Most transmission jack adapters have the same basic construction, with a base plate, four retaining/support tangs at the corners, and a safety chain to help prevent drops. Many have adjustable sliders so you can pinch the tangs tight to your transmission, and most have plates that can be tilted and locked into place using knobs, bolts, or wing nuts. Before purchasing a transmission jack adapter, determine the weight of the load you’ll be supporting with it and make sure the adapter you buy and the jack you’re using have at least that much capacity. For example, GM’s TH400 transmission weighs 135 pounds dry, and the Mopar Torqueflite 727 comes in at about 161 pounds.
Transmission jack adapters range in price from about $50 to $300 and come in capacities of up to 1,100 pounds. The $295 adapter from 911 Motorsports has a perfect 5 out of 5 rating from all three buyers who left reviews and a capacity of 800 pounds. The highest-rated transmission jack adapter we could find at a more affordable price point was the one from Performance Tool that sells for $88.48 at Walmart. This adapter has an average rating of 4.4 out of 5 stars and a maximum capacity of 1,100 pounds.
