Couple questions

New to the Dodge Dart. Need help with a couple things please. 1974 Dodge Dart slant 6 automatic. Question 1. Which transmission do I have? Has a leak gotta change the pan gasket.
Question 2. Speedometer buzzing and jumping around. Anybody got a good fix on that? Just some dry lube or is it usually the cable or is the speedo shot? Works great most of the time but sometimes it gets angry.

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