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post #1 of (permalink) Old 11-24-2000, 12:33 PM
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Rear Differential questions replacement

I posted earlier about noise coming from the Rear End (Drivetran help! Th-Thunk Thread -and thanks again for the replies). My s-10 is an 84 Blazer 4x4 with a 2.8 and a 5-speed transmission.
I opened up the rear and found that the Ring Gear has 4 severely damaged teeth (in a row) and the Differential Unit has several hairline cracks. New parts from Chevy are over $700 for what I need. I can get a used rear end from the Salvage yard for $200 but I have a few questions. This truck is a winter beater but I may do a 350 swap in the future, but I need to do this repair as cheaply as possible.
What is the gear ratio on this truck, or how can I find out what the Gear ratio is.
Should I swap the whole Axel, or can I just transplant the parts I need out of the Rear end that I get from the yard?
I have been considering putting a 350 swap. With that in mind, what kind of year and make of axel (from the donor vehicle) should I look for that have the same ratio? A posi with rear disk maybe? In other words, if I am going through the trouble and the rear ends are similar in price what kind of things should I look for?
What would you do?
Thanks again for all of the help and comments.

84 s10 Blazer 4X4 2.8 5 Speed
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