M32 Breathers

[Blue Moon Sonic]

Warrington Transmission Centre in the UK has been great with getting a pile of stock M32 parts, shipping takes a while but the prices aren't outrageous. They're all clean and look like they've been blasted.

I'm pretty sure WG Motorworks could upgrade the synchros if that's the issue, but I don't think it is. I've not had a problem with the RPM of the shift, generally it's a random.. lock up/cant shift/grinding issue(not from missing shift)..

I actually had a discussion about this with my local parts guy at the dealership down the road from where I work. It turns out third gear is a common failure point in the M32 transmission if I remember correctly and it seems to be a common issue once you start to really raise the power levels.

I really don't think that heat is a big problem here in the US, we dont drive at high speeds shifting for long periods of time. If your worried about heat build a cooler system with small pump-tap into drain, then back in the top of trans

The trans cooler is overkill, but not a bad idea

Back up one moment here about the trans cooler being overkill. It's necessary for those who have modded the piss out of their Sonic's equipped with an automatic transmission. Just doing a tune, intake and down pipe already puts you past the acceptable power levels these transmissions can take and will cause the transmission to get too hot which can cause premature transmission failure. I know this because I've already ran into this issue and need a way to resolve the problem before adding a big turbo kit on the car.

 

[mysterslyckster]

You're not kidding! I have a stock tune on my 2013 RS automatic. Regular temps here in OK get to 90-100 in the summer. I've installed a trans temp gauge which senses temperature coming out of the trans going into the cooler in the radiator. Just cruising down the highway at 60-65 on a hot day, trans temps get up over 200F for extended drives! Glad I use Amsoil once a year for changes. A cooler setup is definitely needed for tunes and any serious power adding.