Thanks for the reply. The noise I am getting is a hum or growl that is noticeable between 10 and 20 MPH. Less than 10, you can't really hear it, and over 20 there's too much road noise to hear it. It changes with speed, i.e., slows down upon deceleration and speeds up with acceleration. I took the driveshaft off, and there's a lot of backlash evident. Tried replacing the inner and outer wheel bearings, but it didn't make any difference. (A mechanic buddy of mine tells me that it's better to swap the whole differential out rather than try to align those bearings perfectly, which he says is near-impossible.)
Like Gramp always told me, "If it has teats or wheels it'll give ya trouble!"
So, like I mentioned earlier, I have a '94 Blazer for a parts vehicle. I took the rear differential off this afternoon and am cleaning it up to put on the Bravada.
I'm going to try to swap the front differential later. Unfortunately, it was already swapped out before but apparently they put in one with the wrong gear ratio, because subsequently the Bravada started eating prop shafts (at about $350 per copy). The Bravada prop shaft had a double cardon on the back (at the transfer case) and a CV joint at the front differential, because it was constantly in AWD mode. The Blazer I'm using for a parts truck is the one that has the electric/fluid clutched transfer case and a solenoid in the front differential (I think). Notably, the Blazer prop shaft has a double cardon at each end.
The main thing that concerns me is that the Blazer font differential won't be able to stand up to the strain of all-time, all-wheel drive.
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