Re: 1956 Packard 400 color of engine transmission and valve covers

Posted by Owen_Dyneto On 2019/8/10 12:48:53

1956 Utica plant motor number prefixes:

A = 5640, Ultramatic
AA = 5640, standard trans

B = 5660/5670, Ultramatic
BB = 5660/5670, standard trans

C= 5688 (Caribbean), Ultramatic only

D = 5680, Ultramatic
DD = 5680, standard shift


The numerical sequence # began at 1001. So for example, motor C-1501 would be the 501st Caribbean motor, with Twin Ultramatic.