Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
legacy center differential
Posted 03 August 2003 - 07:40 PM
Posted 04 August 2003 - 08:51 AM
Auto trans use a hydraulic clutch to send power to the rear wheels, on demand, and in my opinion this isn't really a differential. I don't know for sure, but expect the clutch system is also integral with the transmission. How would that start to whine?
Basically, a pain to get to, cause you need to take the gearbox out, which means that front drive axles and exhaust have to come off too...
Is it manual or auto? Does the noise disappear when coasting in neutral, or only when stationary? Clutch engaged or disengaged?
There are plenty of bearings in the system that can start whining, but you need to be sure of where its coming from.
Posted 04 August 2003 - 09:22 AM
I dont know about auto trans but I would suspect it's also an independent unit.
Just an idea : since the speedo stopped to work at about the same time, could the noise come from where the speedo cable connects to the trans ?
Posted 04 August 2003 - 02:54 PM
Posted 05 August 2003 - 07:46 AM
Posted 05 August 2003 - 07:55 AM
Posted 05 August 2003 - 08:32 AM
I would also want to know it the noise is present in all the shift lever positions i.e.: 1st, 2nd etc. when you start from a stop.
You say it's gone in neutral, how about when down shifting from D to the lower gears, is it different?
Also is it in reverse too?
Also noise at all speeds or does it start after a specific speed say 10MPH or higher?
It's hard to diagnose a problem without being there. The more info we get the more we can guess some possible causes of the sound.
Posted 05 August 2003 - 09:26 AM
Posted 05 August 2003 - 02:03 PM
FRAG: The viscous diff on my manual 4WD is inside the main transmission casing. I know, I have replaced the main bearings
Posted 05 August 2003 - 02:28 PM
And is it clear we are talking about the center diff and not the front diff.
Posted 05 August 2003 - 11:52 PM
Yes, I do mean the central diff
Glad to hear that they had the sense to move it out of the main casing on later models.
Posted 05 August 2003 - 11:58 PM
Posted 06 August 2003 - 06:28 AM
I think some of the confusion is coming from various people's definition of what's considered "inside" or not.
Posted 06 August 2003 - 09:32 AM
Posted 06 August 2003 - 11:51 AM
Posted 06 August 2003 - 01:13 PM
Am I right in tinking that if you unbolted this rear portion (rather short compared to the rest of the trans) the entire viscous coupling would then be removed, and the trans itself would still be operationnal (FWD) if you found a way to keep the trans oil inside. Moreover, if you removed this rear portion (having it's own case) and replaced it with a new one, the result would be a trans with a new viscoup coupling.
At leas that's the way i've always understood the mechanical relation between the coupling and the trans.
Please correct me if i'm wrong.
Posted 28 October 2009 - 04:12 PM
Posted 28 October 2009 - 07:55 PM
An open diff means there is no resistance from one side to the other. One wheel can spin freely while the other hardly moves or sits completely still.
With a limited slip diff the action of the diff will be different based on which type of LSD it is. Viscous, clutch type, helical gear type, etc. But the basic gist is that when one wheel spins the other wheel will spin with it, but there is still some room for independent slip so the car can go around corners without binding.
Posted 29 October 2009 - 06:35 AM
I have a 1990 Subaru Legacy that appears to have some center differential issues. It is an AWD model, but when both front wheels OR both rear wheels are on a low-traction surface, one of the wheels on that axle spins and torque is not shifted to the other axle. In other words, both axles get torque at different times, but no shifting of torque between axles happens when it is supposed to.
Manual or auto?
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users