Trans(2 drain plugs) and Rear Diff Fluid Change

vaughn · 10-25-2004, 06:54 PM

ADMIN EDIT: Scroll down to see official Subaru documents and the IWS discussion pertaining to the two drain plugs.

Got the fluids to do my own transmission and rear diff change.

Just wondered if there was any additional parts I would need from the dealer like crush washers such as the engine drain plug has?

Also, are there 2 drain plugs for the tranny? A quick look underside and I saw one drain plug. Where is the second one?

Thanks...

bikerboy · 10-26-2004, 06:13 AM

No aditional parts needed.

Two plugs: one on the little pan on the bottom of the tranny. The other is twards the front o fthe car on the center diff housing. When your under there you cant miss it.

BB

mcR · 10-26-2004, 06:37 AM

Quote:

Originally Posted by bikerboy

No aditional parts needed.

Two plugs: one on the little pan on the bottom of the tranny. The other is twards the front o fthe car on the center diff housing. When your under there you cant miss it.

BB

awww darn.... i only saw one plug when i did mine.. think i should drain it again?

chrisfx811 · 10-26-2004, 07:43 AM

1st time i drained my tranny fluid i used both plugs and 4.5 qts came out.
2nd time i used just the one plug (i couldn't find larger socket for the other)
and 4.5 qts came out.
go figure

***staticx313*** · 10-26-2004, 08:02 AM

mcR - I would just make sure you didn't overfill it, however you may have just gotten a mix of dino and synthetic oil (if you put synthetic in), since it may not have all drained out ... heres a pic.

Robert~

vaughn · 10-26-2004, 06:44 PM

Thanks for the response. The picture says it all - outstanding.

***MKIVSupra*** · 10-28-2004, 09:38 AM

Yeah it does. In fact, I am going to make this a sticky because if I did not read about 2 drain holes in a previous post, I would not have know about it.

mcR · 10-28-2004, 01:26 PM

Quote:

Originally Posted by staticx313

mcR - I would just make sure you didn't overfill it, however you may have just gotten a mix of dino and synthetic oil (if you put synthetic in), since it may not have all drained out ... heres a pic.

Robert~

i didn't use synthetic.. i thought i was bad for our cars

***staticx313*** · 10-30-2004, 12:50 PM

Royal Purple worked great, Redline did not, probably staying with dino is the best in the end though.

Robert~

Antimullet · 11-10-2004, 03:13 PM

You have to drain both to do it properly.

If you just drained one and got the same amount of oil out as draining both then you must have drained the lowest one, but I still don't see how that is possible.

Think about it as draining the oil and particulates out of the motor side and the center diff (clutch) side. You want to get the old oil and the microscopic contaminates fully out of the system right? Otherwise you'd never need to change oil. If you just drain one your just gonna mix old metallic particulates from either the engine, or the organic crap from the clutch into your new oil. So your robbing peter to pay paul in a sense. In other words do both or don't waste your time. Its kinda like changing oil without changing the oil filter. A complete waste of time.

samus · 11-13-2004, 10:31 AM

how much gear oil goes into the sti tranny? and rear diff?

***MKIVSupra*** · 11-13-2004, 12:35 PM

A little over 1qt in the diff and I got just about 4.3qt in the trans to put it at the F mark.

TL-racer/STi-driver · 01-10-2005, 11:06 AM

Does anyone have these same type of instructions for the rear differential. Or does anyone have the torque specs for the top and bottom plugs. How much does the dealer charge for the tranny and rear diff fluid change? Thanks in advance.

taliano95 · 01-25-2005, 07:35 AM

How often would i have to do this, if i even have to do it at all? I thought in manual transmissions, you didnt have to change the oil, or something like that. I never changed any trans oil in my VW. I dont know much about trannys, so sorry in advance if this is a dumb question.

TL-racer/STi-driver · 01-29-2005, 04:24 AM

Can anyone post the same type of instructions for the rear diff fluid change. How doy you take the temp sensor off to get the full plug out without breaking the sensor? Is the stock fluid Valvoline Gear Oil 75W-90 dino? I was thinking of getting the Valvoline High Performance Gear Oil and sticking with the dino oil so it doesn't mess with the limited slip like some people are having problems with. Thanks for any help you can give.

10-25-2004, 06:54 PM	#1
vaughn Amateur STI Driver Car: Motorcycles, Mountain Biking Fav Mod: Engineer Location: Colorado Springs Posts: 13 Join Date: Aug 2004 Trader Rating: (0)	Trans(2 drain plugs) and Rear Diff Fluid Change ADMIN EDIT: Scroll down to see official Subaru documents and the IWS discussion pertaining to the two drain plugs. Got the fluids to do my own transmission and rear diff change. Just wondered if there was any additional parts I would need from the dealer like crush washers such as the engine drain plug has? Also, are there 2 drain plugs for the tranny? A quick look underside and I saw one drain plug. Where is the second one? Thanks... This ad is not endorsed by this member. Please register or login to hide this ad. Last edited by Nivek : 04-02-2005 at 12:46 AM.

01-29-2005, 04:24 AM	#15
TL-racer/STi-driver STI Driver Posts: 286 Join Date: Jan 2003 Trader Rating: (1)	Can anyone post the same type of instructions for the rear diff fluid change. How doy you take the temp sensor off to get the full plug out without breaking the sensor? Is the stock fluid Valvoline Gear Oil 75W-90 dino? I was thinking of getting the Valvoline High Performance Gear Oil and sticking with the dino oil so it doesn't mess with the limited slip like some people are having problems with. Thanks for any help you can give. This ad is not endorsed by this member. Please register or login to hide this ad.

10-26-2004, 06:13 AM	#2
bikerboy Amateur STI Driver Posts: 14 Join Date: Mar 2004 Trader Rating: (0)	No aditional parts needed. Two plugs: one on the little pan on the bottom of the tranny. The other is twards the front o fthe car on the center diff housing. When your under there you cant miss it. BB

10-26-2004, 07:43 AM	#4
chrisfx811 The Next Petter Solberg Location: louisville, ky Posts: 936 Join Date: Sep 2003 Trader Rating: (0)	1st time i drained my tranny fluid i used both plugs and 4.5 qts came out. 2nd time i used just the one plug (i couldn't find larger socket for the other) and 4.5 qts came out. go figure

10-26-2004, 08:02 AM	#5
*staticx313* Platinum Member Car: 05 Subaru WRX STI CG Fav Mod: 3" FP20G - 403WHP/417WTQ Location: Huntsville, AL Posts: 5,279 Join Date: Aug 2003 Trader Rating: (2)	mcR - I would just make sure you didn't overfill it, however you may have just gotten a mix of dino and synthetic oil (if you put synthetic in), since it may not have all drained out ... heres a pic. Robert~

10-26-2004, 06:44 PM	#6
vaughn Amateur STI Driver Car: Motorcycles, Mountain Biking Fav Mod: Engineer Location: Colorado Springs Posts: 13 Join Date: Aug 2004 Trader Rating: (0)	Thanks for the response. The picture says it all - outstanding.

10-28-2004, 09:38 AM	#7
*MKIVSupra* Moderator Elite Car: 04 Subaru WRX STi, W Fav Mod: KartBoy SS & Bushings Location: Illinois Posts: 8,744 Join Date: Jan 2001 Trader Rating: (0)	Yeah it does. In fact, I am going to make this a sticky because if I did not read about 2 drain holes in a previous post, I would not have know about it.

10-30-2004, 12:50 PM	#9
*staticx313* Platinum Member Car: 05 Subaru WRX STI CG Fav Mod: 3" FP20G - 403WHP/417WTQ Location: Huntsville, AL Posts: 5,279 Join Date: Aug 2003 Trader Rating: (2)	Royal Purple worked great, Redline did not, probably staying with dino is the best in the end though. Robert~

11-10-2004, 03:13 PM	#10
Antimullet Professional STI Driver Car: 2005 STi Fav Mod: Big Turbo Location: NORCAL Posts: 471 Join Date: Jan 2004 Trader Rating: (0)	You have to drain both to do it properly. If you just drained one and got the same amount of oil out as draining both then you must have drained the lowest one, but I still don't see how that is possible. Think about it as draining the oil and particulates out of the motor side and the center diff (clutch) side. You want to get the old oil and the microscopic contaminates fully out of the system right? Otherwise you'd never need to change oil. If you just drain one your just gonna mix old metallic particulates from either the engine, or the organic crap from the clutch into your new oil. So your robbing peter to pay paul in a sense. In other words do both or don't waste your time. Its kinda like changing oil without changing the oil filter. A complete waste of time.

11-13-2004, 10:31 AM	#11
samus Lurker Car: Silver 05 GT35rd STi Posts: 6 Join Date: Nov 2004 Trader Rating: (0)	how much gear oil goes into the sti tranny? and rear diff?

11-13-2004, 12:35 PM	#12
*MKIVSupra* Moderator Elite Car: 04 Subaru WRX STi, W Fav Mod: KartBoy SS & Bushings Location: Illinois Posts: 8,744 Join Date: Jan 2001 Trader Rating: (0)	A little over 1qt in the diff and I got just about 4.3qt in the trans to put it at the F mark.

01-10-2005, 11:06 AM	#13
TL-racer/STi-driver STI Driver Posts: 286 Join Date: Jan 2003 Trader Rating: (1)	Does anyone have these same type of instructions for the rear differential. Or does anyone have the torque specs for the top and bottom plugs. How much does the dealer charge for the tranny and rear diff fluid change? Thanks in advance.

01-25-2005, 07:35 AM	#14
taliano95 The Next Fernando Alonso Car: 2005 subaru wrx sti Fav Mod: TEIN SS COILOVERS Location: Northern New Jersey Posts: 364 Join Date: Aug 2004 Trader Rating: (1)	How often would i have to do this, if i even have to do it at all? I thought in manual transmissions, you didnt have to change the oil, or something like that. I never changed any trans oil in my VW. I dont know much about trannys, so sorry in advance if this is a dumb question.