How many quarts of gear oil do you need to put in the rear end a 1998 Chevy blazer?

A 1998 Chevy Blazer's rear differential capacity depends on whether it has a 8.5-inch or a 10-bolt rear end. There's no way to know for sure without checking the vehicle's specifications (often found on a sticker under the hood or in the owner's manual) or looking at the differential itself.

Therefore, I cannot give you a definitive answer. To find out how much gear oil is needed, you should:

* Consult your owner's manual: This is the best source of information.

* Check a reputable online parts store: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to select your vehicle's year, make, and model to find the correct specifications, including differential capacity.

* Look for a sticker on the differential itself: Sometimes the capacity is printed directly on the differential housing.

Once you determine the type of rear end, you can find the correct capacity. Expect it to be somewhere between 1 and 2 quarts. Always double-check before adding oil.