The 1961 Rambler "Custom 400" series was a mid-year introduction and started production in mid-April. Introduced 3 new interior colors in all vinyl: Barcliff Red, Aqua Mist, and Whirlwind Tan. Availbe in 5 models: Rambler American Convertilbe, Rambler American 4-Door Sedan, Classic 6 4-Door Sedan, Rambler Classic V-8 4-Door Sedan, & the Ambassador V-8 by Rambler 4-Door Sedan

On the interior, the dashes were padded, aluminum door scuff panel with Chrome-plated side covers. AMC's first (wide) bucket seats with chrome trim on the sides. A few items were Model specific:
Padded Visors (Classic & Ambassador)
Chrome-platted window sill trim (Classic only)
Aluminum Insert between trim (Classic & Ambassador)
Silver Metallic Door Panel Insert (American & Classic)

1961 Rambler Custom 400 series was intorduced to Dealers via a letter dated April 11, 1961 (received around April 14, 1961). The first few off the line did not have the "400" script as it wasnt available. The first batch of literature was sent out to Dealers at no charge, and expected to arrive at their door by May 15, 1961.