915/40 gear ratio

[Beetspeed]

Hello,

Does anybody know of a list of the existing 915 types against the stock gear ratios used?

I have a 915/40 tranny (mag case from a 2.7 ltr 1976) and would like to know the stock ratios and ring/pinion in there.

With seach, I couldn't find that info.

Thanks in advance,
Walter

[Grady Clay]

Walter,

Welcome to the Forum.

A 915/40 is a 1975 5-speed 911S, 911S/C (USA). If as originally delivered its gearing is:
1st – 11:35
2nd – 18:33
3rd – 23:29
4th – 26:26
5th – 28:23
R&P – 8:31

It should have a serial number in the form:
715XXXX starting with 7150001

Best,
Grady

[Bill Verburg]

'76 US 2.7 911 used a 915/44[list=1][*]11/35[*]18/33[*]23/29[*]26/26[*]28/23[/list=1]

w/an 8:31 r/p electric spoeedo

[Beetspeed]

Thanks guys,
You rock!

Most of the serial number has been grinded off from shoving the case around the garage floor, but the type number should be conclusive enough I guess.

Tnx,
Walter