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post #1 of (permalink) Old 10-11-2000, 03:14 PM
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Locker or Limited Slip?

Hey guys,

I am looking at a 1980 Chevy K20 4x4 truck for sale. On the sticker in the glove box it says that is has a locker. Is this an actual locker or just a limited slip? It is all factory equipment but I was curious if GM offered an actual locker or not. Thanks for the help


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post #2 of (permalink) Old 10-11-2000, 04:23 PM
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Re: Locker or Limited Slip?

It should be a limited slip. I am not aware of a factory locker available in GM trucks except for really old ones. They call the Gov-loc a locker, but it's an L/S.

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post #3 of (permalink) Old 10-11-2000, 05:10 PM
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Re: Locker or Limited Slip?

i know that my friends 92 blazer has a gov. locker in it[from the factory] and it is a true locker it doesn't have the best reputation.they work with a counter weight that spins out when it spins one tire faster than the other they are rather jerky on the trail.but gm used them in the 80s. just a little info later mike.

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post #4 of (permalink) Old 10-11-2000, 05:23 PM
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Re: Locker or Limited Slip?

If the option tag is G80, thats the "posi". It should be the Eaton Locking Unit which I have. Its not a true locker, as shaggy said, but its not really a limited slip - it doesn't use preloaded clutches, it uses the counter wieght as described by Mike. I like the unit. Its worked well for me and I haul some pretty heavy loads over some rough trails. I can put the pedal down and leave two nice equal length patches - not that I do that very often with my new tires though...

post #5 of (permalink) Old 10-15-2000, 02:17 AM
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Re: Locker or Limited Slip?

The following quote was taken from Randy of Randy's Ring and Pinion Talk/Myths.html

Myths regarding diffs

"Positraction is better than limited slip. I have heard many people call
a standard open differential a "limited slip" and I have been asked for
a limited slip instead of a positraction because they wanted something
that was not too aggressive. From my experience positraction and limited
slip are just two different names for the same thing. If anyone can find a
SAE standard or printed definition please let me know and I will gladly
correct myself."

So according to Randy the Eaton is a LSD or POSI because he classifies them as the same thing. Doesn't really answer the question about being a locker though.

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post #6 of (permalink) Old 10-15-2000, 11:18 PM
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Re: Locker or Limited Slip?

GM has not put a locker in any of it's trucks in a LONG TIME from the factory. Neither have any other truck manufacturors other than Toyota, with their electronic locker thingy. Of course, any salesman at any of those dealerships will tell you they have a locker, but do you really think Mr Spiffy Suit even knows the difference between a locker or a limited slip/posi? The G80 option code in the glove box is in fact, the Eaton Gov-Lok Posi limited slip. My 92 Blazer has that very option, and believe me, I spent some time with it cross axled today, it IS NOT A LOCKER! [img]/wwwthreads_images/icons/tongue.gif[/img]
On a side note, I heard the other day that GM actually used to put lockers in it's heavy trucks back in the day, like the 60's and earlier. Anyone know of this?
Hope this helps.

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