I bought my 83 300sd with aprox. 124,000 miles on it last year. It wasn't long before I realized that the odometer gear was missing half it's teeth. By 127,000 mile the rest of the teeth were gone. at that point I put in the the gear kit as per a link I found here in th eshop forum.
I'd like to have an idea of how many miles my car may have on it.
Any thoughts on how long it may have taken for the first half of the teeth to break off the odometer gear?

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83 300sd
3 fords