Skip the auto shop - Our mechanics make house calls

Q: Gears slipping on bus

asked by on

The gears are not grabbing. When I put the bus in reverse on a hill, each gear, high or low, does not send power to the rear differential, causing the bus to roll slowly backwards into traffic.

Hello, there are two reasons the vehicle doesn’t move. The first thing a mechanic will need to check is your clutch. They will look under the vehicle from outside and see if the drive shaft is spinning when you are giving it throttle. If the driveshaft spins and changes with engine RPM, then it’s probably faulty. The second thing to check is the two speed rear-end. In the two speed operation, the solenoid may not be working, or it may have a broken spring inside the gear change unit. Have this problem inspected by a certified mechanic, such as one from YourMechanic, to diagnose your issue.

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: How to set the idle

Hello there, thank you for asking about your 1986 Ford V8-5.0L. The throttle body and idle air control valve should be cleaned first. The idle is not adjustable on this vehicle but the throttle stop on the throttle body can...

Q: Misfire on cylinder 8

It could be the spark plug, ignition coil, or coil boot causing the misfire. You may also have dirty fuel injectors that need to be cleaned. Have the ECM scanned to see if the misfire code is P0308. This code...

Q: Bad gas mileage and always runs in 4WD - 1979 Chevrolet K20 350 V8

Hi there, thanks for your question. Yes, these older Chevys do have full time four-wheel drive. There are kits available that will disengage the differential from the transfer case, but I've heard mixed reviews on how well they work. You...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...