daveyfx

This thread is just to get a fresh start on the prior discussion about the ZX2's G5M fortitude...

As stated in the post "transmissions" (or whatever it is), we ZX2 owners have been having some difficulties over the years with our transmission, the G5M, which shares many similarities with the transmission the Protege is equipped with.

The primary weak links are the brass synchronizer rings, which also have very little contact patch, and the aluminum shifter forks. The differential is also quite weak but the problems related to it are far less than those related to the synchros and forks.

I'd like to know what sort of internals we are looking at with the G15M-R in the 3rd gen. Protege. The transmission cases are inevitably the same aluminum housing, so gear swapability is a great possibility. Could someone please post some information relating to this matter?

Thank you!

dave

Maxx Mazda

Holy ****! You're oneinformed ****!

All i can tell you is that thw G15M-R is a fairly robust tranny. Not that you could ever run like 500HP through it, but with a built-up engineit should be able to handle more power than most people require. I've only ever heard of 2 trannies breaking, and that was because the owners shifter far too hard andfast and ended up breaking the shift forks.

As fopr putting one in a ZX3... Not sure, I'm sure they're different enough to make it expensive though.

daveyfx

Actually, the ZX3 uses the MTX-75 transmission which has far more differences than similarities to the G5M. The ZX2 essentially shares the Zetec motor with the ZX3 (aside from the fact that the ZX2's head design is a bit different).

You say that you know of only two G15M-R's breaking? My own G5M has experienced numerous problems regarding the synchronizer rings breaking, but I have had no problems with the forks.

Keep the advice coming along, folks! I very much appreciate any input you have to offer!

dave

Maxx Mazda

Yoiu're talking ZX2 as in Escort? My bad, I was thinking it was just a typo.

The G15M-R seems to be a really (relatively) durable transmission. Do you drive a ZX2, Protege, or both? When you said your shift forks have never bent, what car are you reffering to?

The 2 cases I heard of were from people who liked to jam the shifter into position and ended up either bending or breaking the forks. Can't remember.

daveyfx

I myself own a ZX2 and have driven numerous third generation Proteges. I've pulled apart a couple G5M's and inspected the gear box. The gears are extremely compressed and fabrication of larger synchronizer rings looks to be tricky.

Right now, my fourth gear ring is almost gone. This is simply rediculous considering I do not speed shift or power shift ever. I match revs and baby the gears.

It sounds like you guys are blessed with more durable synchronizers. Is there anyone here who can tell me what material the internals are composed of?

dave

daveyfx

ttt

Gregersonsalvag

I'd personally shoot for the G25m-R out of the protege 92-94