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Old 11-24-2004, 07:49 PM   #1
Jaredm83
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Default Can I put all "GM Synchromesh" in my tranny?

Hey all, Im getting ready to change the gear oil in my tranny. Can I put all sunchromesh in there or must i put some 75w90 in it also? Does anyone know if the synchromesh is gl-5 ? I need answers before 5 because the only place in town that has the redline 75w90 closes at 5!! Oh, and whats the capacity of my tranny if anyone knows off hand? Oh, ps, is a 98 Impreza L with a 5 speed.
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Old 11-24-2004, 10:22 PM   #2
rogerd
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GM Synchromesh is NOT GL 5 or GL 4 - it's specifically designed for a straightforward synchro transmission that does not have a crown wheel and pinion type final drive in it - they require a lube that supports very heavy tooth loads where the teeth slide over each other. The reason GL5 is specified by Subaru and others is to properly lube the final drive.
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Old 11-25-2004, 10:15 PM   #3
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I've had straight, undiluted synchromesh in my tranny for around 15,000 miles. Everything has been great, so far (knock on wood) I don't see why it wouldn't work, knowing the reason GM contracted Pennzoil to manufacture this magic fluid. It's a good story. I put it in my brother's Supra R154 5spd and it completely eliminated a horrendous 2nd gear grinding.
I love the stuff.
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Old 11-26-2004, 07:09 AM   #4
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GM syncromesh is basically a dexron III auto fluid for all intensive purposes.
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Old 11-26-2004, 08:50 AM   #5
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1qt synchromesh
1qt lightweight shockproof
and the rest 75w90 Castrol HypoyC
=

Last edited by Uncle Scotty; 11-27-2004 at 09:54 PM.
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Old 11-26-2004, 04:27 PM   #6
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Have to give another vote for Uncle Scotty's blend, cleared up my first gear grind. I'm pretty happy with it after having Neo in it for about 20K.
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Old 11-27-2004, 02:15 AM   #7
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i put in about 2 qts of redline 75w90 synthetic and about 1.7 qts of synchromesh, cleared all my grindling problems... thanks guys
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Old 11-27-2004, 09:53 PM   #8
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Quote:
Originally Posted by jjunior887
Have to give another vote for Uncle Scotty's blend, cleared up my first gear grind. I'm pretty happy with it after having Neo in it for about 20K.
1qt synchromesh
1qt lightweight shockproof
and the rest 75w90 Castrol HypoyC
=


W00t ! ! !
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Old 11-27-2004, 09:56 PM   #9
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Haha, I wonder if you would chime in w/ your concoction!
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Old 11-28-2004, 11:45 AM   #10
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Quote:
Originally Posted by 5spdfrk
Haha, I wonder if you would chime in w/ your concoction!
Hey whatever works, and it does, well.
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Old 11-28-2004, 02:22 PM   #11
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Quote:
Originally Posted by jjunior887
Hey whatever works, and it does, well.
Yeh, from what I hear it is teh stuff. When I change the rear diff fluid, I am also going to do US's concoction.
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Old 11-28-2004, 02:59 PM   #12
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You do not need any special "concoction" in the rear. The issue is only with the tranny where you have to lube both final drive and the "gearbox".
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Old 11-28-2004, 04:25 PM   #13
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Yeh, after reading what I typed I see how you could think that. What I meant was that when I go to change my rear diff fluid, I will change the tranny fluid at the same time.
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Old 11-28-2004, 04:50 PM   #14
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I used Amsoil 2000 75w90 in my rear diff.....seems to be working just fine....I would NOT use my 'cocktail' in the rear diff.
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Old 11-28-2004, 04:58 PM   #15
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Dont worry, I wan't. I have the common whine at 55-60 and I am guessing that it is in fact my rear diff. I have heard that putting better fluid in there will help reduce it. Is this true?
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Old 11-28-2004, 05:03 PM   #16
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Dunno about the whine....mine makes no noise...that I can hear, anyway
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Old 11-28-2004, 10:34 PM   #17
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My 95 always had a slight whine at speed in 3rd and 5th (but not 4th). I put that down to gearbox build tolerances/quality. Dumping the 75/90 and going to Valvoline Durablend 80/90 quieted things some - but made no difference to the "slow" synchro on 2nd. Basically these trannies are weak, and no amount of oil selection will fix that.
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Old 11-28-2004, 10:49 PM   #18
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Mine is usually in 4th and 5th when I am off the go pedal. If I press the gas it almost goes away, but is still there. I guess I need to make an appointment w/ the subie dealer. To bad they are over an hour away.
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Old 11-28-2004, 11:38 PM   #19
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Lightbulb

I just got this from a known reputable source. He's extremely detail oriented when it comes to what goes in, on, or under his cars. Take it for what it's worth. I plan to try it myself.


I wouldn't bother with such a long-winded note ordinarily, but this is
different.

I've been very happy with my Imprezas. Great cars. But the 5MT has
never
been a high point of the car. Frankly, it was my least favorite aspect
of
the cars.

I had the usual issues. Heavy shifts. Balking. Occasional grinds.
The
first-gear lockout. These were all manageable, but took the polish off
the
driving experience.

I've tried MANY different Gear Oils. Most were lousy. Off the shelf
super-slick synthetics were terrible. The best thing I came across was
Redline Shockproof. Still not perfect, but better.

I more or less stopped thinking about it as of late.

But then, after studying the gearbox service manuals, I realized that
perhaps there was hope...

Rewind several years; GM produces a decent, but very temperamental MT
for
their newer cars and trucks. It was so temperamental that a potential
huge-dollar re-do was on the horizon. GM, not being complete idiots,
decided that it was possible to make the tranny work, but it would
require
some major chemical engineering to do so. They hired Pennzoil Corp to
'fix'
their trannies. They did.

The end result was GM Synchromesh MT fluid. Chemically, this stuff
contains
everything our Subaru trannies should need also. So I got to thinking.

And after a bit of Web browsing, I found many opinions. Now, because
this
Synchromesh fluid is application specific, it doesn't carry any GL-?
ratings. This worried some people, regardless of the fact that
chemically
it's more than adequate.

But of the many people that have used it in their Subaru and Honda
trannies,
not ONE was disappointed. Seriously, not even ONE bad experience.

So, after a bit more homework, I found that the fluid is sold at GM
dealerships for about $9.00/Quart. It's made by Pennzoil. Pennzoil
sells
it too, for about $4.50/Quart. But it's hard to find... anywhere but
AutoZone. Go figure.

So off I went to AutoZone to pick up the prerequisite four quarts.
Drained
out the old. Poured in the new. Crossed my fingers... and hopped in
the
Subie.

Well, I'm amazed. Actually, stunned is more like it. First off, it's
still
the Subie 5MT, and not my '95 Prelude VTEC. So it's not perfect. But
the
improvement is astounding. Truly. I would NEVER have believed it if I
hadn't tried it myself.

NO grinds. NO balking. NO first-gear lockout. And MUCH lighter shift
action. Again, I'm astounded.

I have no faith in 'miracle oils' and other such off the shelf crap.
I've
been using quality synthetics in my engines and brakes for years. Just
the
$4.50/Quart stuff. I'm 100% convinced that in general there is NO
benefit
to ultra-premium oils and such. Pure psychology. No science. I'll
NEVER
reap ANY gains by using $12.00/Quart Mega-Hyper-Lube versus the
$4.50/Quart
Valvolene I've been using. So you know I'm a non-believer.

But again, this stuff is truly miraculous. Pennzoil nailed it. Plain
and
simple. And it's cheap to boot. Virtually every bit of frustration
I've
had with my trannies is gone.

So, that's my story. My Subies now shift wonderfully. NO complaints.
Every time I hop in the cars now I can't help but smile. It's that
profound.

I hope this helps. Let me know your thoughts...

EriK

PS. Pennzoil Synchromesh = GM Synchromesh #12345349 or use GM
Synchromesh
FM #12377916

Jay Storm
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Old 11-29-2004, 01:10 AM   #20
JalopySiR
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Quote:
Originally Posted by JalopySiR
I've had straight, undiluted synchromesh in my tranny for around 15,000 miles. Everything has been great, so far (knock on wood) I don't see why it wouldn't work, knowing the reason GM contracted Pennzoil to manufacture this magic fluid. It's a good story. I put it in my brother's Supra R154 5spd and it completely eliminated a horrendous 2nd gear grinding.
I love the stuff.

Like I said...
Oh, and the GL "rating" is GL-S, the "S" is for special!
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Old 11-29-2004, 04:22 AM   #21
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I go with 3 qts. regular 75-90, and the last .7 gt of pennzoil synchromesh! It's nice!
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Old 11-29-2004, 01:49 PM   #22
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1qt Synchromesh + Castrol Hypoy-C for the balance = magic

No joke.
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Old 11-29-2004, 07:52 PM   #23
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I have been using 1qt synchromesh + 80w90 valvoline durablend for about 2k miles now with great results...
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Old 11-29-2004, 09:04 PM   #24
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What's the viscosity of GM/Pennzoil Synchromesh?
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Old 11-29-2004, 10:37 PM   #25
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Quote:
Originally Posted by OneOBS
What's the viscosity of GM/Pennzoil Synchromesh?

None stated AFAIK.
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