Depends on how low of an RPM the car will tolerate.
Cam choice is a big factor.
Can you drive the car smoothly at 2000 rpm in 4th?
What is the lowest it will tolerate?
What speed do you drive the most & how often to you like to shift?
My car has 4.10's & does not like to be under 2000rpm, (it idles at 1300) so I chose the .81 & can now drive it in 5th at most speeds over 45.
It keeps me from shifting constantly, and I did not intend on a long distance highway car though.
Last edited by Lonnie; 10-19-2021 at 08:43 PM.
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