First, check your speedometer to see how far it's off. Speedo check web page

Then remove the plastic speedo gear and take it to a tranny parts shop and tell them how much your speedo is off. They will sell you a new gear with the proper number of teeth to match. At the same time, replace the oil seals in the speedo gear housing. The gear should be under $10.


Fred
52 3600
69 C-10