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As we all know that changing tire size will make your speedometer inaccurate. Don't worry we have what you need to correct this common issue. We have packaged these gears to work withthe 3:08, 3:42, and 3:73 rear ends. To purchase click on the rear end ratio you have. Grand Prix 2+2 would be a 3.08. Your Turbo Buick would be a 3.42. The 442 or 84 H/O would be a 3.73. Simply click on the gear size you have. Then choose 26" or 28" tires. If you have something then these more common units just send an e-mail to Sales@Gbodyparts.com . We will get you what you need. We also sell the drive & driven gears seperately in the Performance/Transmission section of your vehicle on our site. If you need a speedometer bullet we have that as well.