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-   -   72 GMC K5500 Napco big dog (https://67-72chevytrucks.com/vboard/showthread.php?t=862485)

72 tigger 01-21-2026 11:17 PM
72 GMC K5500 Napco big dog
 
1 Attachment(s)
Pretty unusual and cool beast. Diesel with a Allison

https://m.youtube.com/watch?v=0UWCm7vCG_k

Steeveedee 01-21-2026 11:59 PM
Re: 72 GMC K5500 Napco big dog
 
Man, that is AWESOME!

HO455 01-22-2026 10:23 AM
Re: 72 GMC K5500 Napco big dog
 
Too cool! I love the part about no park function in the transmission and having to chock the wheels because the drive shaft brake won't hold 14,000 lbs. :lol:

Chevyland 01-22-2026 11:09 AM
Re: 72 GMC K5500 Napco big dog
 
Great story
Love how he solved his tire problem

Bob B. 01-23-2026 12:46 AM
Re: 72 GMC K5500 Napco big dog
 
Years ago, it wasn't uncommon to see those Toroflow diesels swapped into pickup trucks. They were based on the gas V-6's and used the same mounts and bell housing bolt pattern. There were rumors GMC was even considering making the small 351 cubic inch Toroflow an option in 2500 and 3500 GMC's.

Shark_13 01-23-2026 01:25 AM
Re: 72 GMC K5500 Napco big dog
 
Wow that thing is amazing!

jerry moss 01-23-2026 02:35 PM
Re: 72 GMC K5500 Napco big dog
 
That thing is beyond cool:metal:

franken 01-23-2026 03:30 PM
Re: 72 GMC K5500 Napco big dog
 
Another vid on the truck and it's twin.
https://youtu.be/a5vw6rDmsHo


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