2017 250 6.7 4x4 bang..

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Oct 2, 2023 | 05:04 PM

Faithinscience

Thread Starter

4wd Low

Joined: Oct 2023

Posts: 10

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2017 250 6.7 4x4 bang..

Hey guys
first post, always a lurker. Ive had my 2017 f250 since 2018, I've racked up 160k on it. I've had zero issues with this truck besides a BCM shorting out and some lariat creature comfort issues now and then like a seat heater etc..

Recent, I was backing up through a sand pit, while pushing an empty dump trailer, which is approx 3k lbs. I always have to 4H it through this sand patch, and I've done it many times, as it's on the side of my house, I live in the woods. Anyway, in reverse there was a loud bang, it was very very loud, almost like the hitch bottomed out on something. There's nothing under the truck. This has happened about 3 times, only in 4h, only in reverse, no warning lights, no other issues.

The truck has a 8 inch pro come lift I installed myself years ago, and is on 37 inch tires. I know it could be anything with the miles, but anyone run into this? Is the empty trailer weight causing the issue? Thanks.

Oct 2, 2023 | 05:08 PM

djousma

Logistics Pro

Joined: Mar 2005

Posts: 3,535

Likes: 2,501

From: West Michigan

Transfer case? Loose chain in transfer case? Might consider draining it, looking for metal?

Oct 2, 2023 | 05:49 PM

DSLTRK60

Fleet Mechanic

Joined: Apr 2015

Posts: 1,641

Likes: 507

From: Phelan CA

Was the 4x4 light illuminated on the cluster? I'd guess the is ESOF transfer case, so you're relying on a motor to fully engage the synchro teeth. Usually, the light will not illuminate until the shift is fully seated in position.

Oct 2, 2023 | 06:18 PM

senix

Super Moderator

Joined: Aug 2008

Posts: 37,379

Likes: 1,863

From: Frederick, MD

transfer case is my first though.

Ever serviced it?

Oct 2, 2023 | 06:50 PM

scraprat

Lead Driver

Joined: Jan 2002

Posts: 8,655

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From: Itinerant

When does the bang happen? 🤔

Oct 2, 2023 | 06:58 PM

djousma

Logistics Pro

Joined: Mar 2005

Posts: 3,535

Likes: 2,501

From: West Michigan

When do you actually engage 4x4? Should do that well before needed and drive train is loaded up with torque

Oct 2, 2023 | 09:19 PM

ssls6

More Turbo

Joined: Dec 2003

Posts: 534

Likes: 168

From: Park County, CO

In the old days, a loud popping when in 4H was usually a sign the chain in the transfer case is jumping a tooth. Pushing a loaded trailer in the sand is pretty stressful on the drivetrain. It could be your 8" lift banging around. That's a lot of lift to be pulling trailers in sand.