checkmate1996

I currently have g28-05 tranny in my 79. I believe this model year was from 82-84. However, I am looking at purchasing a rebuilt g28-03 tranny. Can anyone confirm this a drag and drop?

Andre Hedrick

Check torque tube lengths, call 928 Intl.
I know a 05 to 08 works and will find out if 08 to 13 works soon.
Cheers,

Vilhuer

To swap G28/03 to 05 or other way around both TT and rear subframe need to be changed. Other possibility is to modify TT center shaft.

checkmate1996

Thanks...don't think I'll be doing that project anytime soon...

Andrew Schauer

Erkka,
How much of the rear subframe needs to be changed? I know the torque tubes are different lengths, (2mm or so?) but I thought there was enough adjustment in the transmission mounts to make up the difference?
Reason I ask is because my 1980 model built in late '79 has an 05 transmission rather than the 03 it should. From the rest of the work on the car, something tells me the torque tube and subframe did not get changed at the same time.

Vilhuer

Andrew, I think your left from factory with 05 unless it is very early '80. Last US car to have 03 and longer TT was 92882 00054. Factory did 1589 or close to this number '80 US models. This means only first two weeks of model year production uses old transmission type.

Difference in TT outer shafts is 30mm or very close to it. Transmission mounts do not have any play in them but subframe has some. Still I think its way too little. I might be possible to force the difference from both engine and transmission mounts together but it will not be healthy for them. Then there is 10mm difference in clamp bolt groove posiotion in TT center shaft. Thos 10mm is really only thing which needs to be changed. Its possible to do groove for clamp bolt on center shaft while shaft is in the tube. So change is not impossible.

Stan.Shaw@Excell.Net

I am a bit confused by this. Mark A. advised when I bought the GT transmission it would bolt in to my '80 Euro S chassis using the existing TT. He knows what transmission is in the car since it was rebuilt through 928 Intl and he has the records.

So does this mean the GT transmission will not bolt in to my '80 Euro S chassis with it's current TT?

Vilhuer

'80 Euro S uses always 05 and short TT, GT box will fit without problems.

Stan.Shaw@Excell.Net

Yes, you are right. My error. Mark's note was:
"I see the rebuilt trans we sent you is a 28:05 so it would use the same torque tube, shifter and cross member as the 80-95 cars."

Andrew Schauer

Erkka-
Thanks for the information. I thought I read in the service manuals that my car should have come with an 03 transmission, but it has a 92A VIN number, so according to you, the 05 currently in place is stock. Good to know.

Garth S

Interesting - by looking at the rear trans cover, my '80 appears to have an '03' version ( studs vs. bolts in the cover). With a manufacture date of 06/80, this car appears to be a very late 1980 .... and the VIN is 92 A08 115xx. Maybe the last '80
The WSM (30-01, 02) indicate that the last 1980s were made on 13 June, 1980 ... and the '05' trans was introduced with the 1981 models starting after that same date.

Vilhuer

You are probably right. I think I was looking for wrong info in PET. Should have realised even 9288.. VIN is wrong. Sorry for confusion Andrew.

Possibly some very late '80 MY use 05 already as there is TT and subframe listed for '80 05 in PET.

checkmate1996

Stan, so now I'm confused. Is the transmission you have a 28-05?

Stan.Shaw@Excell.Net

Yes Brad, it should be a 28-05. Sorry for the confusion. I will crawl under and check, but I presume Mark A's records would be correct

checkmate1996

Well if your transmission IS 28-05, that is what is on my car now. We might be back in business..