The first generation. 1960-1966.
In my opinion a good old classic. Fun to drive, good looking,etc.
The second generation. 1967-1972.
I think it was a good use of double headlights. If you notice other GMCs from that time period they have the same headlight configuration.
The third generation. 1973-1987.
I think it is a pretty cool, good heavy light duty truck.
The fourth generation 1988 to 1
No.1
It personally is my favorite of the generation.
No.2
It is also a good truck but I think No.1 better looking
No.3
My least favorite of the time period.
The fifth generation. 1998-2007.
I think it is a fine truck but on the limited denali version they over did it.
I think that the new one is just like any old new one