Yes it could be. From what it sounds like is your in need of a rebuild for your trans. First and second gear are part of one pack and third and overdrive are on the second one. It’s a common issue with the tv controlled trans.
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You might wanna add high flow oil pump and an oil pan that holds more oil. Windage tray should also help keep the going longer. Are you trying drag race, road race? It will help to figure out parts to suggest.
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I have this cam in my truck. Runs and drives ok. But I also am going swap to carb on my truck.
https://www.jegs.com/i/JEGS/555/200102/10002/-1
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