Hi
The New Vanguard book on the Pershing has a couple of pictures from Korea of M4A3105 operating with Marine M26s. Can't see much of the suspension (front and rear views only) so I'm only guessing it is HVSS. The link below has some pictures of the remains of one that is HVSS.
http://www.toadmanstankpictures.com/m4a3105.htm
Geoff