I did an 8.8” swap in my swap build, cleaned the inside of the differential and carrier unit. Filled it back up with synthetic gear oil and fiction modifier. With the rear wheels on the ground I can turn the driveshaft through the transmission but the wheels won’t turn. I can heard something in the differential, which I’m thinking is the LSD clutches slipping. I’m thinking of rebuilding the LSD with new clutches and trying to load them a little tighter so they will have more bit. Any advise would be great, unless the factory LSD aren’t worth a ****. Or maybe upgrade to a Yukon dura-grip lsd or an Auburn??