The occasional tank or airplane didn’t make much impact for the Soviets. Soviet weapons were pretty high quality and obviously high quantity. The trucks were a huge difference, but there were a lot of little things we provided. Food, cloth fabric for uniforms, boots, radios, and waterproof telephone cable were all things the Soviets needed but couldn’t make. It wasn’t so much a lack of know-how as much as the destruction and dislocation from the German invasion limited what the Soviets could make. They chose to make weapons, we supplied the rest. It was a sensible arrangement.
The First Moscow Protocol was mostly filled by the British. We didn’t have the means built up yet to supply all the necessary Lend-Lease materials. Hence the Churchill IVs going to Archangel.
I think one of the most important components sent were the variety of machine tools. The Soviets used these to get the relocated factories online a lot faster than they could have done on their own. It played a critical role that was completely denied by the Soviets after the war was over. It wasn’t until the Russian archives were temporarily opened that the real impact of these components became known.
I read a scholarly article on this a while back. If I can remember where the heck I found it I’ll link it to you.