I have a b18b, and when I insert the 3rd gears, it like if I was in neutral. If i push more my shifter it grinch. What should I look for? syncronizer or fork?

 

fork is same for 4th gear too
maybe it is 3-4 gear selector sleeve+3rd gear synchro

 

Yes the selector sleeve is used and the synchro is used

 

is this picture above actual one?
sleeve is in very bad condition from one side probably this is 3rd gear side
4rh gear side is in good working condition
you need to replace it with new synchros and new rings

 

Yes it mine, should I buy OEM or http://shop.synchrotech-transmission...1-SO-120AC.htm

 

hardened with carbon synchros would be better
but oem will work fine

i have second gear problem and i am going to disassemble gearbox tommorow
symptoms are same and i will order oem second gear sleeve and all stock synchro set

 

The sleeve and synchro are absolutely trashed. Synchro spring isn't pictured, is it missing or just removed after the transmission was taken apart? What does 3rd gear itself look like? I'm guess it's probably junk too.

Having used both, I'm partial to carbon synchros.

 

I removed the spring, the gears look fine. I will take a screenshot.

 

 

The picture is at a poor angle, but from what I can see 3rd gear looks junked too. Those engagement teeth are worn a lot. Replace the gear set.

 

i think i will buy an used tranny. my fork are used an look to much free in the case

 

Just as a heads up the one you buy may look just as bad. I've had a few guys bring me transmissions they bought that were supposed to work fine, no grinds only to find out they needed as much or more than the transmission they were replacing.

 

I agree. Plentys of junk used ones out there sold as "mint". These gearboxes are mostly all 10-20 years old or more and had hard lives.

 

The newest ones are almost 13 years old now. It's not really the age or mileage so much as how they were driven though and how often the fluid was changed.

 

syncrotech sell rebuild transmission for 1000$ + my old one.

 

I've dealt with Synchrotech before, not for a complete transmission, but I have purchased parts from them, they're good to deal with. $1000 is pretty reasonable for what you get. A nice clean transmission that's basically new inside, with a warranty and a company that will stand behind it.