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Re: 84 GMC straight 6 repower
Welcome to the site, and nice looking project! You definitely have some good parts there! My 76 has a D70 rear and I'm just going to run it until it blows. I typically like to run a D80 for the larger brakes, and strength. But, I don't have anymore, and I need other things more importantly. I built a couple customer trucks that have 650hp+ engines in them and the D70's have been taking their abusing just fine. Also, I built a 88 V2500 suburban and used the Dodge 70 from the donor. The owner hauls a heavy dump trailer loaded pretty heavy, it has 35's and 3:54's, and as far as I know, it's still going strong. So I figure I can make this D70 last a while too. 
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Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project
Tired of spark plugs? Check this out.
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