The spring is inside the driveshaft where it goes into the trans. Take tension off the spring for cable and if I remember correctly it will pop right out.

 

Top bolts are easier with engine/trans tilted and use an 18" extension and a 12", possibly with a swivel on the end.

 

I wrote you a step by step here.

https://www.opelgt.com/threads/any-good-write-up-or-video-of-replacing-a-clutch-in-a-%E2%80%9872-gt-with-a-1-9.116684/post-1509186

The spring is not inside the driveshaft. It is inside the transmission tail housing. If you’re missing it you will need one. OGTS makes them.

The top bolts can sometimes be reached with an impact and long extensions through the shifter hole in the body especially if you remove the trans mount and angle the engine and trans down on a jack. Otherwise cut down a cheap 15mm wrench and get them from the top. Cussing and a breaker bar is sometimes required.

 

Yes and thank you! I was unsure on the spring.

 

There was no spring in the drive shaft on my car.

 

I am still struggling. Got the transmission out and have gotten hung up on the bell housing. In the photo below you can see the extension accessing one of the two bolts at the top of it. Neither of these will break free. I’ve soaked it in PB blaster several cycle. Used and impact and no success. I have even used a block of wood with an air hammer to vibrate the bell housing.

How many bolts hold it to the engine? The one photo below, looking toward the front of the car the arrows point to 6 bolts. The Lower 4 are out. Are these 6 all that need to be removed for the bell housing to be removed? Do the bolts in the other two photos ( looking to the rear of the car) also need to be removed?

Thanks in advance.

 

Those bolts are sometimes absolute hell. You’re just going to have to get creative. You will likely have to find someway to get it with an impact wrench, or you’re going to have to loosen the motor mounts to get you some more drop. There’s a hundred things that may work to get those bolts broken free. The fun part is finding the one you can do with your tools!
Take a break and give it a try another day if you start getting frustrated. Oh and use anti sieze when you reassemble

You do not have to remove the bolt facing upward into the block. Remove all others.

 

For future reference, I've found, it's far easier to drop the engine and transmission, then do the clutch work, and replace the engine and transmission than it is to try to replace a clutch component with the engine staying in the car.

I only said "I've found" because there's usually a person or two that would say they've done it with the engine still in the car and it wasn't that bad.

I've done transmissions three ways. Engine in the car, engine and transmission pulled from the top. Engine and transmission dropped out the bottom.
The last method is the easiest.

 

So, just the ones circled in green on both side?