Thomas928

Hi Guys

928s , 1983, Euro, Automatic

I have a bad transmission box, it leaks at the sealing (orange/red) ring behind the torque converter, it takes time to get into the reverse gear and when giving it a bit more throttle it shifts right from 3nd into 3rd gear. On top of that I can see that somebody has been fiddling with it in a 928 unworthy way.

I have a guy that can fix the problems, but he's 'too old' to get the gearbox from under the car and I do not have the means to do so myself. So my plan is to buy a second hand gearbox, have him restore it to it's full glory and then, at a time of my own choice, put the revisioned one into my 928 and have the old one revisioned as well to either keep it as a backup, or sell it. This way my oldtimer friend can take all the time in the world to get it revisioned and I won't have to store the car at the place where the box gets taken out.

So long story short , I went underneath the car to check the part number/code of the gearbox. I expected a number like a22.04 or something, but I cant find it. Instead I did find the number as shown in the picture.

Can anyone help me determine what kind of gearbox I should buy?

Thanks a lot!!

Speedtoys

Look straight UP at the back bottom edge of the differential housing..

And, is that the fluid level with the car on, or off??

Also, this is a 944...but..very much the same ideas.

Thomas928

Thanks I will go check in an hour, because I am just really curious.

About the level: this is with engine off, everything cold. The guy I bought this from has done a lot of things wrong I think.... I'm just finding out step by step I'm afraid

Speedtoys

Ok,. #1.

This is a 944, not a 928.

At this level, start car, add fluid until at the 'full' mark when the fluid is cool, right away. Double check when warmed up..should be a cool and warm line on there.


Second this should be about the level with the car running, I would say this trans is 2-3 quarts LOW on fluid, and that's why it's not running right.

Thomas928

OK, thanks a lot, thats the first thing I'll be fixing tommorow then :-)

I was in the understanding that the 'gap' you see in the metal holder is the level it should have....

Speedtoys

The limited photo I see here, its a 944

Here is a 944 auto trans fill reserviour:
http://www.autoatlanta.com/porsche-p...section=309-05

Here is a 928 one:
http://www.autoatlanta.com/porsche-p...section=308-50. (#40)


So...that's where Im confused...I can be wrong, but Ive NEVER seen that container on a 928..everything about it says 944.

Thomas928

Could it be that some guy thought he could just smash parts together and make some frankenstein gearbox? I mean, look at the black kit which is sitting on it as well....I wouldnt be surprised...

Thomas928

This is the gearbox I would like to buy and do a revision on. Although entirely covered in oil and smudge, it has the same reservoir, and it definitly comes from a 928.

Rob Edwards

US market '83s got the A28.01 4-speed, '83 Euro S automatics still used the A22.04 3-speed with this early-style reservoir, which was used on all '78-82 3-speed automatics. That rear crossmember is 928-only, all day long.

I don't know s*** about the care and feeding of automatic transmissions but that looks like an A22.04.

gazfish

Curious how a 944 trans could be installed on a 928, I thought it was completely different with most of the gearbox behind the drive shafts.

Speedtoys

Thanks Rob, I couldnt find the right drawing for...this..but..OK!!

Thomas: Yes, fill it correctly..and try it again.

Do THIS:

Thomas928

Thanks guys, I appreciate your reactions!

How do you guys look at adding a leakstop to it for the time being? I'm hearing pretty bad things about it, but then again, when I check this forum, there is people saying they added it and the gearbox has been fine for years at end.

Speedtoys

It's good for a little while..I had one so bad that when it lose a quart, all I put in was stop leak..and then it stopped.

But..this means a rebuild is in the future for sure..its not a long term fix.

Mrmerlin

Please NOTE,
The picture posted by the OP is of a 3 speed MB built 928 transmission with the round tube fill tank.

NOTE once the engine is idling in park and warmed up,
the level should be close to the top edge of the cutout at about midway on the side of the tank

NOTE you should also replace the trans mounts, these look crushed

mj1pate

Use the manufacturer recommended amount of AT205 in the transmission. It will very likely stop your leaks all the way around. This is a remedy if you are NOT going to replace any leaky seals. AT205 is a polymer with waterlike consistency. Every rubber seal in the transmission will expand to retake up available space. If the seal problems are those that are fixable, like oil pan gasket, front pump, front piston, TC seal, Bowden cable seal, etc.. and you’re going to drop the transmission anyway; why not just replace these seals and put the transmission back in? That is particularly if just getting the correct fluid level will help shifting issues.
Your mechanic friend should realize how expensive and hard to find some of the genuine Porsche automatic transmission rebuild parts are. If you can get that transmission at least shifting correctly, consider a reseal of the usual leaky seals. That should be a no-brainer for your transmission guy