Need 12 bolt rear advice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**RenoKeene** · 05-12-2013, 11:03 AM

Looking for compatible 73 and up 12 bolts to bolt up to stock 70 GMC leaf springs. I know
They got wider in 71, it's the saddle and shock mount locations that concern me.
Any info would help.
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INSIDIOUS '86 · 05-12-2013, 01:20 PM

You will prob have to go the hard way and grind off the leaf pads and move them to a new location. Same with shocks.
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**RenoKeene** · 05-12-2013, 05:32 PM

Kinda figured that, was hoping to avoid it though.
Posted via Mobile Device

KrazyRay · 05-12-2013, 10:49 PM

The leaf spring pads are in the same location 67-72 2wd and 73 up. The 67-72 4wd are different by about an inch. Also, the 70 6 lug should be the same width as 71-72 5 lug. Are you looking to convert to 5 lug?

05-12-2013, 11:03 AM	#1
RenoKeene Florida Edition Join Date: Oct 2010 Location: Fruitland Park, FL Posts: 4,028	Need 12 bolt rear advice Looking for compatible 73 and up 12 bolts to bolt up to stock 70 GMC leaf springs. I know They got wider in 71, it's the saddle and shock mount locations that concern me. Any info would help. Posted via Mobile Device __________________ 70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394

05-12-2013, 01:20 PM	#2
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: Need 12 bolt rear advice You will prob have to go the hard way and grind off the leaf pads and move them to a new location. Same with shocks. Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

05-12-2013, 05:32 PM	#3
RenoKeene Florida Edition Join Date: Oct 2010 Location: Fruitland Park, FL Posts: 4,028	Re: Need 12 bolt rear advice Kinda figured that, was hoping to avoid it though. Posted via Mobile Device __________________ 70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394

05-12-2013, 10:49 PM	#4
KrazyRay Registered User Join Date: Jun 2009 Location: Oroville, CA Posts: 4,827	Re: Need 12 bolt rear advice The leaf spring pads are in the same location 67-72 2wd and 73 up. The 67-72 4wd are different by about an inch. Also, the 70 6 lug should be the same width as 71-72 5 lug. Are you looking to convert to 5 lug?

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