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Old 04-19-2012, 08:03 PM   #1
wongsubi
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Default MT fluid change on ramps?

Just a simple question....

Would I be able to do the MT fluid drain with my car going on ramps or does it have to be on 4 jack stands and level to the ground? Has anyone here done it on ramps? How well does it drain?
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Old 04-19-2012, 08:20 PM   #2
424wrx
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i did mine with ramps. it drained just fine. from what i recall, the drainplug is centered at the bottom soo a tilted car wouldnt matter much. the rear diff was a little harder on ramps. its also a pita to refill. i used a tube attatched to the quart bottle and squeezed it in. im sure there are better ways though.
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Old 04-19-2012, 08:40 PM   #3
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Originally Posted by 424wrx View Post
i did mine with ramps. it drained just fine. from what i recall, the drainplug is centered at the bottom soo a tilted car wouldnt matter much. the rear diff was a little harder on ramps. its also a pita to refill. i used a tube attatched to the quart bottle and squeezed it in. im sure there are better ways though.
Awesome, thanks for the info. I plan to do my MT fluid and rear diff tomorrow. For the rear differential, can you do it with the car on the ground flat? or does it have to be tilted on ramps or elevated? I plan to use one of those plastic syringes with a rubber bulb at the end for filling.
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Old 04-19-2012, 09:26 PM   #4
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The drain plug for the rear chamber on the MT faces the front of the car (at least on mine) so I pull my car up on my ramps and then level it by using a jack on the rear diff. While you have your car up on the jack you can put your jack stands under the car and then drain the rear diff.
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Old 04-19-2012, 09:35 PM   #5
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Quote:
Originally Posted by wongsubi View Post
Awesome, thanks for the info. I plan to do my MT fluid and rear diff tomorrow. For the rear differential, can you do it with the car on the ground flat? or does it have to be tilted on ramps or elevated? I plan to use one of those plastic syringes with a rubber bulb at the end for filling.
The car needs to be on level ground while filling the differential.
You need a suction gun to make filling easy.
http://shop.advanceautoparts.com/web...T|GRP2082_____
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Old 04-19-2012, 10:11 PM   #6
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Quote:
Originally Posted by ogintheback View Post
The drain plug for the rear chamber on the MT faces the front of the car (at least on mine) so I pull my car up on my ramps and then level it by using a jack on the rear diff. While you have your car up on the jack you can put your jack stands under the car and then drain the rear diff.
So the MT fluid won't drain properly if I just put the car on ramps?
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Old 04-19-2012, 10:12 PM   #7
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Quote:
Originally Posted by mikeythejew View Post
The car needs to be on level ground while filling the differential.
You need a suction gun to make filling easy.
http://shop.advanceautoparts.com/web...T|GRP2082_____
Gotcha, thanks.
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Old 04-19-2012, 10:28 PM   #8
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Originally Posted by wongsubi View Post
So the MT fluid won't drain properly if I just put the car on ramps?
No, more will drain out once you have leveled your car.

Here look at the picture showing the drain plug - oil pan side. The plug faces the front of the car, therefore the opposite side faces the rear of the car. If you only have the front of your car up on ramps (omitting jacking up the rear of the car) some fluid will be trapped in the back of that chamber. If this picture doesn't clear it up, once you get your car up on ramps, you'll see.

http://www.iwsti.com/forums/how-inst...trans-oil.html


Doing mine tomorrow pm as well.
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Old 04-19-2012, 11:37 PM   #9
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So I did mine today and purposely stopped my car on a slight ramp with the rear being a little higher. Everything went fine except for taking off the diff drain plug... god damn that thing is on tight, there is no need for that plug to be tightened so much. Anyways I didn't have a fuel suction gun so I went to the supermarket and bought a cooking baster... well that didn't work because the LSD oil is so viscous it barely squeezed any out. So I thought I use gravity instead....

If anyone out there is having problem filling the rear diff you can try this... probably have been done already but just in case someone out there needs to do this and doesn't have an oil suction gun or whatever... you can use this method, it actually works faster.

All you need is some plastic tubing from home depot and a funnel.









Just make sure you cut the plastic tubing long enough so you can stand up and hold it high, the higher you can hold it the better and the more potential energy gravity has to pull the oil into the rear diff. Also you don't want the tubing to be too long obviously, you want it just long enough and nice and taught so it minimizes the residual oil left over in the tubing. The gear oil is quite viscous so it will take awhile to fill up 1 liter, but it's still faster than using a suction/syphon. After you get all the oil in, make a fist around the tubing and blow in it to get some of the residual oil into the diff.

The trans fluid can also be filled using the tubing and that's what I used. I've seen and read somewhere that people actually remove the intercooler just to get to the transmission fill hole, there is absolutely no need to do that, unless you want to do extra work??

Last edited by wongsubi; 04-20-2012 at 06:06 PM.
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Old 04-20-2012, 05:13 PM   #10
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I forgot to mention I broke my fill hole sensor plug (the plastic part) during the removal, I was still able to plug the probe back but it's not secure at all. I was wondering if the car will run fine without the sensor plugged in....? I'm assuming I'll probably get a rear diff light/CEL light if that happens to fall off or come loose? I called up the local subaru parts, and they said a new fill plug with the sensor plug-in costs somewhere at $145. I'm not going to pay 145 for a freaking bolt....

Does anyone know if you can drive without the sensor being plugged in or will this be a problem? Is the sensor just a temp sensor or does it actually have any other function?

Replies and feedback appreciated.
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Old 04-20-2012, 06:06 PM   #11
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the DCCD uses the input from that sensor as one of the parameters for controlling the DCCD... you may be out of luck.
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Old 04-20-2012, 06:11 PM   #12
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Originally Posted by z View Post
the DCCD uses the input from that sensor as one of the parameters for controlling the DCCD... you may be out of luck.
Wtf... I can't imagine that sensor sensing anything but temperature... so the DCCD won't work properly on auto without the sensor? What if I manually set the DCCD?
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Old 04-20-2012, 06:31 PM   #13
z
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Right, and it uses that temperature reading to make sure the rear diff temp doesn't get too hot.... if the temp in the rear diff gets too hot, it will adjust the dccd based on that. But it will cause an issue if there is no input from that sensor. I'm not sure if it will just default to open or what though.

Last edited by z; 04-20-2012 at 06:47 PM.
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Old 04-20-2012, 06:45 PM   #14
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just read this in the FSM:

Quote:
Originally Posted by factory service manual
Moreover, the rear differential oil temperature switch opens when the rear differential oil temperature
exceeds 150 C (302 F) causing the rear differential oil temperature warning light in the combination
meter to turn on and switch the center differential in the transmission toward differential lock
operation.
and

Quote:
Originally Posted by factory service manual
! Rear differential oil control
When the rear differential oil temperature rises and the oil temperature switch activates, the center
differential restriction torque is controlled toward the free state.
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Old 04-20-2012, 06:48 PM   #15
wongsubi
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Quote:
Originally Posted by z View Post
Right, and it uses that temperature reading to make sure the rear diff temp doesn't get too hot.... if the temp in the rear diff gets too hot, it will adjust the center diff to more lock. But it will cause an issue if there is no input from that sensor. I'm not sure if it will just default to open or what though.
I see. Thanks for clearing that up. Free state = DCCD fully open?
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Old 04-20-2012, 07:43 PM   #16
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Quote:
Originally Posted by wongsubi View Post
I see. Thanks for clearing that up. Free state = DCCD fully open?
Yes, meaning 65 rear/35 front
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