Q: Do I have to change the engine mounts and bellhousing when switching to the 3.9l?

asked by on

I want to switch my 3.5 l g6 to the 3.9 and was just curious what all I would have to convert to do it?

My car has 120000 miles.
My car has an automatic transmission.

The engine should bolt up to the transmission, but the 4t45e has a lower torque rating than a 4t65e so pushing more power through it might cause problems. There may also be a few subtle issues with mounting the new engine into the car. It would be best to drop the subframe with a good engine, trans and electronics from the donor vehicle and swap it all into the car. You’ll have to do a lot of research on this one to get it working right.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Do I have to change the engine mounts and bellhousing when switching to the 3.9l?

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 would like to know which engines are interchangeable in my 2003 Dodge Ram 1500

Hi there. You can use any engine from 2003-2008 Dodge that was equipped with the same engine. In 2006 they used two different 5.7 engines so it would be important to check the engine code to make sure that it...

Q: how much does it cost to do a 2008 chevy impala engine swap

Prior to replacing the whole engine, you should obtain a diagnosis of both the loss of power issue and the noise. There are some noises that originate from accessories and there are also noises from the valve train and repair...

Q: Door handle broken

Hello. This is most likely a mechanical issue with one of the components of your door latch assembly. An inspection would need to be completed to determine why your door won't close all the way. I would suggest you have...

Related articles

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...
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...
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...