My 1970 911E has a broken tooth on its pinion gear. It runs, but makes a "p" sound under load, and this noise is getting louder. I need to rebuild the 901 transmission and replace the broken gear with new or used ring & pinion. I received quotations from $900 (used ring & pinion) to $3,500 (new ring & pinion), plus $300 to $600 for R&R.
I use my car as a daily driver, and a higher 5th gear will make those long highway cruises much more enjoyable. (Don't get me wrong, I like the sound of
911 air cool engines as much as anyone else, but my old ears would no longer tolerate this music for more than an hour at a time.)An alternative would be to upgrade to a 915 trans. I received one quote at $2,500 for conversion with used parts and a "refreshed" 915 trans.
What are your opinions on 915 conversion vs. 901 rebuild?
What engine rpm can I expect with an early (72 or 73) 915 trans at 60 mph? How about 915 trans from 74 thru 77 cars? How about 915 trans from SCs?
Is there any "how to" article or book on 901 to 915 transmission conversion with list of parts required?
Does anyone have a kit for this conversion?
Thanks,
Robin M. Hou