What motor is in a '91 3500?

[SUPER'BURB]

What diesel motor is in a '91 3500?
Is it a turbo and if not what year did they start putting a turbo in?

Thanks for your help in advance.

 

[azblazor]

91 is most likely a 6.2NA with a 4L80E. You could order a factory Banks turbocharger setup in 91 as an option. Starting in 92 was the factory 6.5 TD with mechanical fuel injection.

 

[SUPER'BURB]

Thanks for the info