They used lots of T34's in various configurations usually with Turret removed as heavy haulers. I have also read that during Kursk the 2nd SS overan a Russian repair depot and found a couple of dozen operational T34's and used them in a night attack where they destroyed and overran Russian positions before the Russians realized it was Germans operating the equipment!
On another piece of equipment I remember reading they captured like 15,000 76.2mm AT/HE guns and rechambered them to take PAK 40 ammo. They were found as far a field as North Africa!
"There are things in Russia which are not as they seem..."
Georgy Konstantinovich Zhukov
Too many tanks, not enough time....