So I have 4.10s (installed by po) in my 87 mgm. I used an online calculator and found that I needed a 21 tooth gear. I bought one and installed it today. Well the speedometer is still off the same amount. I pulled out a purple gear to install a blue one so I thought they were different but I just went to count the teeth on the gear I removed and it also has 21 teeth. So now Im a little lost, which speedo gear do I need? Id like to swap to 3.55s one day so if I could get a correct gear for those Id be happy.
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