The 2.74 low gear set's sun gear is the key. Look at the front half of the sun gear, if it is bigger than the back half, it is a 2.74 low gear. If the front and back of the sun gear is the same diameter, then it is a 2.45 low gear set.

here is a link for good info -

http://www.forabodiesonly.com/mopar/thre...th-pics.307306/


Post #11 shows a close up of the sun gear

John