[Bob A]

I have a 66 mustang 289 with a 3 speed transmission & thinking about swaping it out with a 4 speed top loader. Will there be any benifet for the final drive gear. Does any one know what the the a 3spd vs a 4spd toploader final gears are. Will I see my RPM's drop when driving on the highway???

 

[andrewmp6]

If you want lower rpms on the highway look in to a t5 swap.

 

[Veronica]

Hello. The final gear on both of them is 1:1 . Third gear is the one that's missing on a three speed, not fourth.

 

[shagadoodle]

ya t5 swap will be the one u want to lower rpm

 

[Bob A]

As usual THANKS!!!! I think I'm sticking with the 3spd