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

1990 six speed fill plug

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Old Sep 16, 2010 | 03:58 PM
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Default 1990 six speed fill plug

does anyone know the size of the hex fill plug. it lookd to be around 3/4 of an inch or is it metric. thanks for any help
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Old Sep 16, 2010 | 04:36 PM
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Can't tell you the size offhand, but the trans came from Germany- it's metric.
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Old Sep 16, 2010 | 04:47 PM
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Pretty sure it is 17 MM.
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Old Sep 16, 2010 | 05:42 PM
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its def takes a 17mm allen. My bottom drain plug got destroyed by a few speed bumps and I've tried finding replacements and its really starting to get hard.
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Old Sep 16, 2010 | 06:11 PM
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expect to pay upwards of fifteen each. If you can find them buy two. I found a chevy dealer on e-bay with some last year.ZF-doc my have some also. Tim
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Old Sep 16, 2010 | 06:12 PM
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Originally Posted by toptechx6
Pretty sure it is 17 MM.
Originally Posted by rithsleeper
its def takes a 17mm allen.


You'll want to get a 17mm hex bit socket similar to this:
http://www.sears.com/shc/s/p_10153_12605_00942670000P
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Old Sep 16, 2010 | 09:39 PM
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Originally Posted by rollamo-lt4


You'll want to get a 17mm hex bit socket similar to this:
http://www.sears.com/shc/s/p_10153_12605_00942670000p
thanks for all your help.
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Old Sep 16, 2010 | 11:43 PM
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I made a fill or drain plug tool.

Short bolt with a 17mm head & a thread matched nut.

Assemble & weld the nut to the bolt.
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Old Sep 17, 2010 | 08:18 AM
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Originally Posted by rithsleeper
its def takes a 17mm allen. My bottom drain plug got destroyed by a few speed bumps and I've tried finding replacements and its really starting to get hard.
If you're desperate, for an interim solution, braze a bolt head on the plug and use the appropriate wrench on it.
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Old Sep 17, 2010 | 08:22 AM
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I'm also interested in the threaded end size. Looks like someone used a pipe wrench at one time to take mine out.
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Old Sep 17, 2010 | 06:39 PM
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Originally Posted by Churchkey
I made a fill or drain plug tool.

Short bolt with a 17mm head & a thread matched nut.

Assemble & weld the nut to the bolt.
I made one too. I took a 17mm allen socket and attached it to a 3/8 ratchet. I had to push the button on top so it would slide on. I thought it was a good idea since I can easily switch between tighten and loosen.

Na, I'm just messin with you. Thats actually a really good idea, I'm going to make one because I like to keep one with my dunebuggy because their fill plug is the same as my vet and I carry it with me on the trail.
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Old Sep 17, 2010 | 07:49 PM
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You can get them on ebay and harbor freight all day.
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Old Sep 17, 2010 | 08:04 PM
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You can buy a long handle 17mm hex wrench at a commercial hardware. Mine cost @ $4.00. If you need more leverage use a cheater on it. It also fit the fork plugs on one of my motorcycles.
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