The last I heard about the welded turf savers is that they do not hold up. You are looking at 350-400 dollars in parts to swap to the XT locked rear end. Keep in mind that only 700 XT, and XTX's used a 3.6 rear gear, any other ratio would not be compatible with the 700 front differential. I bought a 3.6 rear gear, and two complete axles for mine for the price I listed. You could shave a little off of that buy just buying inner CV Joints, but for 30-40 dollars difference I bought complete axles. I'm still using my Turf Saver with 6,000 plus miles and have not had any problems to date. I change my rear lube 3 times a year with the AC Friction modified rear end lube. I've been told I could use another gear lube but did not want to take any chances. I can lay into mine from a dead stop, and it will leave two firm tracks in the gravel/lawn. I really like the turf saver, no chatter on turns on pavement!