Thank you I was going to ask about gear lube. I am the installer so no worries there! what kind of break in is recommended? I am rebuilding the engine and doing synchros on my trans so I will be doing a 500 mile break-in for those anyways.You can reuse your spider gears if they're in good condition. But new spider gears are neither expensive nor requiring of any break-in. Nice choice of the E-Locker and Super 35 with 4.88 RGA gears. Make sure you insist on the installer filling the axles with CONVENTIONAL GL-5 gear lube like an 85W-140. Don't let them use a synthetic gear lube no matter what they claim or say, it's especially critical you do so during the break-in process.