Skip the auto shop - Our mechanics make house calls

Q: Put a new transfer case on, now tranny won't shift out of first unless I do it manually

asked by on

I replaced my transfer case bc the old one was busted and leaking transmission fluid. I put the new one on. When I put it in drive, the transmission will not shift out of first. However, I can manually shift from first to second. It won't go past second gear. Reverse works fine as well. The speedometer and odometer are not working, and the ABS light and parking brake light stay lit. My transmission was fine before I changed the transfer case. I believe it is electrical. Please help!

My car has 250000 miles.
My car has an automatic transmission.

A: Hi there, thanks for writing in about your ...

Hi there, thanks for writing in about your 2000 GMC Sierra 1500. Your transmission and ABS system need a vehicle speed reference to operate correctly. The transfer case has two speed sensors located at the rear extension housing. Inspect the wiring to the sensors. If it looks good and is undamaged, you could try removing the sensors from original transfer case and installing them in the replacement. The transfer case speed sensors put out an A/C voltage when the driveshaft is rotating. If there is no voltage, something internal is wrong with the transfer case. To have this issue addressed, I recommend having a qualified professional, such as one from YourMechanic diagnose the shifting issue in order to have this corrected.

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: 4x4 light flashing but not engaging into 4 wheel drive

Hello there, many common faults will cause your 2007 Toyota Tundra to have the four wheel drive light flashing. The most common faults are a faulty four wheel drive switch, actuator failure, low transfer case fluid, or a shift cable...

Q: My alternator was just replaced. Now it's whining and locking on me! Why?

Check the transmission output shaft housing and make sure that it is not cracked or damaged. The vehicle speed sensor is located in the output shaft housing and controls the speedometer. If the housing is binding with the output shaft,...

Q: Truck shaking at 50 mph inspite of having the tires balanced

Due to the size and weight of 20 inch wheels, you may need to have the tire and wheel assemblies balanced on the vehicle. When tires are balanced only the tire and wheel assembly is balanced. Doing a high speed...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...