Is this a good deal on Dana 44 and Dana 30 axle combo with 3.55 gears?

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.
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.