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Old 06-11-2015, 07:41 PM
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69427 69427 is offline
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Default Late C3 and C4 differential fill plug size/threads

I'm adapting a C4 D36 batwing to my C3 differential to pull a few more pounds off the car. C3s have the fill port in the cover, while C4s have the fill plug in the differential housing, hence there's no built in way to fill the differential once these parts are bolted together. I need to drill and tap the C4 cover (somewhere), and if I have room I'd like to use the factory plug (otherwise I'll just use a smaller pipe plug in there somewhere). Anybody know what the thread size is for the fill plug in the C3 batwing and the C4 diff housing?

Thanks for any help!
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Old 06-14-2015, 01:51 PM
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Twin_Turbo Twin_Turbo is offline
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If you go custom drill 2 holes. One for a level plug and another for a fitting and remote filler line. Much easier that way. As for the thread...no idea. Maybe metric but thought it was an npt size
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Old 06-14-2015, 06:36 PM
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69427 69427 is offline
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Quote:
Originally Posted by Twin_Turbo View Post
If you go custom drill 2 holes. One for a level plug and another for a fitting and remote filler line. Much easier that way. As for the thread...no idea. Maybe metric but thought it was an npt size
Yeah, that's not a bad idea. Thanks.
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Old 06-15-2015, 06:09 PM
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84rzv500r 84rzv500r is offline
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ok not to hijack but WTH... where do I put the holes in the C3 Iron diff for my rear diff cooler set up... I cant find the specs and I know Ive seen them somewhere... oh never mind i found them in my 2nd edition Power manual 1/2in NPT sucks to get old and CRS Syndrome

Be sure radius the edges of the holes nicely

I found some nice used NASCAR set ups and I will just run an 12V motor instead of the pinion shaft pulley,,,

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Last edited by 84rzv500r; 06-15-2015 at 06:12 PM..
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Old 06-15-2015, 07:47 PM
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Sam Cogley Sam Cogley is offline
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I was thinking 1/2 NPT was the right size, thanks for the confirmation. NPT is tapered, make sure you don't cut too deep with the tap.
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