The serial numbers are classified by the following:
Length: New Looks
40 foot models: 5301-5310
35 foot models: 4516-4523
Length: Old Looks
40 foot models: 4501-4515
35 foot models: 3501-3510
The first production GMC New Looks were introduced in 1959. The first group (5301-5302) looked like this: front of a 5301:
http://www.nycsubway.org/perl/show?15981
rear of a 5301: Link to "images.google.com"
bus #438
The second group (5303-5304) was introduced in 1963, and was GMC's top selling New Look. They featured some minor changes (marker lights, tailgates, engines)
TDH 5303:
http://www.motorbussociety.org/conventn/02spr/DTS%20494.jpg
rear:
http://gallery.bustalk.net/displayimage.php?album=74&pos=25
The 5305-5306 was introduced in 1967, and featured a more standardized tailgate and look. These were very popular in San Francisco
5305:
http://gallery.bustalk.net/displayimage.php?album=74&pos=37
5305 rear:
http://gallery.bustalk.net/displayimage.php?album=74&pos=53
The 5307-5308 was introduced in 1972, and was very popular with Chicago, with over 2000 built over a period of four years
5307:
http://www.busdrawings.com/Transit/illinois/chicago/1972t8h5307a/1233.jpg
The last group was the 5309-5310, which were introuced in 1973.
5309: Link to "www.busdrawings.com"
GMC closed their American plant in 1986, with the New Looks being produced in Canada under the Brown Boveri Industries.
1981 BBI ETB:
http://www.busdrawings.com/Transit/alberta/edmonton/bbc/index.htm
The last GMC bus from Canada was a group of 26 1986 5307 'A' for Santa Monica Municipal Bus Lines
5307 with a rehabbed tailgate: Link to "www.busdrawings.com"
Thanks to Snookie
