Differential drain plug
Thread Starter
Tech Contributor
Joined: Aug 1999
Posts: 15,173
Likes: 3,982
From: Connecticut, USA
Differential drain plug
I have my differential apart and was wondering if anyone drilled and tapped a plug for it? I did this on my Muncie 20 years ago and tapped it for a 1/8" pipe plug. I have an old article from the 70's on retrofitting a 12 bolt into a vette housing and they said to tap 1" from the spring pad. I not sure that it's necessary for a street car or not. Any comments?
Gary
Gary
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Differential drain plug (gtr1999)
When I swaped in my new gears I added a drain plug to my diff housing. I drilled a 3/8 diameter hole in the housing 4" behind the pinion seal. Tapped it and fitted it with brass plug. I used teflon tape to seal the threads. It made for a quick drain when I needed to change the gear oil after R/P break in.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: Differential drain plug (gtr1999)
I drilled and tapped my cover plate with 1/4 npt just in front of the spring mounting pad. The spring does block this location but I usually pull my spring every winter so for me it is no big deal.
Melting Slicks
Joined: Apr 2001
Posts: 3,399
Likes: 278
From: Olmsted Falls, Ohio
Re: Differential drain plug (gtr1999)
I think this is a good idea and the factory should have done it. Especially since the cover is not easily loosened to drain the oil on our cars.
Instructor
Joined: Jul 2001
Posts: 189
Likes: 0
From: Berkeley Heights New Jersey
Re: Differential drain plug (KenSny)
I recently used the turkey baster method. Took about 1 1/4 hrs just to get the black gook out and a torn miniscus. Been in pain ever since and am considering surgery.
Team Owner
Joined: Aug 2000
Posts: 21,457
Likes: 463
From: Massillon,Ohio USA
2020 C3 of the Year Finalist - Unmodified
Cruise-In VI Veteran
St. Jude Donor '08-'09-'10-'11-'12
Re: Differential drain plug (bl75vette)
bl75vette, for about $9, you can get one of those lube pumps for boat lower units and put a 3/8" flexible rubber hoses on it with the end slash cut and you'll get 95% for the rear end fluid out in about 4 minutes. Best little pump I've ever owned-use it for both the boat and the Corvettes!!! :yesnod:
