I have a 79 that I want to change the rearend grease in but have looked at manuals and the rearend and can not find a drain plug. Is there one?
There is a drain plug......it's also the fill plug.....way to go Chevy on that one. It's a pain in the butt to change the fluid, and what I've done is pump it out with a vacuum pump. I recommend using 2 tubes of BG additive to your rear end, if you have any chatter. I did, and the noise literally went away after driving a half a block. The regular GM diff additive just doesn't seem to do the job for mine.