Q: Differential fill plug can't be removed - 1984 Chevrolet K20

asked by on

I have tried and tried, but can not remove the differential fill plug. I even used a torch to heat it and I also tried pouring various kinds of penetrating fluid on it. Nothing works. Almost all of the fluid in the pinion seal has leaked out, plus the rear end has been squealing when I just lightly touch the throttle. Is there a way to fill this without removing the differential fill plug?

Hi there, thanks for your question. A few different differentials were offered in trucks like yours, so I’m not sure which one you have. In some cases, there are aftermarket differential covers available that include a fill plug. If not, you can try chiseling out the OEM fill plug or you could drill and tap a new plug into the differential cover.

If you’d like further help with this issue, consider having one of our certified automotive technicians come to your home or office to perform this service for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Differential fill plug can't be removed - 1984 Chevrolet K20

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: the car has suffocation feeling when accelerator is pressed and does not speed constantly

This sounds like a low fuel pressure problem, or an air filter and mass airflow (MAF) sensor problem. Check the fuel pressure and replace the fuel filter first to see if it helps. Next, have the system computer scanned...

Q: Rear pinion seal leaking. Would i also need to change the flange?

The flange is integral with a splined yoke. The yoke segment (of the flange/yoke) has a precision, machined, highly polished surface which mates with the rubber seal. Since the rubber seal is spring loaded and is under tension against the...

Q: Car making high pitched squeal.

The first issue is you overheated the engine because the cooling fan motor blew the fuse and the radiator split from getting overheated. You replaced the fuse and not the fan and should replace the fan motor also. You replaced...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...