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#1 |
![]() Join Date: Jan 2021
Location: Beautiful Bavaria
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Stupid question, but what would be the correct tool to remove the differential fill plug? I tried 8 and 10 mm metric allen wrenches but neither really fits.
Is it an imperial size? Or just super uncommon 9mm? Thanks!
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ZR-1 #638/1991 |
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#2 |
![]() Join Date: May 2010
Location: Japan
Posts: 3,556
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I could not remember what I bought, but I have a long hex just for this purpose. It might be a 9mm as Chris states in this video. Someone mentioned a 3/8 hex is it and I am guessing it might be what I have. 9mm does not sound familiar and why the heck would GM use metric, but we have a mishmash bag of metric and SAE all over the car.
https://youtu.be/HOp67Cr2BNs Sent from my iPhone using ZR-1 Net Registry
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() Last edited by HAWAIIZR-1; 05-17-2022 at 02:51 AM. |
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#3 |
![]() Join Date: Apr 2007
Location: Northern VA
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#4 |
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Just in case when you are under the Differential, you can add another "Removable Plug"
![]() Just to make sure you have clean Differential Oil ![]() Post 147 - ZR1 Added Systems including Differential Case Drain
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#5 |
Join Date: Mar 2020
Location: calgary
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It's a 9mm - uncommon size but available (Lisle #33960).
3/8 works out to 9.5mm - doubtful to fit. |
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#6 |
![]() Join Date: Apr 2007
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The rear differential is produced not by GM but by Dana Spicer. I've rebuilt a number of these and every component in it, including the bolts and fill plug, are based on imperial dimensions. Here is a photo of a 3/8" hex socket fitted in the fill plug. IMG_2896.JPG
Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#7 | |
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#8 |
![]() Join Date: Jan 2021
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Thanks for the answers. Tough cookie to get that size over here. Wish I'd known already ahead of the gathering
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ZR-1 #638/1991 |
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