I have a custom built wide ratio toploader in my 65 Mustang road racer with a hurst shifter assy. and it shifts perfectly, like a bolt action rifle.........been in the car 4 years now.....change the
oil once a year.....no problems....
I also have a Tremec 3550 (circa mid 90's) in my 65 Mustang fastback street car and it shifts perfectly, like a bolt action rifle.....been in the car since the mid 90's,change the
oil every 3 or 4 years, no problems........
The main difference I see is the "throw". The Tremec is way shorter distance between gears.......
I like them both,for Vintage racing we are NOT allowed to use anything but a factory 4 speed trans, hence the toploader....
For a street car, I love the Tremec and 5th gear overdrive as I drive my street car a lot and 5th gear gets used a lot.....
BTW: on the Tremec, the first 3 gears are a lot lower (numerically higher) than the toploader and great for "coming off the line"......
Just depends on how you plan to use the car.
David