When I had the spring replaced on my garage door (the kind that winds up, definitely a scary thing to try yourself) the repairman used a portable impact wrench to remove some of the nuts and lag bolts. Nice tool. Was looking at getting one for myself. Seems that they come with 1/4" hex, 3/8" and 1/2" square drives. They 12v models also generate 90 to 100 ft-lbs torque. I have both 3/8 and 1/2 sockets and it seems to me 1/4" hex is too small for that much torque and less convenient for sockets. Last time I changed my oil had a hard time loosening the drain plug. I just drive one side of my car up on 3 2x6 's I nailed together so don't have much room to get much leverage. Thought the impact wrench would work well for this situation.
Any advice on type of drive and brand would be appreciated. Am leaning to a Makita as I have a 12V portable drill and have seen drives without batteries and charger for sale on ebay. In the store they are close to $200 so would like to save some $.
Thanks in advance.