no idea. You see, I changed the tire size, the rear gear, and the tranny and I couldn't find the right speedo gear and ... I tried that one and got... "So you're telling me this car isn't safe for California highways and I should call a tow truck and impound it right now?" I took my speeding ticket... AND ended up with a fix it for my speedo :( | ||