checkmate1996

Time for a rebuild. I believe the whine is coming from bearings going bad, either your main or the roller bearings over the main. Also, on the older transmissions, the syncros and dogteeth are ONE unit. Another item that gets over looked is your anchor bands. These items get worn out causing a lot of problems as well. Check out my rebuild thread. It took me 18 months to find all the parts and rebuild. I think I got the last two roller bearings in the US at the time. Some porsche dealer in Maine had them.....

Your best bet is probably to just buy the an 85 from Greg and be done. Save time and money and still enjoy driving the rest of the summer.

FBIII

So I can use any late gearbox, but going after 1982 it will become increasingly more difficult to find the 2.75ish final drive ratio.

checkmate1996

I can't remember the rennlister from sweden (IIRC), but he was the resident torque tube / tranny specialist and had complete write up on this forum on what combinations would work. I want to say his handle stared with a 'V' ... it's been a while...

There are some sacrifices that may have to be made. When I tore into my g28-05...the the final gear had 54 teeth... so a 2.54 ratio...

medipedicman

That would be Vilhuer (Errka). I just searched his threads looking for the one referenced below. I ran down several rabbit holes and learned a lot........ but I cannot find the one referred to.

GlenL

x2

More specifically, does an '85 BW tranny require a differenttorque tube?

IcemanG17

When Doc rebuilt the transmission in Casper it took TWO cores, plus soft parts to make one transmission...I was lucky that the hard parts were still good.....didn't need gear sets or bearings...only synchros-seals-etc....

I still have two more, plus the good one in the car.... Knowing the limited availability of parts was part of my decision to go with a G28-03 car....since they made lots and about 1/2 were 5 speeds back then...

IcemanG17

Glen
Depending on if your 80 is a G28-03 or G28-05.....if it is the "later" G28-05 than its pretty easy to swap the transaxle....Sean just put the 1989 5 speed from the old widow into his 84....

The early G28-03 cars have different TT, shift rods and rear crossmember...

Another factor is the G28-03 boxes are much lighter than the later ones....my freshly rebuilt G28-03 is 122lbs....vs about 145lbs for the later boxes....I have no idea why....

checkmate1996

Here is the thread that I was thinking about:

https://rennlist.com/forums/928-foru...and-tools.html

FBIII

Brian when you say the rear crossmember is different are you referring to the aluminum cradle that supports the transmission and is the attachment point for the rear suspension? If so going forward or back requires a lot of parts and work.

IcemanG17

From what I understand you must run a G28-03 rear cross member with the G28-03 trans since Porsche shifted where the transmission mounts...I would imagine a decent fabricator could make it work....but its not that hard to put in the right crossmember

GregBBRD

Yes, the length of the torque tube and the entire rear cross member are different for the G28/03 transmission. Conveniently, if you have the G28/05 transmission, you can use any later model transmission.....made after the G28/05.

If you want to retain the original box, with the shorter gear ratios, send it out, I can take it apart and see what it actually needs. Although, looking at your "list" of problems.....is a bit disturbing.

GregBBRD

I have not. Can they make complex metal pieces, like bearings, now?

69gaugeman

No. Not gears either. Or springs. So really nothing that can help you....lol

Vilhuer

Good thing is that G28/03 cross member has same dimensions as all automatic gearbox members.

RennPartsDirect

Is this information still accurate? Does anyone have any updated data to share regarding these numbers? I personally can't believe that there are so few of these transmission in existence... I can only assume that the bearing shortages have only gotten much worse. Has anyone found an alternative supply for the bearings?

SS