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#1 |
Registered User
Join Date: Dec 2014
Location: Sheridan,wyoming
Posts: 3
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Heavy half question
I got a 1971 custom gmc half ton w a 402 with the 400 tranny . 5lug w rocker springers . Had to replace a stud a regular half ton stud was to small I got a 3/4 ton stud It fit, I was told my truck is a heavy half 3/4ton rating . Gm 12bolt rear main trying to find out if and how i can tell if its a heavy half
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#2 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,815
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Re: Heavy half question
All 71, 72 1/2 ton GM trucks had 1/2" x 20 studs.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#3 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,815
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Re: Heavy half question
Options are listed on the SPID in the glovebox.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#4 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Heavy half question
The "Heavy Half" thing came about in the later '70s. Sounds like it was a parts person who doesn't have accurate information. A big block truck will have a slightly higher GVW stamped on the Vin-plate due to heavier engine. Does your truck have a 12-bolt rear or a Dana?
What size stud did you end up using? 3/4t trucks used 9/16" studs and all were 8-lug full-floating rear with a "2" for the third digit in the VIN. The blending of 1/2 and 3/4t had not come about yet.
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#5 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,429
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Re: Heavy half question
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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