Sorry if I missed this somewhere else. The threads I found were old, so I wasn't sure if it should be asked again.
I'm going to change the front and rear diff fluid. One asks for 75w-90 (front I think), rear 75-w85. The 85 is harder to find and more expensive. Does anyone have any info about using the 75w-90 in the front and rear? The way I understand it is the 85 oil may provide better fuel economy but probably not enough for me to bother with. I just want to make sure it will not ruin anything else?
The second part is, does the rear need a fluid with the limited slip additive or does it matter. The local store has the -90 but it says it has the additive, do I need this one, or one without it? Or maybe it doesn't really matter. I know it was an issue in my 01 Grand Cherokee with front and rear limited slip diffs. If you didn't have enough additive it would chatter and make horrible noises, if you had too much it wouldn't engage properly.
Mine is a 2015 Tahoe w/ the G80, 100k miles. Thanks in advance.
I'm going to change the front and rear diff fluid. One asks for 75w-90 (front I think), rear 75-w85. The 85 is harder to find and more expensive. Does anyone have any info about using the 75w-90 in the front and rear? The way I understand it is the 85 oil may provide better fuel economy but probably not enough for me to bother with. I just want to make sure it will not ruin anything else?
The second part is, does the rear need a fluid with the limited slip additive or does it matter. The local store has the -90 but it says it has the additive, do I need this one, or one without it? Or maybe it doesn't really matter. I know it was an issue in my 01 Grand Cherokee with front and rear limited slip diffs. If you didn't have enough additive it would chatter and make horrible noises, if you had too much it wouldn't engage properly.
Mine is a 2015 Tahoe w/ the G80, 100k miles. Thanks in advance.