Will do! Thanks

i'm with the fix what you got crowd.i have done this job many times before and the results have always been good.there is no need to worry about debris going thru the trans after fix and ruining any other parts of trans.if you are going to buy a used trans to put in i would suggest that you have the reverse clutches replaced before you put it in.these clutches are the weak part of an otherwise strong reliable trans.benz used them for upwards of 15 yrs while making running changes to the valve bodies.if my memory serves correctly[doubtful because of advancing yrs]porsche designed the 722.3 for mercedes.

You can add my vote to the fix what ya got crowd. (and I speak from limted, 1 transmission, experience....)

J. M. van Swaay

How big of a mistake would it be to go to a different shop to have the reverse fixed? Like a non mercedes shop or transmission place?

My mechanic, and another Mercedes mechanic I spoke with both want too much for that job.

I personally would stick with someone that knows Mercedes - but it's tough, a lot of shops won't do the reverse only repair, or price it high. They want to do the full overhaul, and it's their choice, can't blame them really. Are you able to tackle it yourself? There's quite a bit of information out there.

Nope, over my head, no place to do the work, and really don't have the time at the moment, which is a drag because I am somewhat mechanicaly inclined and I enjoy working on my car. I will need to source this out.

Thanks for the input though.

Found on Porsche 928 Forum
 

http://forums.rennlist.com/rennforums/928-forum/476960-did-mercedes-manufacture-the-complete-928-automatic-transmissions.html

My car's gear box has Porsche designation of A2816 3L 02446 stamped on the intermediate case.

In the Porsche Manual for Automatic Transmission A28 states on page 3 "The digitis stamped on the right side of the transmission case above the ATF sump are for production control only".

In actual fact these numerals are the Mercedes Benz series number and the transmission number.

For example, the 722 400 02 147104 has the following meaning:
a. 722 designates Automatic Transmission
b. The digit 4 designated the Model of Transmission. My car has a 722.3 series type transmission and the 3 designates that it is a 4 speed/6 bolt pan/Large Case
The numeral 4 above would designate that it is a 4 speed/6 bolt pan/Small Case.
c. The follow "00" designates the type of automobile or Version Number and is used to determine what modulator and the adjusted pressure required
d. The last six digits is the MB serial number

From the above I would suggest that the auto transmission was manufactured by MB, as a standard MB box with the ends designed to fit to the Torque Tube and the Transaxle.

This can be verified if you view PET and you can see the actual Porsche Part Numbers prefaced by 928 and the transition into the 960, 722 and 126 etc.

Not sure of the part numbers prefaced by 960, however, the 722 numbers and the 126 numbers are MB numbers, as far as I can determine.

Tails 1990 928S4 Auto

928s have a 722.3 and they hold up well, no more torque there than a 119 or 120 motor.

Sources
 

You may want to check Sun Valley Mercedes Dismantlers, Inc.
"$1500 exchange. Our transmissions come complete with a torque converter and 2 year unlimited mileage warranty." I have read good things about them elsewhere, and frieght101.com is a good choice for shipping.

I was fortunate to buy a used 722.350 MB factory rebuild with 40K miles, from a mod on the board here - $500 plus $125 shipping from Ohio. I got a quote for labor on the swap @ $600.

Good luck with your project :)