4th gear syncro gone?

[boostspike]

on my way home from the track this weekend i merged onto the highway in 3rd hammered it went to shift to 4th at bout 6000rpm and thats when it made this gringing noise n it felt F@#$ Up! driving around at lower rpm's it shifts fine though. Is it possible for the syncro to be replaced without any other parts and how much $

[wagonracer]

That's a very common issue with our gear boxes. It can be remedied very simply and cheaply with a blend of gear oils, known as "uncle Scotty's cocktail". I had the same problem which the cocktail fixed, and it made getting into first much easier as well. Here's the recipe:

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

I wasn't able to find the Castrol and substituted Lucas 80-90 synthetic. I think any 80-90 synthetic will work. It's the first two that seem the most important. I have 125K on my car with lot's of track time and now towing miles, and the grind has never returned.

[boostspike]

ok ill try that and see what happens thanks for the advice

[boostspike]

after getting all the fluids i changed it, and no more grinding i was amazed

[goofoff]

that will be the next thing i do along with my oil change.

[wagonracer]

Originally Posted by boostspike

after getting all the fluids i changed it, and no more grinding i was amazed

Glad it worked for you too. I just put the cocktail in my "new" 95 impreza L, as I was getting grind from 1st to 2nd. It worked like a charm !

[wrxshotta]

hrmm...you just mix all 3 with an equal amount of each?

[turmic]

Originally Posted by wagonracer

That's a very common issue with our gear boxes. It can be remedied very simply and cheaply with a blend of gear oils, known as "uncle Scotty's cocktail". I had the same problem which the cocktail fixed, and it made getting into first much easier as well. Here's the recipe:

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

I wasn't able to find the Castrol and substituted Lucas 80-90 synthetic. I think any 80-90 synthetic will work. It's the first two that seem the most important. I have 125K on my car with lot's of track time and now towing miles, and the grind has never returned.

Did you even read this? It tells you how much of each.

[shamrock]

Originally Posted by wagonracer

That's a very common issue with our gear boxes. It can be remedied very simply and cheaply with a blend of gear oils, known as "uncle Scotty's cocktail". I had the same problem which the cocktail fixed, and it made getting into first much easier as well. Here's the recipe:

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

I wasn't able to find the Castrol and substituted Lucas 80-90 synthetic. I think any 80-90 synthetic will work. It's the first two that seem the most important. I have 125K on my car with lot's of track time and now towing miles, and the grind has never returned.

Originally Posted by turmic

Did you even read this? It tells you how much of each.

But it will only be 1.8qts of castrol not a full 4.

Whats wierd with my 4th gear is I have a 5th-4th grind. But it is only at higher speeds. Reg city driving the 5th-4th down shift is smooth. Like on the E-way when traffic slows down, it always grinds and I dont get it. You would think that if the syncro was bad, it would do it on every single down shift to 4th, right? I always rev match when going into a lower gear. The up shift to 4th is fine. So this weekend I am going to put in some Subaru Extra S gear fluid. I have heard many good things about this fluid. Hopefully this will solve it.