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Home » Public Forums » GMC Swap Meet » Performance built 403 SOLD (Drop-in replacement for 403 or 455)
Re: Mondello Performance 403 [message #307678 is a reply to message #307637] Fri, 23 September 2016 07:55 Go to previous messageGo to previous message
xplorid is currently offline  xplorid   United States
Messages: 213
Registered: February 2012
Location: Boise
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Hi John - I'll start a thread on the board in the next week or two, but the short answer is the 6.5 TD seems like it belongs in the GMC, cruised 75-80 mph on I 80 coming back from SanJose, 12.46 mpg including crossing the Sierras and the mountains in S Idaho. I am real happy with the swap. The 403 with a 3.70 would have put a grin on my face as well.

1974/94 GMCII by Explorer Manny 6.5 TD Al radiator 1 ton front 4 bags back
 
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