Fullsize Chevy Blazer & GMC Jimmy

"Small Hump" indicates any 2-Wheel Truck equipped with automatic transmission (except TH400 trans) or any 3-speed manual trans with shifter on column.

"Large Hump" indicates any 2-Wheel Truck equipped with a TH400 automatic transmission , any 4-speed manual transmission or any 4-Wheel Drive equipped Truck.

"Small Hump" indicates any 2-Wheel Truck equipped with automatic transmission (except TH400 trans) or any 3-speed manual trans with shifter on column.

"Large Hump" indicates any 2-Wheel Truck equipped with a TH400 automatic transmission , any 4-speed manual transmission or any 4-Wheel Drive equipped Truck.

"Small Hump" indicates any 2-Wheel Truck equipped with automatic transmission (except TH400 trans) or any 3-speed manual trans with shifter on column.

"Large Hump" indicates any 2-Wheel Truck equipped with a TH400 automatic transmission , any 4-speed manual transmission or any 4-Wheel Drive equipped Truck.

"Small Hump" indicates any 2-Wheel Truck equipped with automatic transmission (except TH400 trans) or any 3-speed manual trans with shifter on column.

"Large Hump" indicates any 2-Wheel Truck equipped with a TH400 automatic transmission , any 4-speed manual transmission or any 4-Wheel Drive equipped Truck.