The trans will bolt up but that year car transmission is about 5" longer than your 66 truck trans. The exception would be OD transmissions which are the same length. You could use the tail housing and mainshaft from your truck with the 57 trans. They have the same internal components.
Fred

Last edited by rfs56trk; 10/09/2009 5:08 PM.
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine