[Val Walkinshaw]

Originally Posted by ctrlz

Is there a separate vent at the top of the diff? Your logic makes sense, but I also thought removing upper plug allowed the fluid to drain faster.

You're both right.

[Chutzpah]

Easiest way for me to get the car relatively level and have enough room to work: Back car down an incline, place ramps behind rear wheels, place a small level on the window sill, back up ramps.

[raptor5244]

Originally Posted by Chutzpah

Easiest way for me to get the car relatively level and have enough room to work: Back car down an incline, place ramps behind rear wheels, place a small level on the window sill, back up ramps.

Just did the same. Put the ramps at the bottom of garage lip and backed up them a bit until I can fit under. It was level enough to do the job.

[raptor5244]

[QUOTE=Christian1LE;11179284]I have a couple of videos that might help you, first one is just to show the jack points, and the second video shows the DIFF fluid change (I use a Quickjack + Jackstands). Good luck. I tried to make them to the point w/o any fluff.

Thanks for the great videos. I just did the diff fluid on my 2021 ZL1. Nasty sludge on both plugs with only 2500 miles. That is some expensive fluid, $26.33 per quart on Amazon.

Has anyone done multiple changes and noticed if the sludge stops building up?

[s346k]

Originally Posted by raptor5244

Has anyone done multiple changes and noticed if the sludge stops building up?

i have changed mine several times (annually). the sludge hasn't stopped yet. ive made a few posts in the trans section about it.

[raptor5244]

Originally Posted by s346k

i have changed mine several times (annually). the sludge hasn't stopped yet. ive made a few posts in the trans section about it.

Interesting, I guess these gears just continue to wear hence the two magnetic plugs. Good call on changing this annually. I am surprised it is not recommended to do so in the manual.

[Ryfly05]

Originally Posted by raptor5244

Interesting, I guess these gears just continue to wear hence the two magnetic plugs. Good call on changing this annually. I am surprised it is not recommended to do so in the manual.

It is clutch material not gear material hence why it doesn't get better.

[raptor5244]

Originally Posted by Ryfly05

It is clutch material not gear material hence why it doesn't get better.

Good call.

[CreeperRS]

That’s too much work for differential oil swap. I jus lay a piece of cardboard under the rear of the vehicle and use a ratchet and extension, a small oil pump, 30 min later done. No jacks no lifting the car. Not that hard unless your pushing over 200 Lbs. and can’t fit under the car.