Skip the auto shop - Our mechanics make house calls

Q: Loud knock and not truck will not drive when gas pedal is pressed down

asked by on

We were driving approx. 70 mph and heard a loud noise from under the truck. It sounded like we ran over a huge rock the hit the bottom. Pulled off right away and parked. Truck will turn on and shift into gear but will not move forward when I step on gas pedal. What might be wrong and will it roll if in neutral for tow?
My car has a manual transmission.

A: This sounds like you broke a driveshaft or ...

This sounds like you broke a driveshaft or the clutch broke causing the transmission to not engage. You should look at the driveshaft to see if it is intact on the transmission and rear end. If you have 4 wheel drive you may have broke something in the transfer case. Have a mechanic like one from YourMechanic come and check truck to determine what broke.

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: When i turn the ignition on and accelerate, the traction light comes on and almost immediately the Engine managmemnt light comes o

Hello. It's quite possible that a speed sensor or other transmission sensor might be causing this fault; as these two components typically trigger those warning lights to illuminate. However, it's also probable that an internal transmission issue is the source...

Q: Oil light flashes when I push brakes

Hello. You don't indicate the mileage on your vehicle, but a high mileage or poorly maintained or abused engine could have low oil pressure from worn connecting rod or crankshaft main bearings or a clogged oil pump pickup screen. It...

Q: Clutch has no resistance and stays on floor

Greetings! We will be happy to assist you. I believe the clutch problem likely stems from a faulty slave cylinder. Very common problem on manual vehicles. The master cylinder may be the issue but not as likely. The master cylinder...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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...