Im just wandering if I need to replace it right away. Is it going to get worse? or cause further damage? It grinds every time it goes to 5th if you try to work it in slowly it's not so bad sometimes.

 

Eventually you will not even be able to ease it in and it will grind consistantly. At that point I would definatly consider changing the synchro or trans as they have the potential to damage nearby 3rd and reverse if I remember correctly.

Personally, I went the used JDM trans route after I blew my synchro and I enjoy it with no problems. Hope this helps.

 

If it's beaten up badly enough, it may come loose from where it's supposed to be and mangle some more parts.

If you always double-clutch or make nice careful shifts into 5th, it won't put much stress on the synchro and you can make it last a pretty long time. That's assuming it stays put.

Dave

 

Thanks for the info! i have never heard of the JDM trans route where would i find one. I dont need a new transmission I hope!! what do you sugest I do

 

You can go a couple different ways:

1. Buy a new transmission >_<
2. Have a shop rebuild your 5th gear synchro
3. Buy a used JDM transmission

The thing is it depend on if you do the work or not on which route I would go. If you have the means and knowhow to drop and open the trans, then thats the most cost effective way (not including your time) since a synchro is only a couple bucks. If your in there you may as well do them all.

For the transmission internals layman like myself, I contacted a local used trans shop and got the JDM trans with 35k + for $400 and installed it. Easy-peezy-japanesey.

Last but not least, buy a new one. I highly recommend against this though $$$$

 

If it is that bad then pieces of it have already fallen about inside and looking for a place to screw womething up even more

tom

 

How long will it last? and another question Im getting a greddy SMIC with the greddy elbow and i bought a the HKS super SQ do i need a flange or can they just put in on or what?

 

HKS uses a circle type and Greddy uses a more oval shape, you need to buy a flange from HKS or other distributors online and weld it on.

 

thanks

 

Do a search for the how-to. The biggest job is just pullng the transmission, once out, it's not that bad, or you could just take it to a shop. And the synchro itself isn't expensive, if your transmission is otherwise sound, why go to the expense of buying another (maybe of questionable quality)?
FWIW, mine just had the normal grind to it, but when I went to pull it off, it fell into two pieces. I wouldn't wait TOO long.

 

Thank you

 

Replace it ASAP...don't get caught up in my situation I had a year ago (see link below). However, now...she's nice n' dandy and smooth and practially brand new! ^_^

https://www.rx7club.com/showthread.p...h+gear+synchro

P.S. ...the part i talk about the "rattling" end up just being a chipped gear...which was also replaced. It wasn't a loose piece physicaly broken off...whew!

 

sgtblue was it you that did one of the write-ups on that syncro replacement..? just curious..judgeing from your statement youve either done it or helped someone else do it.
big question could it be done in a week? i have a couple contacts in jap town that i can get a tranny for a pretty good deal im sure but i cant pass up the chance to gain knowledge on how to better service my car... ive skimmed thru most all of the write ups and i kinda understand the basics im more hands on then most so i learn better when im up to my elbows in grease reading from the pub. lol.

 

there is a technical bulletin on the 5-th gear synchro from mazda. its and updated part,you should search around for the tsb so it doesnt happen again

 

The only 5th synchros you can buy are the updated ones. Unless you're a bad driver it won't happen again.

Dave

 

Mine was broken for 6 years so unless you're speed shifting into 5th you can live with a long while with no problem. Even after that 4th and 5th gear showed hardly any signs of wear. Just let the rpms fall and it wont even grind.

 

Yes, I did it...but never did a write-up. And I did it with the help of a knowledgable forum member (poss). He already had done his, and still had the extensions he'd made for the gear puller, which made it much easier. Once the transmission was out, he walked me through it, pretty much according to these instructions: http://mahjik.homestead.com/files/ho...o/synchro.html
Even with me clumsily doing some of the wrenching, it only took about an hour. If Ryan had done it himself, probably alot less. Basically, if I can do it, anyone can.
Yes. IIRC, while the transmission was out, I also replaced the clutch, PP, throw-out bearing, shift-select spindle (with the "upgraded" one), clutch fork and rear transmission seal. I had all the parts ordered ahead of time from Malloy and fresh fluid ready. It sounds like your alot more experienced at wrenching than me and as I recall it took me at least a couple of full days, but that included wrestling with the flywheel nut (another story), which would be optional for you.

 

Great info thank you very much

 

Hi,

I have also that 5th gear problem,It always grinds when I put it in 5th gear..

What parts i need for fix that problem!? I know only synchro and shift spindle is welcome..

My friend order parts for me from mazdatrix.com , but can yanyone say what parts i need and part numbers for them!? Thanks, Jaape