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Old 12-02-2016, 09:47 PM   #1
Hewfil1
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1974 K10 1/2 ton Posi

Just as the title says. I have a 1974 K10 1/2ton truck with a 12-bolt open diff. I want a posi in it, and not air lockers. Anyone know a good one to put in, if not a full time. I currently am running 33"x12.5"x15" BFGs and it does no good for me to only have one wheel spinning.
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Old 12-02-2016, 10:02 PM   #2
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Re: 1974 K10 1/2 ton Posi

detroit tru trac
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Old 12-03-2016, 08:07 AM   #3
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Re: 1974 K10 1/2 ton Posi

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detroit tru trac
That would be my pick.
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Old 12-04-2016, 12:03 AM   #4
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Re: 1974 K10 1/2 ton Posi

Thanks guys. I take it it's a fairly simple swap-in?
Also, spline count for 1/2 K10? I'm not 100% sure. If I recall correctly it's a 8.875 30spline, right? Then I'll obviously also have to know my gear ratio.

Last edited by Hewfil1; 12-04-2016 at 12:08 AM.
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Old 12-04-2016, 04:42 PM   #5
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Re: 1974 K10 1/2 ton Posi

Yeah you will need to know which ratio you have which would be in the glove box. I've heard good things about the trutrac and personally I had an auburn clutch type lsd that worked well. Will have to setup the gears after install so if you want to swap ratios you are 1/2 way there.
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Old 12-05-2016, 02:43 AM   #6
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Re: 1974 K10 1/2 ton Posi

Got one in the front of my k10 and it works great no issues.
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K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934

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Old 12-05-2016, 11:17 AM   #7
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Re: 1974 K10 1/2 ton Posi

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Got one in the front of my k10 and it works great no issues.
Even with the lockout hubs?
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Old 12-05-2016, 01:52 PM   #8
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Re: 1974 K10 1/2 ton Posi

Yep no problem it is a Limited slip so it behaves very well on the street. Turns like it did with nothing in the front. I also have a np208 and warn hubs.
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86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11
1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020
67 GMC Stepside Straight six/3 on the tree "The Peach"
2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver

K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934

The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903



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Old 12-05-2016, 10:12 PM   #9
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Re: 1974 K10 1/2 ton Posi

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Yep no problem it is a Limited slip so it behaves very well on the street. Turns like it did with nothing in the front. I also have a np208 and warn hubs.
Got a part #?
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Old 12-06-2016, 01:39 PM   #10
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Re: 1974 K10 1/2 ton Posi

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Originally Posted by Hewfil1 View Post
Got a part #?
Detroit TruTrac-Eaton http://www.eaton.eu/ecm/groups/publi.../ct_128302.pdf
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Old 12-06-2016, 06:57 PM   #11
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Re: 1974 K10 1/2 ton Posi

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Thanks!
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