The Senior Pontiac’s came with a wider frame to match their wide track and new bodies in 1961. They were well known for legroom front and back with the larger box frame. Wheelbase became 119 and 123 inches, the basic engine remained the big 389-cubic-inch displacement V-8 putting out 215 horsepower.
New for 61 the T Bird retained the four passenger two door in both the hard top and convertible models, built around the 430 Cubic inch V-8 the put out 350 horsepower and the ford-o-matic dual range automatic transmission. This was the appearance of the iconic torpedo like body, the windshield no longer wraps into the door opening, and the steering column swings to the right to allow easy access for the driver.
In 1961 Plymouth dropped the fin they had been the known for, keeping the shell of its unit-construction body, changing to sheet metal gave Plymouth a lower wider look. The Passenger compartment, engine and chassis were barley changed. A flatter rear deck lid permitted an enlarged trunk compartment. The standard V-8 engine had a displacement of 318 cubic inches, and at 230 Horse power, The six cylinder was rated at 145 Horsepower.