Will 99 Chevy Suburban transmission fit a 96 blazer?

No, a 1999 Chevy Suburban transmission will likely not fit a 1996 Chevy Blazer. While both are GM vehicles, there were significant changes in transmissions and drivetrain configurations between those years and models. The Suburban is a much larger and heavier vehicle, typically requiring a more robust transmission. Even if the bolt patterns *seem* to match, internal components and bellhousing configurations will almost certainly be incompatible. Trying to force a fit could cause serious damage to the transmission, transfer case, or engine.