I've found a G50/00 what do I do now?

Hi

Apologies if this seems simplistic but I am a perfectionist, unfortunately I have all the skills of a botcher, and I need to get this right.

It appears that I’m very near to getting A G50/00 transaxle from a 88-89 Carrera 3.2 around 70,000 miles so :-

1 What are the steps for checking it is OK. I am okay if I can follow a manual but no good at working things out for myself so if there is one where to I get a manual from .

2 Is it worth just getting a gearbox specialist to rebuild it. I have access to a very good mechanic who should be able to advise me if its a DIY job, but he is not a Porsche specialist.

3 What steps do I take, and what is the best way to make it look all shiny and new.

All advice greatly appreciated

Thanks

Nick
 

Lynn Larsen

Lynn Larsen
Do you feel lucky????

There are some specialized tools, particularly for reassembly, needed to R&R a G50. How much power do you plan to put through it? If it is going to be 300-350HP or more, IMHO, I'd have it gone through by someone who knows Porsche transaxles well. Do you plan on putting LSD or Torque Biasing diff in it? If so, let someone experienced do that: the worst wear caused by lots of torque on one of these boxes is the ring and pinion. If the lash isn't set properly, you can chew one up before you can say, "Bob's your uncle." If you do decide to rebuild it there are a few things you might want to do. While the G50 is a strong transaxle! the shift forks have shown themselves to be a bit weak in a racing situation. There are billet parts available which are a lot stronger. There are a few other things you can do, but which is/are economically justified is highly dependent on how you plan to use the car.

When you have made up your mind, let us know and surely someone in your area will know a good Porsche transaxle guy. If not there are several well know shops that you can send it to.

As to pretty and shinny, it's aluminum: polish to desired luster (flitz ball or some such contraption might be helpful.)

Also, spend some time with the search function on the forum and you will probably find more information than you can handle in one sitting or, perhaps, even three or four.

Regards,
Lynn
 
Sorry I should have been more specific I’m still a bit new to this.

I have decided on around a maximum of 370HP 350 lb/ft torque so as I understand it and have been advised the standard box should be ok.

I’m looking for advice or tips on any easy ways to spot and rectify any wear, by either me or my friendly mechanic. I don’t want to get to the point a long time down the line of finishing the car and having to take the box out to get it fixed

The other thing I should have pointed out s I live in the UK.


Thanks
Nick
 
Tranny is fairly easy to take apart. If your mechanic friend has rebuilt alot of manual trannies, this one isnt anything special.
At 70 000 miles, assume it needs a rebuild. At the very least, the 2 big main support/thrust bearings will need to be replaced and new synchros are a good idea. Parts are not exactly cheap, synchro's will run about $900 for the whole set, (or just do 1, 2nd, 3rd, they generally take the most wear and abuse) those 2 bearings are about $200 each if I remember right.
If you have never done a manual tranny overhaul, dont bother trying to learn on something this expensive. And just following the manual isnt enough, you need to be able to spot problems and that only comes with experience.
If you just want to check it out quick and dirty, the only thing really doable is pop the diff cover off and look for large bits of metal, if you see some, tranny is a mess.
 
Back
Top