F;
It depends on the condition of the transmission. I get $150.00 for mine (used), then they need to be "gone through" so that's more money & time.
$450 is okay if It's a rebuilt one with a guarentee from a Transmission Shop, or your getting all the electrical, cable and other goodies with it etc.
I would follow Bryan's advice. "Put is all together & see how you like it first."
There's always time to go shopping.
You might find a 'deal' on a T-5 somewhere.
PS: Patrick's "spin on" is mounted like Frank's.