Quote:
Originally Posted by trz174
I just did it on my 18 ZL1. Maybe 30 mins once it’s setup to start work. I just took it off the lift so no photos.
The differntial drain plug is on the rear at the bottom and is removed with a 3/8” rachet (square hole). After it drains and you put the drain plug back in (snug, don’t squeek it), fill it with fluid. The fill hole is on the drivers side about half-way up the differential and you need to use a 5/16” or so hex wrench. It took about 1 2/3 bottles of GM differential fluid. I bought one of those fluid transfer hoses from Advance Auto. It screws on top of the bottle and has a 16” clear line. Hook the fill hose to the bottle and position the bottle near the driver side wheel and the clear hose goes almost straight into the fill plug. Squeeze the bottle, be patient and let air in the bottle until it’s empty. When the differential is full (second bottle), fluid will leak out of the fill hole into the drip pan or on to the floor if you forgot that part. Let it run out of the fill hole until it stops, clean everything up with brake cleaner and put the fill plug back on and snug it up.
NOTE: There is a small fill hole on the passenger side of the differential near the top that IS NOT (REPEAT NOT) the differential fill. This plug is for the differential cooler and uses transmission fluid.
Hope this answers your question. Good luck!
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It does! Thanks for the help. This is what I thought, but I haven't done this yet and wanted to be sure.