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Will the transmission from a 1988 4x4 suburban fit into 1978 gmc 4x4?

No, a transmission from a 1988 Chevy Suburban 4x4 will almost certainly not fit into a 1978 GMC 4x4. The drivetrain components changed significantly between those model years. The bolt patterns, output shaft dimensions, bellhousing, and even the overall size and mounting points are likely incompatible. Even if some parts *look* similar, critical dimensions will be different, making it impossible to install correctly and safely.