Level 10 does not give you a new trans, they rebuild your trans. You either send them your trans or drive your car to them to do it.
I drove to New Jersey and watched them rebuild mine. It's the best way because they test drive the car after the rebuild and fix anything wrong on the spot. The kit they used for the seals had an incorrect axle seal. It leaked like mad on the test drive. They removed the axle and put in the correct seal at no extra charge.
Their stuff is strong! They had opened up the auto trans from a Toyota Supra turbo which they rebuilt. It was making over 600HP and tore the teeth off some gears, but the clutch packs held.
When I was at Level 10, they paid for a dyno run in order to get the high stall torque converter matched to the engine. Unfortunately, I must have gotten a bad tank of gas, and the engine developed a massive miss at 5500rpm on the dyno. Two of the spark plugs had the electrodes blown away (can you say detonation?).
At 6.5# of boost, the horsepower was rising at 5500rpm when the engine quit due to the blown plugs and read 185hp. It probably would have peaked out somewhat higher.
You can get a complete trans for $3264 (which is what I got, but I paid less than that)
A trans kit for $729 (install it yourself)
A valve body reprogram for $698 (send them your valve body)
A high stall torque converter for $498 (send them your converter)
(Total $1925 and you do the work)
I had a problem on the way home from New Jersey after the installation at Level 10. The external trans cooler I used was not enough in the mountains of Virginia and the trans got hot.
With a high stall torque converter, there is a great deal more heat generated. In hilly country at low speeds (below where the torque converter will stay locked up) the converter is slipping a great deal when going uphill. It was made worse since I am using the Nissan Mototsports radiator which does not have the trans cooler in it so all the cooling is from the external cooler.
I cured this by adding a second cooler and added fan cooling both of them. You can see them here: