Re: 643 allison trans
Just some info...The at545 IS a 4 speed.
545and 643 are 2 differant animals.
the 545 uses a #3 flywheel housing, the 643 uses a #2, If you have an adapter ring between the flywheel housing and trans you already have a #2.
Depending on how big your bus is the 545 will do you just fine.
I have a MT643 that came from behind a cat 3208 that I,m selling. if interested , email me direct...email@example.com.
I,m in Port Angeles , wa