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UCA for 2020 AT4 vs 2024 AT4/AT4X and end links

calgator73
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calgator73 Senior Enthusiast

calgator73

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While investigating possible causes for my suspension popping/clunking noises I came across something interesting.

 

GM does not list a specific unique UCA or end link for the 2020 AT4. (see 85660607/85660606 for UCAs and 84367821 for end links for all sierra 4wd)

 

GM does however list unique parts for the 2022.  (see 85660608/85660609 for UCAs and 85590925 for end links)

 

The end links for the 2024+ are about 2" longer.

Knuckles are the same.

 

Background my truck is an AT4 and I installed the AT4X GM Accessories suspension package.  That package was limited to springs and shocks.  Same ride height more wheel travel.

 

My understanding was that the AT4/AT4X called for specific UCAs and end links to compensate for the 2 inch lift. 

 

What changes were made to the trucks to require new UCAs for trucks with 2" lift?

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