Torsion keys - Chevy and GMC Duramax Diesel Forum
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post #1 of 10 (permalink) Old 09-07-2019, 03:30 PM Thread Starter
 
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Torsion keys

I rebuilt my front end new control arms upper and lower and now I cant get my front end to come back up do I need new keys
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post #2 of 10 (permalink) Old 09-07-2019, 09:31 PM
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Probably need new bars


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2015 2500 HD LTZ
Cranked keys w/ Bilstein 5100s
Toyo M/T 275/65/20
Windshield tinted 35%
fronts 20%
and rears are 2%
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post #3 of 10 (permalink) Old 09-08-2019, 08:29 AM Thread Starter
 
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Why is that are you suppose to change bars out they dont have much play in them
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post #4 of 10 (permalink) Old 09-08-2019, 06:39 PM
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Is the lower control arm keyed correct to the torsion bar? It could be in the wrong position when replacing lower control arm. The keys can't wear out.

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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post #5 of 10 (permalink) Old 09-09-2019, 10:30 AM
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I would agree. They can slowly sag with time but if this was a sudden change, they werenít reinstalled with enough preload so you canít twist them enough with the torsion bolts/keys to get your ride height back.

2015.5 Denali HD Duramax 4x4. 4.56 gears and Detroit tru-track. Duramaxtuner EZ Lynk +110hp. Airdog II 4G. Banks CAI
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post #6 of 10 (permalink) Old 09-10-2019, 11:28 AM Thread Starter
 
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I put new keys in and didnt help I can get the passenger side up but not the driver side it was a sudden change I had 35 on my truck with no issue but sence the rebuild I cant get it level
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post #7 of 10 (permalink) Old 09-10-2019, 12:49 PM
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As in issue after rebuild? What was rebuilt? Control Arms removed?

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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post #8 of 10 (permalink) Old 09-11-2019, 04:47 AM Thread Starter
 
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Yes control arms were removed and new ones were put on
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post #9 of 10 (permalink) Old 09-11-2019, 11:55 AM Thread Starter
 
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New upper and lower control arms
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post #10 of 10 (permalink) Old 09-11-2019, 01:19 PM
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So the torsion bar is key to the lower control arm. It should be keyed in a way that when the suspension is fully unloaded it still had load on the bar. If this is keyed back into the control arm incorrectly, it wont have this preload anymore.

2005 Silverado 2500, Crew Cab Short Bed. 122,000 miles
MODS: AFE intake, LBZ mouth piece, MBRP cat- less exhaust.
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