My NAG 1 transmision from an 09 challenger has the same end on it. I went to a place near me called shaft masters. The told me no problem. They would make me a custom aluminun drive shaft that was splined and slip in and out of it self a little. They would make a cnc aluminum adapter to fit on the end of the trans with a yolk for a ubolt to bolt up to the drive shaft. I asked about modifying the driveshaft that was from this trans and he said his would be much stronger. Price was about $450. I have not had it made yet since I dont have the measurement to give him yet