Compiling 915 transmission gear ratio documentation

[thulsadoom]

Greetings. I have combed the bboard a bit and was not able to find complete documentation on 911 SC / Carrera gear ratios for the various years. Perhaps we can compile a complete chart here so that all the info is in one place.

Specifically, I'm looking for 1980 US (911/63) vs. 1984 US (911/68).

My starting point expanded by recent posts, still need more detail:
(damn newlines make life easier but add whitespace here!!)

Year	Model	Loc	Part #	Ratio	1st	2nd	3rd	4th	5th	Notes
1972-3	911 T/E/S	US	915/02	7:31	11/35	18/33	23/29	26/25	29/22	Magnesium
1972-3	911 Carrera	US	??	7:31	11/35	18/33	23/29	27/25	29/21	Magnesium
1974-77	911	US	915/43	7:31	11/35	18/33	23/29	26/25	29/21	Magnesium
1977	911S	RoW	915/60
1977	911 Carrera	US?	915/60
1977	911	US	915/61	7:31	11/35	18/33	23/29	26/26	28/23	asymmetrical dog/slider teeth, more robust silder hubs, first omega clutch assist spring, magnesium or selenium
1978-83	911SC	RoW	915/62	8:31	11/35	18/33	23/29	26/26	28/22
1978-??	911SC	US/Jpn	915/63	8:31	11/35	18/33	23/29	26/26	28/23	Omega springs needle bearings, casting Silumin
1978-79	911 SC	US/RoW	915/61	8:31	11/35	18/33	23/29	26/26	28/23	Aluminum (stronger, heavier)
1982-83	911 SC	US/Row	915/62	8:31	11/35	18/33	23/29	26/26	28/22
1980-83	911 SC	US/Jpn	915/63	8:31	11/35	18/32	23/29	26/26	28/23
1980-83	911 SC	US/Jpn	915/63	8:31	11/35	18/32	23/29	26/26	28/23
1978-83	911 SC	US	915/40-44-60-61	8:31	11/35	18/33	23/29	26/26	28/23
1980	911 SC	US	915/63	8:31	11/35	18/32	23/29	26/26	28/23
1984	911 SC	US	915/68	8:31	11/35	18/33	23/29	29/28	38/30
1984	911 SC	RoW	915/67	8:31	11/35	18/33	23/29	29/28	38/30
1984	911 SC	RoW	915/67	8:31	11/35	18/33	23/29	29/28	39/29
1984-86	911 Carrera	US	915/68-70-73	8:31	11/35	18/32	23/29	26/26	38/30
1984-86	911 Carrera	RoW	915/67-69-72	8:31	11/35	18/33	23/29	29/28	38/29

Also helpful to add brief comments like 'aluminum box starts this year, increased strength & weight'

I will compile all of it into a nice concise HTML table and repost when reasonably complete.

Thanks muchly!

[Bill Verburg]

If you don't have access to the shop manuals or spec books maybe start here at "Instant G" look towards the bottom of the page. Steve uses a non standard way to represent the ratios but it's preety good otherwise

also lots of info avaialble from 'search'

[Bill Verburg]

magnesium trans cases were used from '72 to '79 on E thru K series n/a cars
915/02 was the first version in '72 and 915/73 was the last version in '86, there were also several 4 speed versions