Quote:
Originally Posted by some_other_dave
For fuel economy, you want the tallest gears that you can run at your target speed with the torque converter locked up.
If you've got lots of highway miles to travel, you want the tallest gearing you can find, subject to where the TC locks up.
-soD
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Very true soD.
When I did my trans swap in the Datsun, I was advised by those that had done this swap (on another forum) to keep the original diff ratio (3.54).
Top gear went from 3400rpm at 110kph to 2300rpm, about 32% taller
The L28E engine handles that ratio OK and it's great on the motorway, but the (non adjustable) TC lock-up is around 10kph above highway PSL (80kph, a third of my commute).
I have a 3.9 diff that will still give me a 25% taller top gear than standard, but will drop TC lock-up down to a usable margin below highway PSL.
I still need to find time, opportunity and assistance to swap it over though.
