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Message: <blockquote data-quote="MustangChris" data-source="post: 603551" data-attributes="member: 10830">^ yes. your backlash is off.For a budget build, you dont really need to throw in 31 splines, but if you do, you will need to get 31 spline differencial to match up with it.Jegs has a number of t-lok diffys available in 31 spline. I personally went with americanmuscle's 31 spline eaton true-posi set up and I have loved it.for a rebuild you will need:depending on the wear and tear on the gears:gearsbearing/disc rebuild kitgear lubeRTV Sealantif you want to upgrade:gears (suggest a faster ratio, such as 3.55:1, 3.73:1, or 4.10:1)differencial (suggest posi differencial)axles (suggest 31 spline. 33 is overkill and they are hard to find diffys for)bearing kit (i think... lol its been a few years since i had mine done)fluid (suggest royal purple)posi additive (suggest ford racing... *if* you get a posi diffy)and since you are already there i suggest a differencial girdleRTV Sealantand, once again. since you are there... ARP lug nut studs <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>