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I build my own rears simply for the sake that I don't trust anyone else to do it. It really is not that hard, but very time consuming. Changing a carrier is easy, when you get into changing gears, well that's another story. If any and I mean any of the readings are off, you will get noisy gears and possible bearing or gear failure. If you just want to simply pull the axles out and replace the seals and axle bearings, that's no biggie. If the oil looks good, IE not black or filled with metal filings, I would just put some fresh 90W in there and button it back up. Don't go to replace the pinion seal unless you have a torque wrench that measures in inch/pounds. The preload needs to be correct or pinion bearing failure will occur. The general reading is around .020"-.025".
I recently redid the 12 bolt in my 70 and it took me a full 10 hours to do it start to finish and that did not include the R & R from the car.
Tom
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