Skip the auto shop - Our mechanics make house calls

Q: Trying to put a Duramax engine in

asked by on

I don't want to buy a brand new engine to have it not fit into the truck
My car has an automatic transmission.

Hey there. This can be done for sure, but it isn’t a direct bolt in process. This is a project for someone with experience and passion for working on cars, or the budget to pay someone as much as a newer Duramax truck. The challenge with a project such as this is there will be many problems and challenges. The person who takes it on must enjoy creative problem solving to complete the project. You will need the motor, Allison transmission and the PCM and wiring harness for a Duaramax. Those are just the main items. Often times, the biggest expense is all the little items that are needed to complete the job. Hoses, clamps, gaskets, fabrication of brackets, engine mounts, etc. And then there are the unforeseen obstacles that are part of every project of this nature.

The cost of this sort of project will quickly add up. Unless you have some strong sentimental value with this rig, you will be able to purchase a newer truck for the same cost. The only exception to this is if you are doing the entire project yourself, which will take many hours of searching for answers, parts and time working on the truck. It is a very big project that should not be taken lightly.

There are two good sources for the purchase of a Duramax engine. A wrecking yard or the manufacturer. As I stated before, it is going to take a lot more than just the motor. To be completely honest, you will have to make the motor fit, nothing is going to fit directly. If you would like to have an expert fully inspect the car in person, a certified professional from YourMechanic can come to your car’s location to diagnose the vehicle and advice you on the best actions to take next.

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: Back brake light/ tail lights not working properly

Hello. The brake lights are controlled by stoplight switch, contacted by the pedal. If they are cutting off after coming to a complete stop then that may be a sign that there is an issue with the switch, circuit, or...

Q: Check Engine Light is on

Your check engine light may come on for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or wires and many other reasons. Unfortunately due to the...

Q: No electrical power

This sounds like quite likely a grounding problem. I would recommend starting by checking the positive battery cables looking for corrosion on the connectors and cables. Next, I would check the fuses for power. Try checking one for the headlights...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...