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Join Date: May 2013
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1988 911: do I have a G50 or 915 transmission

From the PP technical section;

The 901 transmission requires a 17mm hex key to remove the M25x1.5 plug. On the 915 transmission, used on 911s from 1972 through 1986, the plug is the same, but located on the bottom of the transmission instead of the side. With the G50 transmission, used on 911s from 1987 on, the locations of the plugs were similar to those on the 915, but the plug type changed from requiring a large hex key to requiring only a 19mm socket.

When I changed my gear oil today I had hex head plugs and drain plug was onthe bottom. Does this mean I have a 915 instead of a G50? Would a previous owner have swapped transmissions (can the be swapped)?
Old 05-30-2013, 06:18 PM
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If it's an 88 then you got a G50. More than likely someone changed the plugs during the life of the car. I have an 86 with a 915 Transmission and I've got the 19mm plugs. Maybe I took yours and swapped them with mine. The 19mm plug is easier to work with.
Old 05-30-2013, 06:34 PM
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Must be a G50. What is your shift pattern? If Reverse is on your LEFT FORWARD beside 1st gear its G50 if its RIGHTMOST BACKWARD beside 4th gear its a 915.




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Last edited by JQ911; 05-30-2013 at 06:52 PM..
Old 05-30-2013, 06:43 PM
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If it has a hydraulic clutch it is the G50. The size/style of drain plugs is not an accurate indicator.
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Old 05-30-2013, 06:56 PM
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Quote:
Originally Posted by JQ911 View Post
Must be a G50. What is your shift pattern? If Reverse is on your LEFT FORWARD beside 1st gear its G50 if its RIGHTMOST BACKWARD beside 4th gear its a 915.




Left forward for reverse - good to know its a G50
Old 05-30-2013, 07:11 PM
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