what size?
 

getting ready to change fluids. trying to find out what size allen wrenches or hex sockets are needed to open the fill plug and drain plug of the transfer case as well as the check/fill plugs for the front and rear differential.

Get under there and look! Transfer case use's a pretty big socket 13/16 or 1 1/16 I believe. The front diff fill on my 95 blazer is a 13mm 6 point. Rear is 3/8 square drive. Im pretty sure!

oh i was under there... i actually had a hard time finding the rear diff drain/fill under all the grime on it. once i wiped it clean and inspected it and the front diff and transfer case i knew they were sizes i dont have. square drive on the rear? i could have sworn they are all allen/hex. i was hoping someone would know the exact sizes off hand. i didnt wanna buy a whole set of large allen keys right now. figured i would buy or maybe even borrow the 2 or 3 i need and thats it.

...on second thought i might invest in large sae/metric set.

i appolgize to the administrators/moderators for posting this thread under the wrong catagory =)

ok here it is: (for my truck at least. other blazers may differ.)

*3/8 square drive on the rear differential drain/fill plug

*15mm socket or open/box end wrench on the front differential drain/fill

GM-89021671 (old gm-1052271) fluid 80W90
1.5 quarts in the front and 1.75 quarts in the rear
DO NOT USE LIMITED SLIP ADDITIVES


*10mm allen/hex on the transfer case drain and fill plugs

GM-12378508 (old gm-12378396)
2 quarts

Thanks for those part #'s man.

I got one right on your blazer!

Im not joking either, my TransferCase has 13/16 fine thread bolts. No allen heads, Sorry I could'nt help you with that size.