My rear differential in my 2006 niisan xtrail is completely gone and makes a terrible grinding noise and stutters my car a bit(I'm not driving it right now). but my car has fwd and 4wd mode and I was wondering if it would be fine to somehow take all the guts out of the rear differential so it doesent affect my driving and just run it in fwd mode.

Not sure if this is the right place to ask but my engine blew and is covered under warranty but I just found out that the shop that did my last oil change entered my mileage wrong by 2k miles. So on paper it looks like I got my oil change 2k miles past due. Actual mileage was 104k and they put 106k. Currently at 110k. Will this void my warranty and if so is it fixable? The shop said they can’t change the mileage on the receipt/record.

This is in my 2008 Ford Explorer XLT Eddie Baurer edition. Only lasts a few seconds then it’s all back to normal until a few minutes later when it does it again.