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Old 03-06-2008, 06:00 PM   #1
SC2000
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Default Just changed tranny fluid- harder to downshift now?

My car currently has about 30,900 miles on it and I replaced the trans fluid with non synthetic Valvoline 75W-90. I drove it around and thought everything was great, but it didn't seem to shift any easier or differently than before I changed the fluid. But after driving for a couple days now, I've noticed that when I come to a stop, it's harder to downshift into 2nd gear. Before I wouldn't really get into 1st gear until I almost came to a stop. It's the same now, but it seems as though 2nd gear is just as difficult to down-shift into. Also, the upshifts are fine. I can go from 1st-2nd-3rd-etc.. just fine. Only downshifting I noticed it got more difficult.

Thinking of changing the fluid out again and going with Motul 300 (synthetic).
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Old 03-06-2008, 06:50 PM   #2
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I think its recommended to use the tranny fluid from subie dealers.
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Old 03-06-2008, 07:24 PM   #3
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Everyone thinks synthetic oils are more slippery. If that was true, you wouldn't want it in your transmission.

If any gear oil, dino or synthetic, says it's approved to use in limited slip diffs, the fluid will be slippery which will cause harder shifting/grinding in a synchronized transmission.

I can shift into 1st rolling at 20mph using a specific GL-5 75W90 gear oil that I've talked about before. A few have tried it out and like the stuff, one reporting it in a reply somewhere on this site.
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Old 03-06-2008, 07:51 PM   #4
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Quote:
Originally Posted by mikeythejew View Post
Everyone thinks synthetic oils are more slippery. If that was true, you wouldn't want it in your transmission.

If any gear oil, dino or synthetic, says it's approved to use in limited slip diffs, the fluid will be slippery which will cause harder shifting/grinding in a synchronized transmission.

I can shift into 1st rolling at 20mph using a specific GL-5 75W90 gear oil that I've talked about before. A few have tried it out and like the stuff, one reporting it in a reply somewhere on this site.

which fluid are you referring to?


I've read that the dino Valvoline 75W-90 Gear Oil was the stuff to get. Not sure what to try now.
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Old 03-06-2008, 08:55 PM   #5
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Redline lightweight shockproof.
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Old 03-07-2008, 12:54 AM   #6
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Quote:
Originally Posted by SC2000 View Post
which fluid are you referring to?

nevermind...did a search with your user name. seems like you like the supertech semi syn gear oil...i'lll check out my local wal-mart and see if they got anything in stock. i can't stand driving this thing on local roads...pita going into 1st AND 2nd.
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Old 03-07-2008, 12:57 AM   #7
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Quote:
Originally Posted by RingU View Post
I think its recommended to use the tranny fluid from subie dealers.

If only they didn't sell it in a 20 Liter bucket and not cost me $150, I'd consider it. They should sell these by the liter...someone contact SOA.
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Old 03-07-2008, 04:43 PM   #8
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Thats odd. Lots of people very happy with the valvoline dino.

My car has had it in for about 15k now and it still shifts like it did when I put it in.
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Old 03-07-2008, 08:29 PM   #9
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Use the redline shockproof lightweight. A bit expensive but works great.
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Old 03-07-2008, 10:15 PM   #10
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http://www.wd-wpp.com/specsheet/75w90.pdf This fluid is sold at walmart @ $4.12 a quart as SuperTech semi synthetic 75W90 in grayish bottles. Our tranny doesn't have a clutch type LSD to need a friction modifier, thats why the link says it's for top off only. I have used this fluid over 20k and it works. The viscosity index is high which means this fluid has a very good oil base.

It's the diamond in the rough.
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Old 03-07-2008, 10:22 PM   #11
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The supertech bottle says it provides excellent protection for copper and other yellow metals or something.
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Old 03-08-2008, 12:59 AM   #12
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I'm surprised as well that you're having downshifting issues as, after exhaustive testing of most of the other blends out there, I've settled on the Valvoline dino because of the shift performance.
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Old 03-08-2008, 08:24 AM   #13
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I ran Motul Gear 300 for quite a while - shifted just fine (standard resistance to getting into 1st while above 5-10mph without rev matching, but everything else was smooth)
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Old 03-08-2008, 12:13 PM   #14
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i have found that both of my cars hated the valvoline 75w90
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Old 03-08-2008, 12:22 PM   #15
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Quote:
Originally Posted by Arctic Penguin View Post
i have found that both of my cars hated the valvoline 75w90
The dino or the synth? All of them hate the synth, most of them like the dino.
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Old 03-08-2008, 12:44 PM   #16
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My car did not like the Valvoline 75w-90 dino at all. So weird the varying experiences on these forums.
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Old 03-08-2008, 01:21 PM   #17
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Quote:
Originally Posted by Mind View Post
My car did not like the Valvoline 75w-90 dino at all. So weird the varying experiences on these forums.
what did you end up using?
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Old 03-08-2008, 01:52 PM   #18
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Amsoil 75w90 SVG... tranny isn't liking that too much either. I don't mind notchiness that much (kind of like it), but the shifter is very scratchy going in/out of gears.
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Old 03-08-2008, 05:01 PM   #19
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draim some fluid and add a quart of royal purple synchromax or penzoil synchromesh in there
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Old 03-08-2008, 05:07 PM   #20
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While that will work very well, people need to know both of those fluids dissolve the synchros over time.
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Old 03-09-2008, 12:13 AM   #21
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Quote:
Originally Posted by williaty View Post
While that will work very well, people need to know both of those fluids dissolve the synchros over time.
i would like to see proof of this statement

or you should delete it
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Old 03-09-2008, 12:47 AM   #22
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Well, first of all, you can look at the fact that the data sheets for both of those products contain chemicals known to be corrosive to "yellow" metals. Then you can go ahead and look at the fact that neither of those lubes can be GL-5 certified due to the amount of un-encapsulated Sulfur in them (which is corrosive to brass). Then you can talk to a couple of the big name Subie tranny shops (or just read their posts on here about this topic) where they report that the majority of the transmissions they rebuild where Synchromesh/max had been run have severe pitting of the synchros.

If you don't want to believe me or them, that's your choice. However, people have the right to make an informed decision. They can either believe me, disbelieve me, or become interested enough to go find data one way or the other themselves.

Deal with it.
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Old 03-09-2008, 06:27 AM   #23
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Quote:
Originally Posted by Arctic Penguin View Post
i would like to see proof of this statement

or you should delete it
hypoid gear oils, (gear oils designed specifically for differentials) have substances in them that are corrosive to metal alloys containing copper in them like synchros
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Old 03-09-2008, 06:28 AM   #24
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Quote:
Originally Posted by williaty View Post
Well, first of all, you can look at the fact that the data sheets for both of those products contain chemicals known to be corrosive to "yellow" metals. Then you can go ahead and look at the fact that neither of those lubes can be GL-5 certified due to the amount of un-encapsulated Sulfur in them (which is corrosive to brass). Then you can talk to a couple of the big name Subie tranny shops (or just read their posts on here about this topic) where they report that the majority of the transmissions they rebuild where Synchromesh/max had been run have severe pitting of the synchros.

If you don't want to believe me or them, that's your choice. However, people have the right to make an informed decision. They can either believe me, disbelieve me, or become interested enough to go find data one way or the other themselves.

Deal with it.
i do believe you are mistaking, read my last post
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Old 03-09-2008, 10:15 AM   #25
Arctic Penguin
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Quote:
Originally Posted by williaty View Post
Well, first of all, you can look at the fact that the data sheets for both of those products contain chemicals known to be corrosive to "yellow" metals. Then you can go ahead and look at the fact that neither of those lubes can be GL-5 certified due to the amount of un-encapsulated Sulfur in them (which is corrosive to brass). Then you can talk to a couple of the big name Subie tranny shops (or just read their posts on here about this topic) where they report that the majority of the transmissions they rebuild where Synchromesh/max had been run have severe pitting of the synchros.

If you don't want to believe me or them, that's your choice. However, people have the right to make an informed decision. They can either believe me, disbelieve me, or become interested enough to go find data one way or the other themselves.

Deal with it.

so that means that the gm and chrysler transmissions that these fluids are used in contain no yellow metals at all??

and your point is an assumption

this is not proof in any way

lets see some real proof of this hypothesis or it is just that
no proof = hypothesis

not fact


lets see PROOF

post it


and having the differential and trans gears sharing the same lubricant does pose interesting lubrication issues that would seem to contradict themselves
so what is the answer??

it isnt in hypothesizing and posting hearsay or conjecture or wives tales
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