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I guess its the synchros?

Whenever I shift into second it makes a nasty grinding noise while Im shifting, unless its below 1700 or so.

Anything that can be done about this, save having it rebuilt?

shit there is something you can put in there that really refreshes everything and i cant for the life of my think what it is..... piss

mine grinds into 3rd when it is warmed up and shifting even a tiny bit firmly. so ive been looking into quick and easy fixes myself.
Ive read that you can try running the trans with ATF for a couple days, it has a ton of detergents and will clean out the varnish from the insides, then run "uncle scotty's cocktail" which you can find the recipe on nasioc. people with wrx's talking about their gears already grinding... wierd huh.

Unless the clutch is not fully disengaging, it's the synchronizer, so you should refer to the first sticky in this forum and go from there.

vrg3 wrote:Unless the clutch is not fully disengaging, it's the synchronizer, so you should refer to the first sticky in this forum and go from there.

Ditto....try different fluid.

synco mesh?

Mine does it on the 1-2 shift when warm. Its the worst when I've been cruizing on the highway for a while. I had my 5MT rebuilt a few years ago when it was doing the same thing and the guy the that did it said the balk ring (brass part of syncronizer) was very worn.

After a couple summers of selling books door-to-door, it started to do it again, which iwasn't happy about. Going in and out of driveways all day, shifting 1-2-1-2-3 and so on wore the syncro out really fast. Now Ijust take it easy going into 2nd. I don't want to pay another $1200 for a rebuilt when it will just happen again, and I'd just end up breaking the tranny anyways.

DO NOT PUT ATF IN THE TRANS.

There isn't any varnishing that goes on inside the trans for that to be required.

Drain fluid. Run 3 quarts of Redlines Lightweight Shockproof and 1 quart of Motul 75W90. If you can't get it local, give me a call and I'll hook you up.

Going to Group-N Engine & Tranny mounts seemed to help my tranny problems... no emperical data to back that up, though.

Did the same for my original grinding issues. I got them before I was really into modding per William's advice, and it was probably the single best modification I did to the car.

So drove the car this morning after hammering it offroad last night, no grinding.

I think my tranny is haunted.

Noises rarely go away on their own. Might be the calm before the storm.

Im wondering if it has something to do with cold oil

yeah go take a long cruise and I bet it starts up again. Mine does the same thing when its hot outside and I have been on the highway for ~20+ miles. I am wondering if we can fit a tranny cooler?

Why not use good fluid? Sounds easier than finding an inline pump that will be capable of pumping trans fluid, and then finding two good spots to tap the trans case.

I'd try good fluid, then see how it goes.

Im using a synthetic/dino blend 75w90

Supposed to be pretty good

Yes, cold fluid helps the grinding syncro issue.

Use either uncle scotty's mix, or what Phil recommended. You will NOT be disappointed!

Alright, next paycheck Ill give it a shot

Splint, I just did this Scotty's Cocktail and it seems to be working - 2nd gear sychro grinding problems are now gone. But reverse is a tad harder to get into but heck I'll take it! I don't know who this Scotty is but I'd could just kiss him. Don't let the curmgeons here 'explain' why this works and talk you into to doing any thing else. About 20-30 folks on Nabisco have benefited from it - never heard bad word one on it. Cheers, Adam

Research from Nabisco....

Uncle Scotty's Cocktail for Subi Tranis:

1qt Redline lightweight shockproof
1qt Pennzoil Synchromesh
2qt Castrol HypoyC 80w-90

Uncle Scotty says...

" ...juust do it....and remember.....do NOT dump 4 qt in the tranny!!!!!!!!

That WILL overfill it---bad juju.

Add ~3.3 - 3.4...drive the car---check....repeat a couple times....make SURE it isn't too much before ya add more.

Add the lube SLOWLY into the dipstick tube or you WILL get more UNDER the car than IN the tranny

...and the rear diff can use GL-5 whatever.....I'd use a syn like M1

Example Costs:

LW Shockproof: 8.99
Castrol 80w90: 4.29 x 2
Penzoil Syncromesh: 6.09
RL 75w90 for the diff: 8.99

Grand total: 35.13 w/ tax

Do we use Red Line SuperLight ShockProof or just the LightWeight ShockProof? Lightweight (dude read the recipe)

Here is the Official Scotty's Cocktail Pouring Order

1. 1qt. Lightweight Shockproof

2. 1qt. Pennzoil Schromesh

3. Finish with the remaining Castrol Hypoy C but only fill to the Full line on the dipstick. Do not dump in both remaining quarts. I believe total volume for the tranny is 3.4 - 3.6.

There's no reason Scotty's cocktail would work better than what I recomended.

Motul is good for bearings, shockproof is good for synchros.

Scotty's cocktail works exactly the same if you use two quarts of shockproof and the remaining amount filled with High quality 75W90.

We've done a lot of testing. We've run Scotty's cocktail. It works. We find that shockproof/motul works too. We also find that the Motul/shockproof combo is much easier to find. We've run our "cocktail" in cars making a LOT of power, and it's been great. We've run the same cocktail in cars for tens of thousands of miles, and it's also been great. In our experience, it's the way to go. Plus, it's more readily available than the Cocktail.

Also good to note -- the Syncromesh fluid is the only component of Uncle Scotty's cocktail that is actually completely wrong for our transmissions. Its viscosity is too low and it doesn't have enough extreme pressure additives.

Redline never officially recommends ShockProof for streetgoing cars, but that's different.

is the penzoil syncromesh the same as GM syncromesh? that is what the previous owner put in my car. i think it shifts pretty good but could shift better.

It IS the same stuff.

Yes, finding all the Scotty's incredients was a PITA but check out my ongoing review in the products section to see how this all turns out. Doing two track days in July so I plan get things really, really hot...

Splint, did you try it yet?

No just went to the parts store today...

They have to order in the redline shockproof, and its $18/qt

Holy shit.