hi I am peter from Australian 4 speed specialists we also put a spiral on the main shaft as well and we use the Mitsubishi C3 hi clearance doubble sealed bearings used in their 4 wheel drives with a rev range of 9000 revs need to know more just ask me

Quote Originally Posted by No van man View Post
Has anyone had a 4 speed rebuilt, strengthened from Australian 4 Speed Specialists?
They sell upgraded M20/21's up to approx. 200kw for around $2000.
http://www.hotfrog.com.au/Companies/...cialists-35856

Gaz.