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There is an app called the “TREMEC tool box”. There are several very enlightening calculations you can play with, to get an idea of what to expect when changing different parameters.
 

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@JEFFinOC. That’s my set up AOD with 3:55 LSD. It’s a perfect set up has torque out of the hole and sustains good HP too end. 70 mph revs are 2200
Wow, I wish a toploader 4 speed did 2200 rpms at 70. I think 3.55 puts me closer to 3400, and that too high for my liking. I don't need it to 2400, but I know 3400 would be too much for me.
 
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