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Old December 31st, 2016, 05:25 PM
Dazzoman Dazzoman is offline
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Join Date: Dec 2016
Location: Sunnyvale California
Truck: 1966 GMC 3/4 ton
Age: 63
Posts: 27
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Default Muncie 4spd to NP440 conversion 66 GMG 3/4 ton

FYI : this conversion was the best thing I ever did for my 66 GMC 3/4 ton w/ 292 6 cly !
I had to make 2 straps ,1 spacer for the left side bolts , have the driveshaft modified , turn the release bearing housing - but my gas mileage increased as well as shifting 1 thru 4 is amazing !
Even the (now lengthened summit) speedo cable gear gear ratio is perfect as before the 465 was way off with the 356 rear end ( was hoping that would cure the gas prob years ago) .
Heres a few pics . I also had to modify the floor pan shift hole but this truck is my regular driver now . Im going to sell the 292 and pop in a 350 because this setup LOVES torque .
You have to opt for either the aluminum or the iron that these come in made from early to mid 80s , I went with the iron (not pictured , this was when I had the aluminum with the wrong shifter ) .If you opt aluminum go ahead and put in an shaft steel sleeve so it won't break . It'll be lighter and very tough .
I was able to use my original 66 bell housing - so I could not worry about cross mounts plus save the old 3 ear cast starter bolt pattern , plus its stronger than the alum bell they offered for the MY6 NP440 NP833 , not to mention the clutch boot stuff .
MAKE SURE you get the truck shifter with it, they are rare and don't get the 1982 van shifter , it positions too far back .
Attached Images
File Type: jpg IMG_3021.JPG (155.2 KB, Multiple views, 11 clicks)
File Type: jpg IMG_3060.JPG (126.5 KB, Multiple views, 13 clicks)
File Type: jpg IMG_3071.JPG (102.8 KB, Multiple views, 19 clicks)
File Type: jpg IMG_3006.JPG (131.2 KB, Multiple views, 10 clicks)
File Type: jpg IMG_2999.jpg (120.6 KB, Multiple views, 10 clicks)

Last edited by Dazzoman; December 31st, 2016 at 05:41 PM.
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