Normal? Loud clunk going from D to R and back?

davevinc1080 · January 1, 2021

My 2015 now with 138k kms does the same thing. sometimes it is worse than others but seems pretty normal

Jim Kaufman Jr · September 3, 2021

Just bought an '18 Z71 and have noticed this clang when going from D to R. I pushed it over 15k the first weekend, so it wasn't driven much its first three years. I used to shift before a full stop on my old Impalas until I found out how bad that was. Between 3 '70s Impalas a '92 Silverado and the '99 Tahoe I traded in for Z71, the only time I've heard this sound is when I accidentally (it truly was by accident) did a neutral drop in my '78 Impala and burned through all the clutch packs.

This truck is going to cost more than all 15 cars my wife and I've bought in our lives, COMBINED, and I'm terrified I bought a certified pre-owned lemon. Especially since me, my wife and our daughter fell in love with it immediately.

JimCost2014 · September 3, 2021

1 hour ago, Jim Kaufman Jr said:

Just bought an '18 Z71 and have noticed this clang when going from D to R. I pushed it over 15k the first weekend, so it wasn't driven much its first three years. I used to shift before a full stop on my old Impalas until I found out how bad that was. Between 3 '70s Impalas a '92 Silverado and the '99 Tahoe I traded in for Z71, the only time I've heard this sound is when I accidentally (it truly was by accident) did a neutral drop in my '78 Impala and burned through all the clutch packs.

This truck is going to cost more than all 15 cars my wife and I've bought in our lives, COMBINED, and I'm terrified I bought a certified pre-owned lemon. Especially since me, my wife and our daughter fell in love with it immediately.

Welcome to the site.

Think you are fine. I would just experiment, try pushing the brake pedal a little harder when shifting from D to R, making sure you have completely stopped.

These are big machines with lots of moving parts, two drivelines and so on.

You have the CPO warranty, don't be afraid to use it if you feel the need to, and enjoy your new to you truck, Congratulations!!!

Jim Kaufman Jr · September 3, 2021

1 hour ago, JimCost2014 said:

Welcome to the site.

Think you are fine. I would just experiment, try pushing the brake pedal a little harder when shifting from D to R, making sure you have completely stopped.

These are big machines with lots of moving parts, two drivelines and so on.

You have the CPO warranty, don't be afraid to use it if you feel the need to, and enjoy your new to you truck, Congratulations!!!

Thanks.

I hadn't thought about the possibility of the computer using a lowering brake line pressure as a time to prepare to move by slightly engaging the clutches to prevent rolling back.

As a second generation truck driver, I only see a full size vehicle as just another car.. But, honing my driving skills since I was 12 on mechanically based full size Chevys and commercial trucks, I am finding these newer computer controlled vehicles designed for less efficient drivers get easily confused by my quick maneuvering.

JimCost2014 · September 4, 2021

5 hours ago, Jim Kaufman Jr said:

Thanks.

I hadn't thought about the possibility of the computer using a lowering brake line pressure as a time to prepare to move by slightly engaging the clutches to prevent rolling back.

As a second generation truck driver, I only see a full size vehicle as just another car.. But, honing my driving skills since I was 12 on mechanically based full size Chevys and commercial trucks, I am finding these newer computer controlled vehicles designed for less efficient drivers get easily confused by my quick maneuvering.

Yea, just a guess on my part, but I know when the truck is completely stopped, not a lot of noise, but rolling a little, you do hear things.

Just try it, if the noise still persist, start with the obvious suspensions stuff, are your U-bolts on the leaf pack tight, are both shock bolts tight? You get the drill, may or may not be the transmission at all.

Jim Kaufman Jr · September 4, 2021

4 hours ago, JimCost2014 said:

Yea, just a guess on my part, but I know when the truck is completely stopped, not a lot of noise, but rolling a little, you do hear things.

Just try it, if the noise still persist, start with the obvious suspensions stuff, are your U-bolts on the leaf pack tight, are both shock bolts tight? You get the drill, may or may not be the transmission at all.

Being that it was a certified pre-owned with only 14,840 miles on it, I hope there's nothing obvious like that broken. But, then again, it looks like its been washed with a scouring pad. So they might have beat on it.

I plan on going underneath when I get home at the end of the month to put rust converter on the few spots I see have a little rust starting. I'll make sure everything is in good shape while I'm down there. It doesn't sound heavy enough to be suspension or drive shaft, but light like the disks that come together when you put it reverse. So I think your original assessment might be right. I did notice today that as the vehicle stops I almost release the brakes for a smoother stop and to relax the suspension. I'll test that hypothesis as well.