Thanks for the info guys. The measurments are form the flange where the backing plates bolt. I dont know about the pinion offset. I didnt Narrow the rear. I took it in on trade and have it for sale. Someone who is interested in it wanted to know about the axel length. I will pass on the info. I think he already has some axels that he would like to reuse. My advice would be take to a rear end shop and let them fit it with correct axels. Again thanks for the info.