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Discussion Starter · #1 ·
I have a 2010 forester with a manual transmission. It has a really bad clunk or jump in the suspension when you turn in a parking lot or a parking space, either direction and in forward and reverse. I thought it was a CV joint so I changed both axles and both front wheel bearings since I was in there. This solved nothing. This is a similar clunking like a posi-traction reared with new clutches but is more violent in the front. This happens after the transmission is warmed up either by driving 5 miles or leaving it idle for 15 minutes. It is fine on a cold engine/transmission. It also developed a whizzing sound from the transmission or drive train after warm-up, noticed on de-acceleration. The sound is like the gears are meshing, just bad, just enough so you can hear and feel it. I also drained and changed the transmission/front differential fluid. None of this solve the issue. What could it be? Any advice?
 

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Discussion Starter · #3 ·
Wisconsin-USA
Owned Ruby for less than a year, bought it at a new car dealer off the used lot.
No metal, fluid actually looked clear/clean. (Okay, that was a signal to me, something might have been up, that was why the trade in).
Drive shaft is good and tight.
Engine and transmission mounts are sound.
Heat shields are good.
Clutch is operating as it should.
Shifts good except it began to not mesh going from 4th to 5th without the clutch...synchro issue or not use to it, just not enough driving by me. It is my GF's vehicle.

I did find a string on here where a gentleman has the same issue on a 2003. His name is Nicholas Stafford and posted on 05/16/2019.
His diagnosis is it is the CENTER DIFFERENTIAL ASSEMBLY and has a link to the part for his vehicle. I'm going to go that route and change it!
 

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Discussion Starter · #7 ·
Hey now......I don't "murder" the synchros. It is my girlfriends vehicle, this was probably the 5th time I drove the vehicle after we bought it.
Any manual transmission with synchros can be driven w/o depressing the clutch if you gingerly up-shift (or even down shift) if you don't have a heavy load on the gears, if you have ever driven a large truck like a semi tractor or a dump truck you would know how it's done. Clutches are for starting out and stopping, unless you slam the gears.
Every manual transmission I have had I have driven, on occasion, like this. It is a good way to check the synchros. It worked perfect when cold but after about 10 miles, and the transmission was warned up, it didn't just drop in on the first attempt this one time I tried it....it might have been my unfamiliarity with driving the vehicle.

So what am I going to do? After research, lots and lots of research, I have decided to have the Center Differential Assembly changed. I will update the Forum after the job is complete.
 
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