1 View. 1 View. When hiring the gas I think I heard the buzzing. It sounds to be coming from the front half of the car - I can feel it vibrating a little near the driver side. The worst complaints are engine, accessories - interior, and transmission problems. The problem: I have 2003 Subaru Forester with about 100k on it, with auto-trans, and there is a whining gear lash noise coming from the center differential. Removing the brake pads made no difference. Using a stethoscope I couldn't hear anything from the rear differential. It can be described as a rapid cyclical whining/howling from the rear. Then the other day it also started making the same noise at 35 mph to 40 mph. The 2015 Subaru Forester has 713 problems & defects reported by Forester owners. But first second and third do not. Noise will carry through the drive line. Sounds to me like the rear differential is making the noise then. The noise is like a whine, sounds like it's coming from the back somewhere. 1 Answer. Recently I've been hearing a hum from the rear end. For the past few months, the brakes have been inconsistently making a dragging/grinding noise when coming to a stop at low speeds (<5mph). Have a noise in our Subaru Forester. What would cause the 2015 subaru forester fan noise? It's a manual transmission, 2004 model. ... Hi I have a 2005 Subaru Forester just out of the blue drive started slipping. The sound gets higher in pitch as speed increases. 1 Answer. Hi there Car Talk Community! Reply. '97 2.5GT, '06 STI 6spd, R160 with a Quaife diff (installed last year by Andrewtech). It’s been well-maintained and well-loved. 0 Views. 2015 Subaru Forester started loud noise from the back at 50 mph to 55 mph. Run it in AWD in the air and listen to the rear differential with a stethoscope. SOLVED!This was the center differential - aka transfer case. What would cause the 2015 subaru forester rear differential noise? Noise has been there a while, last time it was serviced our Subaru dealer basically told us to keep driving it until something goes wrong. It gets louder and increases in frequency as the car speeds up. Not quite a grinding noise but like the brakes were applied a little. $1100 to fix at Boxer Subaru Salem, MA (who did a good job). What would cause the 2015 subaru forester cabin fan noise? Usually happens under coast down (in gear or neutral) or very light throttle. I also noticed that when in gear all four tiers would spin but the left rear tire would spin much more slowly. Still drives great. Rear Differential Noise If a bearing is failing inside the differential the noise is virtually the same as the one created by a failing wheel bearing making it hard to isolate. 1 Answer. What would cause the 2015 subaru forester wind noise? Removing the rear seat made it louder, so it's definitely coming from the rear end. I have a 2006 Subaru Forester with 115K miles. Most noticable at about 60 mph in 5th gear. I am going to try changing tire pressures and then rotating tires to see if that has any affect. Specifically, when I’m doing approximately 40 mph on level smooth road I can hear changes in the pitch of the gear noise by alternating acceleration and taking foot off the gas. Just makes a rumbling noise.