2003 blzr 4x4 4wd
Does my front and rear diffs have drain plugs and fill plugs?
Thank you in advance.Tony.

 

They should both have fill plugs but I'm not sure on the drain plugs

 

The front will have a fill and a drain. The rear is a real crap shoot. I have had 4 S10 ZR2's all of different years, only my 2000 has a rear drain plug. You will just have to look.

 

As stated above, the front diff has drain and fill plugs. The rear diff only has a fill plug, drain by removing cover.
The front diff is filled in two ways: get a hose that will wedge into the fill port or just use the vent hose already there, clamped to the radiator shroud.
The rear requires a hose to fill as well. Be sure to get a new gasket for the rear cover. If the rear cover is really rusty, easier to just get a new cover.

Did this job on my '02 last year. Not a bad job....bit messy, but not bad. Do the transfer case at the sametime. Note: transfer case uses a different lube than the diffs.

 

Did the front and trans case yesterday... 13 mm drain and 15 mm fill on front(1.3 Qts)..trans drain and fill was a large allen wrench(1.5 Qts ish)...1 1/2 hr labor after clean up...ill do rear next pay day...