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Registered
Join Date: Apr 2025
Posts: 1
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996.1 DIY Diff fluid change
I have 99 996 cab , manual with 40k .(rear differential fluid change.) Is there a fill plug or does differential and transmission share fluid? basically I can’t find the fill plug on differential. Any help would be greatly appreciated.
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04-30-2025, 05:22 AM
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Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 15,012
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Make sure you loosen the fill plug FIRST before removing the drain plug .
https://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/38-TRANS-Replacing_Manual_Transmission_Fluid/38-TRANS-Replacing_Manual_Transmission_Fluid.htm?srsltid=Af mBOoocHi3fYJZq6zXk2Xi4tzhdM5JsZsGJMN8c21i8lUAjEv9g vwT3
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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04-30-2025, 06:11 AM
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Registered
Join Date: Mar 2016
Posts: 923
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Car is a 15 911S.
First you have to find the fill plug. Then the proper drain plug. It's a big secret at the dealership. There's two fluids in the box, so I'm told. The gear oil, and the ATF oil. You don't want to mix up by accident. Tragedy will ensue. Next is the refill method. Pat your head, rub your tummy, heat the fluid to a temp, dip your finger. I'd say on the ATF, capture what comes out and refill that exact amount. You may have to do it a couple times since it all doesn't drain when you pull the plug. On the gear lube, just put back what you take out, once. I've had the dealer do the ATF at 40,000 and 80,000 miles. At 120,000 I'll have them do both. |
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05-22-2025, 10:54 PM
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