C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ZF black tag

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Old Dec 2, 2008 | 10:43 PM
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Default ZF black tag

So, how hard is it to find a zf black tag 6 speed? My transmission is on the last leg. Too much slop in the stick and the R is grinding like an banshee. I have checked fleabay and all looks to be either well used stuff or new blue tags. I would like to replace with a stock black tag, but I really don't know what kind of mods might need to be done for a blue tag. I have an 89 model. What would you do?
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Old Dec 2, 2008 | 10:46 PM
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Only thing necessary to install a blue tag is the throw out bearing requires updating to the late style/size.
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Old Dec 3, 2008 | 12:02 PM
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You can send it to ZFDoc and he'll rebuild it for you.

It'll work better than new, and he'll even tweak your shifter of choice to make it shift like butter.
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Old Dec 4, 2008 | 07:16 AM
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I'm still looking for that info what exactly does that zfdoc do to a transmission?
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Old Dec 4, 2008 | 07:58 AM
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Originally Posted by Mr X
I'm still looking for that info what exactly does that zfdoc do to a transmission?
Go to zfdoc.com, he details everything he does plus options!
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Old Dec 4, 2008 | 09:33 AM
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woohoo arizona


wonder if he works on 700R4
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Old Dec 4, 2008 | 05:03 PM
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Originally Posted by 1991Z07
You can send it to ZFDoc and he'll rebuild it for you.

It'll work better than new, and he'll even tweak your shifter of choice to make it shift like butter.
You said it yourself, black tags are hard to come by (especially given the time of year).

I say send it to ZFDoc.
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Old Dec 4, 2008 | 05:21 PM
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I have a new ZF6 for sale. still in the GM crate.
$1650.
it's for a 1996, don't know if it's blue and black, or green.
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Old Dec 4, 2008 | 05:26 PM
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Originally Posted by larryfs
I have a new ZF6 for sale. still in the GM crate.
$1650.
it's for a 1996, don't know if it's blue and black, or green.
96 is a Blue Tag.

Y-ME had a used Black Tag for sale, look him up if you want a used one.

Noland
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Old Dec 4, 2008 | 06:25 PM
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Where is the tag. when I ordered it, GM only had 1 part # for all the years. they were almost out of them at that point.
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Old Dec 5, 2008 | 12:19 AM
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Go ahead and contact ZFdoc even he'll tell you to buy a new blue tag. By the time you pay for parts to repair your black tag and labor you well exceed the cost of a new blue tag (actually the best thing you can do is purchase a new blue tag ship it to ZFdoc and have him trick it out and you're still probably cheaper than repairing the black tag). If you're worried about the extra torque holding capacity of the black over the blue, don't all you need to do is look at what some '96 LT4 cars a running to know the blue tag will hold up just fine.
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Old Dec 5, 2008 | 12:22 AM
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Bill is super nice, he will chat with you.
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Old Dec 5, 2008 | 12:41 AM
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you can run a blue tag ZF......it's a very stout manual...people get too caught up in the blue/black tag.....I've run both in my car with no issues w/either other than noise with the aluminum FW....
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Old Dec 5, 2008 | 11:29 AM
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black tags aren't invincible, ~600hp and powershifting destroyed mine. i know, i abused it and got what was coming to me. just saying...
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Old Dec 5, 2008 | 03:07 PM
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AND to "complicate" the conversation NOT ALL BLACK TAGS are created equal!! 610 Nm(450) 540 Nm(400)

All ZF's with a "black tag" have a "lift ring" for reverse!

Only '89 - '91 builds are 610 Nm with "some" '92/'93 being 610Nm and the balance of the builds are 540Nm


L98/LT1 builds 032/036/044 are 610Nm

LT5 buillds 031/035/045 are 610Nm

'93 LT1 build 046 is a 540 Nm

'94 LT1 build 084 is a 540Nm

'93 LT5 build 047 is a 540Nm

'94 LT5 build 081 is a 540Nm

-------------------------------

'95 - '96 all builds are blue with "Crash Thru"
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