What is the oil capacity of the transmission?

[freds]

With the removal of the center diff and housing. What is the new fluid capacity?

Anyone measured that yet? The manual says 3.7 Quarts but I believe that is the standard WRX spec.

I ask because my dipstick says full at about 2.5 Quarts and the chassis is level.

Do I have a dipstick problem?

[freds]

With the removal of the center diff and housing. What is the new fluid capacity?

Anyone measured that yet? The manual says 3.7 Quarts but I believe that is the standard WRX spec.

I ask because my dipstick says full at about 2.5 Quarts and the chassis is level.

Do I have a dipstick problem?

Help anyone

[Bob_n_Cincy]

Hi freds
If you look at the picture below, you only shorten the oil reservoir by a couple of inches. The removed metal from the rear diff is isn't much.
I think 1.2 quarts difference is a lot for the change. Just my best guess.
Look at the little x right above the front output shaft. Is that the dip stick?

Bob
21823

[RM1SepEx]

you don't reduce capacity at all, because of the parts removed... Should still take almost 4 qts... Sorry but I'm powder coating my end plate and lasering a graphic on it so I have not filled mine yet.

[Mechie3]

It could be due to a couple things:

1: The trans will almost never fully drain unless you've split the case and cleaned it out.
2: The oil is thick enough that if you pour it in, it won't always flow evenly. Turn the motor/transmission over several times and recheck it. It'll likely be lower.

[freds]

Thanks for the responses.
The case was split for LSD installation so that's not it.
As the engine and transmission are installed I cannot spin the transmission in gear, but my axles are not here yet so I could (and did) spin it in neutral using the output stubs.

I have the impression that the transmission appears to slope upwards to the rear of the chassis (may be an illusion). If true that might be causing the oil to "pool" towards the diff (and dip stick)

I would appreciate someone measuring the height (thickness) of the rear transmission mount and posting it. My transmission mount did not come from the donor and it may be a non stock unit that is tipping the assembly up.

Appreciate the help, as now is a really good time for me to make sure what's going on!

fred

[longislandwrx]

It could be due to a couple things:

1: The trans will almost never fully drain unless you've split the case and cleaned it out.
2: The oil is thick enough that if you pour it in, it won't always flow evenly. Turn the motor/transmission over several times and recheck it. It'll likely be lower.

especially cold... I always warm mine up before changing it. With a non running donor can't really do that.

I would just start with some cheaper gear oil to refill (I know you filled yours already) and once you are up and running and put a few miles on the trans, warm it up replace with some higher quality oil

a good flush is a smart way to start, and make sure you clean the magnet really well.

2.5 seems a little low, last time I changed mine it took over 3. And I certainly didn't split the case, so not sure why yours wouldn't take more. Then again I was running the car in neutral, so all the parts and passages were all being filled. I wouldn't worry about it too much until the engine is running.

[freds]

This probably accounts for some reduction in oil volume.

2185121852

[metalmaker12]

4 qts, you just have to spin it up with a couple starts than re check

[tmoretta]

I also have split my trans. case to install an LSD. Did you have any problem with adjusting pinion gear lash afterwards? Any hints?

[Samiam1017]

I would like to see a detailed build thread on an LSD install. I've never messed around with transmissions and wouldn't know what to look for when doing my LSD swap

[freds]

I would like to see a detailed build thread on an LSD install. I've never messed around with transmissions and wouldn't know what to look for when doing my LSD swap

tmoretta
I also have split my trans. case to install an LSD. Did you have any problem with adjusting pinion gear lash afterwards? Any hints? No as long as the pinion and its shaft assembly have not been altered!


I too didn't have any experience so:

1. I searched for info about LSD's especially on NASIOC and found tons of information...also some Honda sites....and found enough info to make me feel comfortable taking chance on an OBX.

2. I took the OBX apart and cleaned up the "rough edges" etc...again lots of info if you search.

3. A local Aamco transmission shop were prepared to have me with them when opening the transmission. So actually they did the installation with my "help".

4. Since the pinion shaft was not dismantled in any way and only the ring gear carrier/differential was removed and replaced by the OBX....when reassembling it was only necessary to adjust the position of the diff by adjusting the two external adjusting bearing locators/oil seal carriers.

I'm glad I didn't have a go myself, as the tech was much more "forceful" removing bolts and splitting the box than I would have been. He was no more forceful than necessary!...I would have been struggling to get the box apart. Even the shift linkage assembly was almost "welded" to the shaft by the salt from wherever my donor came from.

5. The actual moving of t he ring gear to the PBX and buttoning it up again was "easy" and no fancy tooth meshing checking was necessary or done (because the pinion had not been "messed with" at all).

I wouldn't be nervous next time...having "served my apprenticeship"
now.

[tmoretta]

After installing my OBX limited slip diff., buttoning up and adjusting trans. gear lash, I installed drivetrain in my 818S. When attempting to install the 3.7 quarts of lube specified by FFR, the dipstick tube overflowed at less than 3.5 quarts. What's up? The car frame is level and the dipstick shows way high.

[Harley818]

did anyone come up with a final resolution on this?
I'll be getting to the tranny soon and it would be good to know what to expect. Sounds like multiple people are at full before the expected volume is installed.
Could be because of residual oil, or because of additional volume of the LSD?

[JeromeS13]

Install 3.7 quarts. Period. Your dipstick is incorrect, since the transmission is now at a slight angle.