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I bought a 915 a couple of years ago to use with my type 4 but sold it when I realized the clutch setup alone would cost $500 and the 930 CVs/axles/stub axles was another $500 on top of the $800 I spent on the trans. Big $$ but bullet proof, certainly not necessary for my little 125hp!
I then bought a 902 from a '69 912 for $200, just like a 901 but with slightly different gear ratios. I thought it would have type 1/901/914 size drive flanges but it also had 930 size flanges! I picked up a pair of 914 flanges and I'm back in business. My 914 clutch/flywheel/release bearing work well. The 915 included a Porsche starter so I kept that too.
The reference chigger made to the clutch actuation can get confusing, VW's/914/901 use a push type clutch- that is the release bearing pushes on the pressure plate to release the clutch disk. 915 trans use a pull type clutch-the release bearing is attached to the pressure plate and the arm pulls release bearing that pulls the pressure plate to release the clutch disk. These references have nothing to do with the clutch arm and the way the cable acts on the arm. Now to confuse things more, I understand the 912E used a 923(?) trans that is like the 915 but uses a 914 style clutch (push). Pretty rare and I have not seen one in person.
I did some careful measurements and found my 914 clutch/flywheel would not work in my 915 trans. It would require a custom flywheel from Kennedy eng. I have heard that someone converted a 915 to use a 901 clutch arm but I don't remember who.
We still haven't talked about the 911/01 trans, it's a mix of the 901 and 915 for '70-'71 only. As I understand it, it's a 915 with a 901 bellhousing so it's a good way to go but much harder to find.
So, to answer some of your questions: 901 trans sell for $200-$1000 depending on condition and your luck. I was very lucky. 915 trans sell for much more- $600-$2000 depending on condition. What to look for? Well, be sure you know what drive flange size you are getting so you know how expensive the rest of the parts will be. Check the oil for metal and hope for the best.
ken
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