Both my rear shafts or the same length. It you have and ofset pinion the you can make both of them the same lenght. I have 6lug on mine. Just used cheve caliper and roter and welded a bracket on. But think about the what you are gong to do in the front latter. Tire size steering. You may wont to go wider in ther rear now. Find a complet rearend for about 100 put get new shaft and do your brakes and run it for now. Upgrade latter if you dont have the money right now. The key is getting to wheel. If you have to go with new shafts do the 35 spline not much more and a spool. Then latter all you need is a center section. wheel spacer on the front and you are good. Troy ran a stock center for a long time. Or run the stock shaft and have them drilled to 6 lug and weld up the spider gear. You can maybe do all that right now for less than 500.