Im about to buy a 97 blazer. and the lady says the rear differential is going out. She says theres a "roaring" noise from the back, it this correct for the problem? how would i be able to tell by driving and is it expensive to fix???

 

I had a pinion seal take a dump on me once in my 91 2 wheeler and it sounds about right. I just went and got another rear end from a junkyard and had it going the next day. Sounds like the problem here but I'd open the plug and pour in some 85W - 90 gear oil and see wheree it's running out. Depending on overhauling the present rear end or a junkyard used one it can be expensive (overhauling what you've got) or replacement ($150.00 with a guarentee), Either way don't drive it too fast or for a long distance.

 

Yep sounds right to me to. The only outcome of a rear "roar" is a bad diff in my experience. The cost factor is depended upon you really if you can rebuild it yourself or swap another in it won't cost a whole lot, how much you paying for the truck itself?

 

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