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The Z71

The Z71

Postby In2Trux [OP] » Feb 19 2011, 3:42am

Does anybody know the story behind the Z71
What does the "Z" stand for?
And the "71" What does it stand for?
How old is the Z71 ?
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Re: The Z71

Postby 2003Z71 » Feb 19 2011, 3:55am

Z71 is an RPO (Regular Production Option) code for GM off road package. As far as I can remember, it was first offered on the 1987 GM trucks. Among other things it consisted of off-road tires, an automatically locking rear differential, skid plates, and Z71 badges. I'm sure someone else can add more.
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Re: The Z71

Postby Oh that guy » Feb 20 2011, 11:45pm

To add, the Z has been used as a perfomance designating prefix as far back as the Z16 '65 chevelle maybe longer. What I don't understand is why the Z71 option is the only "Z" option I know of to cross more than one body type. Pickup's, Tahoe's , and Burban's get Z71, while the avalanche got Z66. It's the same platform. Can anyone elaborate?
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Re: The Z71

Postby lohchief » Feb 21 2011, 12:12am

Automatic lockers didn't come on board with the Z71 until 2007.It used to come with a limited slip,or as GM calls it,Positraction.
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Re: The Z71

Postby Z15 » Feb 21 2011, 1:20am

Posi-traction refers to the GM Limited Slip Differential which is a name from the muscle car era. Limited Slip differentials are normally installed in rear wheel drive cars (my CTS has a limited slip). Trucks have been using a locking rear differential for a long time.

According to an old GM parts RPO code book I have, 1983 was the first year Z71 was used. It included different items on different models and in different years. While its true many notable performance options (Z15, Z28, ZR1, Z25) are listed in the Z group not all Z-- rpo's are performance.

from code book dated 2000ish
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Re: The Z71

Postby taphillips2 » Apr 10 2011, 9:50am

Seems like it just worked out as that code then Chevy/GMC decided to charge a little more and make "Z71" a household name for "sooped up" 4wheel drive chevy trucks.
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Re: The Z71

Postby EKinMN » Apr 10 2011, 2:35pm

I have also read that the Z71 package is the most asked for in GM history, and it also adds to the resale value of the truck.
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Re: The Z71

Postby rdss » Apr 10 2011, 3:14pm

I have read on this forum that keeping the flex fuel emblem adds resale as well. If they would not have BRAC'd NAS Brunswick, I would have probably gotten the Z71 was well. Jacksonville, FL doesn't see much need for 4X4 unless you need it or just like to run a huge lift and tires on your street truck.
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Re: The Z71

Postby GMCRoss » Apr 21 2011, 4:57pm

the Z71 in the newest style is just the addition of skid plates and larger monotube shocks and the sticker. When I ordered my sierra I had the skid plates put in and the larger monotube shocks, but it was not a Z71 off the lot, my truck still has the 4X4 logo...so no real difference. if you do not have a Z71, next time you need new shocks get larger 46mm monotube bilsteins and throw on some aftermarket skid plates and get a sticker off ebay and you have a Z71
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Re: The Z71

Postby tmurph01 » Apr 22 2011, 12:51am

I know that, as far as Camaros are concerned, the "Z28" was the next available option code when that particular model came out. It has stuck and been that way ever since. I am pretty sure that "Z71" has no real meaning behind it and it too was just the next available option code.
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