Jump to content

Drop shackle vibration?

Snakes709
 Share

Recommended Posts

Snakes709 Enthusiast

Snakes709

Posted
Posted (edited)

I have a 2019 sierra at4 that I am removing the lift kit and lowering for multiple reasons, main one being my back injury and sciatic nerve constantly going crazy, which makes it hard to get in and out of the truck. I already removed the rear blocks, currently still have the rancho shocks still installed. I have bilstein 5100 front and back shocks/struts ordered for a base sierra, currently on back order until the end of the month. Talking to the custom department at the dealership about drop shackles to level the truck out once fully lowered, he mentioned ill most likely need shims because of a driveline vibration because im dropping that low. Didnt have time to fully discuss it so im wonder what shims and where do they get installed?

9181A49E-3E1D-4FE9-963B-4614646CD059.jpeg

Edited by Snakes709
mafd2 Senior Enthusiast

mafd2

Posted
Posted

If you're just using drop shackles in the rear, you don't need shims. Just spin the existing shim 180° and that gives you the correct angle. 

Snakes709 Enthusiast

Snakes709

Posted
  • Author
Posted
26 minutes ago, mafd2 said:

If you're just using drop shackles in the rear, you don't need shims. Just spin the existing shim 180° and that gives you the correct angle. 

I havent messed with leaf springs before. Where are said shims?  

mafd2 Senior Enthusiast

mafd2

Posted
Posted

That thread is for lift blocks and not lowering and shims. Here's a pic of the shim (vice grips shown attached to the lower tie bolt and socket on the top). I have the 2" Wulff shackles on my 19 RST. There's a drop shackle thread on here. I'll find it when I have a chance. 

 

 

IMG_20210705_172441.jpg

lowpro Enthusiast

lowpro

Posted
Posted

 

4 hours ago, mafd2 said:

That thread is for lift blocks and not lowering and shims. Here's a pic of the shim (vice grips shown attached to the lower tie bolt and socket on the top). I have the 2" Wulff shackles on my 19 RST. There's a drop shackle thread on here. I'll find it when I have a chance. 

 

 

IMG_20210705_172441.jpg

 

Obviously that thread wasn't talking about lowering but there is good info regarding shims which is what his last question was about...

 

Here is one on drop shackles specifically:

 

mafd2 Senior Enthusiast

mafd2

Posted
Posted
13 minutes ago, lowpro said:

 

 

Obviously that thread wasn't talking about lowering but there is good info regarding shims which is what his last question was about...

 

Here is one on drop shackles specifically:

 

I understand. Lift blocks do require an opposite pinion angle than lowering. My '19 RST didn't have any blocks and only a shim. I don't think the 4X4 has a factory shim.

Snakes709 Enthusiast

Snakes709

Posted
  • Author
Posted
7 hours ago, Delson0 said:

That picture is w/o the rear blocks then?  
How much lower are you wanting to go?

Yea that picture is without blocks but still with the rancho shocks.  2” drop front and i guess 4” drop in the rear as long as it doesnt cause any issues

dirtfan21 Senior Enthusiast

dirtfan21

Posted
Posted

I installed 1.5" rough country drop shackles on my 2020 4x4 RST and had the driveline vibration around 20-30 mph. My truck did not come with shims. I ended up pulling the drop shackles and went back stock for the time being. I now have 2 degree and 4 degree belltech shims sitting on the work bench at home, just haven't had the time to measure driveline angles and do the work.

 

It appears the u-bolts are one time use as well. Can anyone confirm this so the OP has the correct info?

mafd2 Senior Enthusiast

mafd2

Posted
Posted
3 minutes ago, dirtfan21 said:

I installed 1.5" rough country drop shackles on my 2020 4x4 RST and had the driveline vibration around 20-30 mph. My truck did not come with shims. I ended up pulling the drop shackles and went back stock for the time being. I now have 2 degree and 4 degree belltech shims sitting on the work bench at home, just haven't had the time to measure driveline angles and do the work.

 

It appears the u-bolts are one time use as well. Can anyone confirm this so the OP has the correct info?

U bolts one time use?  

Snakes709 Enthusiast

Snakes709

Posted
  • Author
Posted
4 hours ago, dirtfan21 said:

I installed 1.5" rough country drop shackles on my 2020 4x4 RST and had the driveline vibration around 20-30 mph. My truck did not come with shims. I ended up pulling the drop shackles and went back stock for the time being. I now have 2 degree and 4 degree belltech shims sitting on the work bench at home, just haven't had the time to measure driveline angles and do the work.

 

It appears the u-bolts are one time use as well. Can anyone confirm this so the OP has the correct info?

They are one time use but thats not an issue. There is a local shop that makes u bolts in 15mins for $30 (bolts and washers included). Thats what is installed right now so if I have to get another set made up, not an issue. 

dirtfan21 Senior Enthusiast

dirtfan21

Posted
Posted
On 7/6/2021 at 10:18 AM, mafd2 said:

U bolts one time use?  

 

Yes, torque to yield or in other words they stretch when torqued. Past generations our our trucks that was the case. Wasn't sure if the T1XX platform was the same.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,739
    Total Members
    8,960
    Most Online
    chfkief
    Newest Member
    chfkief
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,693 Guests (See full list)

  • Latest Articles

  • Posts

    • Chuck FB
      Joke Thread

      By Chuck FB · Posted

      Fred was in the fertilized egg business. He had several hundred young pullets, and ten roosters to fertilize the eggs He kept records, and any rooster not performing went into the soup pot and was replaced. This took a lot of time, so he bought some tiny bells and attached them to his roosters. Each bell had a different tone, so he could tell from a distance, which rooster was performing. Now, he could sit on the porch and fill out an efficiency report by just listening to the bells. Fred's favourite rooster, old Butch, was a very fine specimen, but this morning he noticed old Butch's bell hadn't rung at all! When he went to investigate, he saw the other roosters were busy chasing pullets, bells-a-ringing, but the pullets, hearing the roosters coming, would run for cover. To Fred's amazement, old Butch had his bell in his beak, so it couldn't ring. He'd sneak up on a pullet, do his job and walk on to the next one. Fred was so proud of old Butch, he entered him in the City Show and he became an overnight sensation among the judges. The result was the judges not only awarded old Butch the "No Bell Piece Prize," but they also awarded him the "Pulletsurprise" as well. Clearly old Butch was a politician in the making. Who else but a politician could figure out how to win two of the most coveted awards on our planet by being the best at sneaking up on the unsuspecting populace and screwing them when they weren't paying attention. Vote carefully in the next election, you can't always hear the bells.
    • chfkief
      FS: Black Bear Performance AutoCal Tuning System

      By chfkief · Posted

      Do you still have?
    • 3CarSeatDad
      High Country Suburban build confirmation

      By 3CarSeatDad · Posted

      Can someone confirm if the GM order workbench terminal is able to validate a custom build sequence:   1) Initialize the Allocation Base: Open a new vehicle build queue, select the 2026 Chevrolet Suburban 4WD, and pick the High Country (3LZ Preferred Equipment Group).   2) Select the Diesel Powertrain: Go directly to the engine configuration screen and choose RPO code LZ0 (3.0L Duramax Turbo-Diesel). Ensure it maps to the MHS 10-speed automatic transmission.   3) Deploy the Seating Swap: Navigate to the Interior Options screen and enter RPO code ATT to replace the standard captain's chairs with the power-release 60/40 bench seat. Because you are not trying to force a separate luxury or air-suspension bundle, the standard, premium D07 Fixed Floor Console remains active. The system will accept this change immediately without triggering a warning message.   3)Apply Heavy-Duty Hauling Capability: Input RPO code NHT (Max Trailering Package). The commercial terminal will automatically bundle the required trailering hardware and software modules to support the diesel engine's maximum towing capacity.   5) Layer the Premium Tech and Glass: Separately add code C3U (Panoramic Power Sunroof) and code UKL (Super Cruise) to the order screen.   6) Run the Final Validation: Click the "Validate Order" button at the bottom of the interface.
    • revmanii
      Looking at ordering a '26 WT because I want a std cab, std bed

      By revmanii · Posted

      Spent the last hour or 2 googling and reading up on the spacer thing. I don't like the loss of thread contact on the slip on spacers, but it appears you can get "extended" lug nuts that reach into the hole of the wheel to get back the lost threads. Looks like the only true hubcentric slip on spacers are at least .375". I'd want as little as I could get away with and don't want to cause other clearance issues going any thicker. Bora seems to offer what appears to be a well made .375" spacer and extended lug nuts. I searched here and did find a couple threads recommending Bora. But not cheap. By the time I buy spacers and lugs, new TPMS sensors, then pay a tire shop to install the new sensors, I suspect I'm going to be in over $400. Thinking about running out and getting some washers to put behind the wheel to see if .375" is enough to clear calipers, turn lock to lock without rubbing, and to see if the wheels/tires look strange pushed out a little. This would just be to check fitment.
    • Core-Lokt
      Road Master Active Suspension

      By Core-Lokt · Posted

      Roadmaster makes some quality parts; I have their sway bar. I considered the RAS, but I ended up bagging. I didn't know what kind of ride I'd get with RAS, and the bags have interior jounce bumpers, so I can run 0 pounds pressure. I figured I'd have the best of normal suspension ride with assist on-demand. But it seems you got pretty much the same in one item.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...