I got my 2000 4 ltr tj on the road.I only drove it before I bought it up and down a lane because it was bought as is with no plates on it last winter. I knew it needed frame repairs ,brake lines etc.It had a low mileage motor. Just got it safetied a few days ago.I left the carpet out so they could see the floor pans I replaced and the rear floor area condition. When I drove it to the shop it had a lot of noise up front. When I put the carpet in after the safety it got a little better . I guess it must be normal but I guess there is only the carpet to deaden the sounds up front or could it be better with some sound deadening foam on the firewall.All the fluid levels are ok in the diffs and transfer case.