Well, my second gear syncro for my other trannys are still good. (at least I thought they were) maybe I will just take it out of one of them. Yay another day under the rx7.

But, wow why are syncros so expensive?

 

Because its Mazda and they like shafting poor RX-7 owners.
Also, how hard is it to change the synchros? Is it something you can do without prior knowledge in your garage?

 

learn how the rev match and you wont have that big of a problem thats wut i did when my tranny was toast worked fine specially into second gear

 

while racing?

 

also if u have wut? like 4 transmissions wut could hurt taking one apart see wut its all about. buy a rebuild kit for like 3-4 hundred bucks (it comes with instructions) try too rebuild it if ur organized and good with your hands you should be abled to do it your self

 

btw its really not that hard just make sure when pulling everything out you keep it organized. you should be abled to do it with in a day or two

 

Ok, is this something I will have to buy at mazda or can I get it somewhere else for cheaper? (rebuild kit)

 

call mazda ask them or go to a local transmission shop im sure they have one or can order one for you

 

BTW, the Carguest premium 80w90 limited slip is the WORST TYPE of gear oil to use in a manual tranny. ANY GL5 blended with limited slip additives should NEVER by used in a manual tranny. These LSD frictions modifiers work against the synchros making it MORE difficult to shift. This is why I'll always recommend a GL4 gear oil which are almost never used in rearends and never have the LSD additives. Redline has a product called 75w90NS which is a GL5 gear oil WITHOUT the additives. But, I prefer the MT90!
There are other GL5 gear oils(good luck finding them) that can be used in a manual tranny. They'll specifically state not to be used in a LSD diff, or require a bottle of LSD additive.

http://rx7world.com.phtemp.com/catal...ts_2819123.htm
http://www.alltransparts.com/search_transmissions.php
http://www.drivetrain.com/mazdaendload4_5sp.html

 

I swear by Redline MT90.

 

rebuilding a manual transmission may not be all that difficult for someone who had rebuilt transmissions before but in comparison it is much more difficult than say rebuilding a rotary engine and you see how many people tend to screw that up. as you can see internal transmission questions rarely get answered around here since it is cheaper and easier to just replace the trannies.


price of the syncros ranges anywhere from $35 to over $80 each depending on which you need.

most of the people i give estimates to for tranny overhauls usually wind up just getting a used tranny.

 

Yeah, I have tried twice now, both ended up being bad (or already had used syncros) >:0( I will try the redline tranny fluid and see if that helps. Thanks.

 

Me too. I use MT90 in the tranny and their 75w90 gear oil w/ limited slip additive for my LSD.