Can the transfer case be damaged when a new transmission is installed?

WBROWNING1961

MEMBER
2016 INFINITI QX80
V6
4WD
AUTOMATIC
157,600 MILES

It went out 2 days after the transmission went in. I don’t know if fluid needs to be drained before replacing the transmission, etc.

Monday, October 24th, 2022 AT 5:51 PM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

The fluid does not need to be drained but if it was, did it not get refilled? Also, when you say it went out what seems to be the problem? Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response. Here are some diagrams in the images below to show you how to check the fluid and the component locations as well.

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Tuesday, October 25th, 2022 AT 10:42 AM

WBROWNING1961

MEMBER
2 POSTS

2 days after the transmission was installed, when decelerating from a rapid speed (like on a freeway exit ramp), the engine would race and the dash display would show an image with it flipping through High 4 WD, then Auto, the Low 4 WD. When you stopped or turned the engine off, it would be normal. It never occurred when the gas pedal was pushed and the engine engaged. I just found it suspect that this never occurred until the transmission was replaced. I know that it goes out with mileage, but seemed like a big coincidence? So I wondered if the transfer case could have been damaged when the new transmission was installed.

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Thursday, October 27th, 2022 AT 6:34 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yes, that is possible. Are there any codes in the car? This guide will help you gather them:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

The code read is easy to do, let me know what you find.

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Friday, October 28th, 2022 AT 9:28 AM