Skip the auto shop - Our mechanics make house calls

Q: Rear diff grinding noise

asked by on

My truck will go into reverse but not in to drive. When I give it gas in drive it seems like it wanted to go but something is holding back. I looked underneath the truck and the drive shaft will turn half a rotation when given gas.( 2000 rpm) the. I forced it up to 3000-4000 rpm and the car went forward but made a loud grinding noise coming from the rear diff but it still goes into reverse just fine. Also the truck will roll back in neutral but not forward

My car has 169000 miles.
My car has an automatic transmission.

Try unbolting the drive shaft from the rear axle and place the vehicle in neutral to see if the vehicle will roll in either direction first. If it acts the same as when the driveshaft is connected, then the rear differential should be drained and the cover removed to inspect the internals. It is possible that the ring gear or pinion gear may have broken or sheered a tooth or two. This may be preventing the vehicle from moving one way and not the other. If this doesn’t help, then have the vehicle towed - from the rear - or flat bedded to your nearest repair shop for a diagnosis.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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!

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: I have a 2006 lexus gs 300. What is the repair time for replacing an alternator?

Hi there. Depending on whether the mechanic has the right tools, supplies and experience, replacing an alternator can take as little as two hours or as much as 4 to 5 hours. Generally speaking though, it's a three hour job....

Q: cooling fans not coming on

Hi there. It's possible that you have a relay problem that is causing the cooling fans to not activate correctly. I'd start by checking all electrical connections to the cooling fan motor, while checking for any frayed wires or grounding...

Q: I have no oil pressure reading

Pressure should be verified at the test port on the engine block using a test gauge. If pressure is normal, then there is something wrong with the dash display (sending unit, etc.). If pressure is not normal, possible causes are...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.