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DonM · 01-12-2025, 06:29 AM

About 3,000 miles ago, I had a brand new posi differential installed in my '17 because the previous owner partially grenaded the original unit (there were chunks of pinion ring coming out when the drain plug was pulled).

I had my preferred shop install the new unit ($3,100) and they said I should change the fluid after a thousand miles or so - but I didn't realize how much I was actually driving the car, so I hit 3K.

The shop wants $130 to change the fluid, but I have "rediscovered" doing the work myself and I bought 2 qts of the correct gear oil for just under $50.

I know ideally, the car should be on a lift, so it's level and you get the best drain of the old fluid, but that's not an option. I do have ramps that will fit under the rear of the car, but then that puts the drain plug higher than the bottom of the diff and won't let me get a complete drain. Am I just over-thinking it and will it be OK to have the rear end higher than the front of the car?

01-12-2025, 06:29 AM	#1
DonM Camaro #4 Drives: 2017-Hyper Blue Metallic-2LTmanual Join Date: Dec 2015 Location: NE Ohio (Akron) Posts: 1,256	Advice on changing diff fluid? About 3,000 miles ago, I had a brand new posi differential installed in my '17 because the previous owner partially grenaded the original unit (there were chunks of pinion ring coming out when the drain plug was pulled). I had my preferred shop install the new unit ($3,100) and they said I should change the fluid after a thousand miles or so - but I didn't realize how much I was actually driving the car, so I hit 3K. The shop wants $130 to change the fluid, but I have "rediscovered" doing the work myself and I bought 2 qts of the correct gear oil for just under $50. I know ideally, the car should be on a lift, so it's level and you get the best drain of the old fluid, but that's not an option. I do have ramps that will fit under the rear of the car, but then that puts the drain plug higher than the bottom of the diff and won't let me get a complete drain. Am I just over-thinking it and will it be OK to have the rear end higher than the front of the car? __________________ Don M Supercharged LGX + 6 speed manual = FUN!!