[Gami004pilot]

Hi guys!
I gotta big question and a big concern.
I just changed my fluid in the tranny (front) and (rear) with Amsoil 75-90 @ 40k.

I noticed after coming back form the dealer after the fill that the transmission feels different in a not so good way. When I go around my parking lot at my apartment complex in first gear around corners, especially when parking, my car jerks like if it were stalling. I parked the car over night and checked the dip stick the next morining and the transmission dip stick was a little low.
I topped the tranny fluid off but I still get this gerky/stall feeling in first gear around corners.
Has anyone every experianced these symptoms before or know what it is?
Did I put the right fluid in in the front and rear? Cna this cause damage?

Thanks in advance.

[supermarkus]

rear diff doesn't get 75-90, it's just straight 90 weight gear oil back there. Some STIs are picky about what you put in the rear diff, only behaving nicely with the OEM fluid, some have been fine with synthetic. Can you feel which diffs are binding up, because it sounds like your diffs are locking up mid turn. Is your DCCD set to auto or full open?

[Gami004pilot]

Auto. the car jerks like if I left the DCCD off the auto position and the car is coming to a stop while turning.
Any suggestions?

[eXstasy]

Since you already checked your tranny fluid level and it is fine, I'd go with what supermarkus said... you may want to pick up 1 liter of genuine Subaru 90 weight LSD oil. It sounds like your car doesn't like the Amsoil in the rear diff.

https://www.subarugenuineparts.com/p...oducts_id=1063

[Gami004pilot]

So you suggest that only the rear diff fluid gets replaced?

[Gami004pilot]

Hi again guys.
Well, I went to my Subie dealer early in the moring this Saturday for my weird jerky feeling and my tech wasn't there so the second tech checked it out to see if all fluid levels were top off but of course he checks it hot.
He said it might be the fluid being to high and I mentioned to him saying " don't you check it when its cold?" he stood quiet.
He took it for a drive and said it feels like the DCCD is off & in manual when its on Auto mode. He mentioned that it feels like the center diff is binding up.
So I came outta the dealership with no fix because they want me to come in threw the week when my main mechanic is there to check it out.
Its really weird. It only happens in reverse and in 1st gear slowly turning.
I would hate to have to rechange the fluid. I always heard amazing things about Amsoil fluids but I think it might be hurting my Subie.
I have the 75-90w and it's GL-5 front transmission and rear diff.
What do you guys suggest. I'm worried about my car and I not to sure what to do.

[Inertia]

As we discussed in the other thread you need to start narrowing things down. I can think of a few culprits here you need to start eliminating:
- electrical, possibly (not sure how) something got unplugged or dammaged in the fluid changing process affectind your dccd negatively. Play with your dccd settings to make sure its working properly and see if that helps at all.
- mechanical, not sure how any difs woul have got dammaged in fluid change so this is highly unlikely
- impropper fluid level, not sure how this either but if levels are ok in the front AND the back as I cant tell from your post if he just checked the front or the rear diff also you need to open the top plug in that rear dif to make sure its full, top off if necessary.
- finally if nothing else helps you need to change the front or rear and replace with a different fluid, motul, suby, whatever just something different and still compatable. Do the rear first as you will find out if its full while your at it. If that doestn fix it move to the front.

[Inertia]

Oh and to avoid problems you may have to be willing to do the fluids yourself. If the dealership did the fluid changes for you it seems plausable that they screwed up somehow.

[fullerton]

does this only happen during tight turns?

[Gami004pilot]

Inertia I really appreciate the help and info.
When I went to the dealership and he drove in the car, he didn't let the car sit to cool down. When screwed off the top plug off the rear diff we both noticed that some fluid came out like it was over filled but not much.
Then he brought down the car from the lift and then took it for a test drive.

I'm gonna go and put the subie on a level surface and re-check all the levels. How long should I wait to it cools off?
I don't see how it can be the fluids causing this binding feeling after a fluid change.
That same day they changed the fluid they also change the mid cat on the exhaust system (That was the primary reason of the service that day). Could they have knocked a DCCD wire loose?

[Gami004pilot]

Originally Posted by fullerton

does this only happen during tight turns?

Some what. I'm gonna have to say yes.
Because when I go in reverse (straight back, no turning) it does it as well. When going foward it does it in tight turning only at slow speeds like going into your driveway.

Why you ask?

[fullerton]

I have a jerkyness that will happen on tight (90°) turns at medium speeds while accelerating. I changed from Valvoline 75w90 to Amsoul SVG 75w90 in the rear diff and it still happens.

I am running a ****tail of Valvoline 75w90, GM Syncromesh and Redline Lightweight Shockproof in the tranny/front/center diff.

The jerkyness seems to go away if I give it more power. Doesn't happen on long turns, or when I am giving it little power. Or reverse. Or during tight turns on the driveway.

[Inertia]

^ our cars do bind a little under certain circumstances. I have all motul fluids and sometimes notice wierd behaviour in reverse or tight turns when its cold but nothing that makes me worried. This car does really have quite agressive diffs for a street car. However I think the OPs issue seems more dramatic and seemed to start all at of a sudden after recent service.

Set your dccd to full open and conversly full lock see if it makes any difference. That should give us some idea whats going on with your center diff.

Oh and don't be son concerned with fluid temps. They do expand and such but not enough I think to throw off measurements so significantly that it would cause your current problems.

[Gami004pilot]

Thanks for the replies guys I trully appreciate the help.

Okey! I went for a spinn around my apartment complex at the 10mph speed limit with some speed bumps here and there.
I noticed that putting the DCCD on lock it has less jerkyness and goes around smoothly. When going in any other setting whith the DCCD I can hear the rear tires moving slower depending in what direction im turning the car in and has less bucking (EX: right turn, right tire moves slower or sounds like it's draging on the floor slowly).
When the DCCD is on auto and I turn the steering wheel fully right or left to go in a complete circle, the car starts bucking but not alot, It feels just like the car wants to stall and when stalling it makes clicking /jerking noises whlie bucking.
If I give the car some gas and go faster it tends to go away.
Before the fluid change it never did this and would smoothly go in a complete circle but now it like a bucking bronco.
Is there any wires I should check under there since they changed the mid cat on the exhaust.

[Inertia]

yikes ok stop driving the car now please. I don't want to be responsible for you destroying differentials