I have Bren's old PPG gearbox for sale, unfortunately I broke third gear after a few months. Selling due to power upgrade and not interesting for me invest in the rebuild:
Damaged PPG 1-4 helical dog (drift) set. 3th gear broken. Can be rebuilt or used on smaller drift track as 1,2,4,5 gears are still fine. First gear is quite long at +-52mph :-)
Parts are normally still available at PPG. Rebuilt cost for third gear was £1200(includes lower shaft) few yeas ago.
Fit's CA or SR bell housing and is really fun to drive. Clutch-less shifting withe the Dog-box (like a motorcycle) with almost zero turbo lag is quite addicting :-)
Cost new £4500. Bottom 3 parts: billet shaft, billet forks and 1-4 helical dog drift set:
http://www.ppgearbox...p?categoryid=13
Broken gear pics:
http://s1252.photobu...l/slideshow/PPG
£900