DG84S

I'm guessing the left front caught a telephone pole, which sheared off and landed across the roof. Ouch!!

MetalSolid

Drewster67, nice avatar...

slate blue

Hi Peter, the driveshaft lengths are different. You may need the driveshafts too as the GTs driveshafts are shorter than your early model. The GTs driveshafts may go straight in but depending what year it is, I think they changed in 1990. The amount of splines may be different.

As to the wreck yes these cars are strong, I have cut two 928 s up so far and can testify to the heavy guage of the steel. I have a picture whick I just took on the weekend that beats that wreck any day. It's a 928 doing an impersonation of a banana. I didn't think it was possible. But if you hit something hard enough I suppose.

Peter F

Hi Greg,

thanks for heads up on the shafts.


/Peter

John Veninger

Sorry Greg, but your wrong.
The drive shaft is only different in 78 and 79 when they used the 03 boxes. From 1980 (w/ the 05 box) the drive shaft is the same for all 5 speeds. Mark Anderson stated this earlier.
I have an 89 transmission in my 80 track car along with the 80 torque tube. Direct bolt in as Mark stated.

Jim bailey - 928 International

Greg was referring to the axles / half shafts not the central tube / torque tube BUT I think he is still wrong ......... I think it may need different lenght C V joint bolts but as you say John you have one in your car !! which axles half shafts did you use ??

John Veninger

The 1980 ones.

slate blue

Hi Guys I can't be wrong I'm never wrong, just ask anybody who knows me!

John Veninger wrote

"Sorry Greg, but your wrong.
The drive shaft is only different in 78 and 79 when they used the 03 boxes. From 1980 (w/ the 05 box) the drive shaft is the same for all 5 speeds. Mark Anderson stated this earlier.
I have an 89 transmission in my 80 track car along with the 80 torque tube. Direct bolt in as Mark stated."

Jim Bailey wrote

"Greg was referring to the axles / half shafts not the central tube / torque tube BUT I think he is still wrong ......... I think it may need different lenght C V joint bolts but as you say John you have one in your car !! which axles half shafts did you use ??"

Sorry Guys, here's the Gospel according Porsche





Anyway Jim it's good to know I knew something that you didn't, I didn't think that day would come!

John Veninger

My old style shafts bolted up to the "new" transmission just fine. Looks like the bolt length change is due to the thickness of the joint and not the flange on the transmission.
I don't remember an issue with the old style CV joint gasket end mating to the newer flange.... to long also.

Maybe I should change to the newer style shafts to save weight, I can use shorter (lighter) bolts

slate blue

Hi John I think the point you need to address or at least think about is the fact that the later shafts are shorter. This means that your shafts have travelled on the internal spine 12mm already in the rest position for your suspension.

What this might mean to you is that your suspension may not have its full travel due to the shaft bottoming out at its limit position. Because your current shafts are longer when you hit a bump if the shaft bottomed out it would literally load the side of the transmission. I wouldn't think that would be too good. What might be saving you is that you probably have a pretty heavy duty suspension in the car and as such the times that the suspension would come under full compression are seldom.

John Veninger

Hi Greg,

I have a very stiff suspension in the track car. Running 400lbs hypercoils in the rear with a lowered ride height.
There must be enough shaft for my application since it has worked over the past two years with several races and many DE's.

I'm going to do some measuring between my track car and my GT this weekend to see the differences. The Porsche Tech Bulletin states the joint is shorter,but doesn't mention any changes in the overall shaft length.

Thanks for the information.

Jim bailey - 928 International

Greg the difference is ONLY the width of the CV joint the two different trans flanges are the same length . Again the only real significant difference is the length of the bolts and the elimination of the paper gasket . The overall length of the two axles including C V joints is the same .........

Peter F

Great stuff from all of you, thanks for all the details!
Would it be correct to skip the paper gasket if I use my old shafts with the newer gearbox?
Also wonder if I need to drop the entire rear suspension to swap the box?
Or can it be pulled anyway?
Already have the shafts repacked and still on the floor, same with the rear shocks due to Bilstein/Eibach upgrade.

/Peter

slate blue

Guess I will have to wait a bit longer before I can say what I said in that previous post. Now what did I say again? D'UH!

heinrich

Aww crap, you mean I missed the chance to be wrong?? I need to be more up on these posts ... I think I've been far more wrong than you Greg. I do know better than to contradict Jim though The man is like ZZ Top crossed with Yoda <chill>