Will I need a new tune??

[97xl]

Thanks Bill,

Old:

3.08 open diff 265/70r16 tires 30.61"

New:

3.73 LS 265/70r16 tires 30.61"

Update. I spoke with Eaton directly and they said 99.9% that the reason I've got the noise is because they used synthetic diff fluid. They said only use conventional. Was told it will make a small amount of noise when turning but other than that there should be no noise if the gears are setup properly. Also that its possible to take the exciter gear from the old rear diff and install it on the new one so the ABS will work. I called the shop today to make sure they still had my old parts, which they do, so this should be getting fixed tomorrow.