 how to identify if its a 914/6 gearbox? |
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| masriallan |
 May 14 2018, 10:16 AM
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#1
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Newbie  Group: Members Posts: 3 Joined: 12-April 18 From: Mexico City Member No.: 22,035 Region Association: South America  |
Hello
Is there any way to identify if its an 914/6 gearbox or a regular 914 gearbox?? Which would be the main differences?? Thanks for your help |
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| davep |
May 14 2018, 10:20 AM
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#2
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914 Historian Group: Benefactors Posts: 5,220 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
serial number and linkage in the end cap.
Serial # is a 75xyyyy where x is the year digit 0, 1, 2 and type # is 914/01 applies to five speed as opposed to the very rare Sportomatic bottom; notice no long cast extension for gearshift connection  side; notice pivot on intermediate plate for throttle  |
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| Dr Evil |
May 14 2018, 10:36 AM
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#3
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Send me your transmission! Group: Members Posts: 23,034 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
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The numbers are located here rather than on the spine.
Attached image(s)  
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| masriallan |
May 14 2018, 10:44 AM
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#4
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Newbie Group: Members Posts: 3 Joined: 12-April 18 From: Mexico City Member No.: 22,035 Region Association: South America |
QUOTE(Dr Evil @ May 14 2018, 11:36 AM)  The numbers are located here rather than on the spine. Will look for the numbers thanks for your help, regarding the gearbox are they any different or just the same gearbox with different numbers?? This is my car kardex currently restoring  |
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| davep |
May 14 2018, 11:01 AM
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#5
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914 Historian Group: Benefactors Posts: 5,220 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
The parts are a bit different. The main casting may be the same as 911 transmission from the same year, but different from the 914/4. You can see a protrusion on right side of case at the bottom of the bell housing that is not present on the 914/4. The intermediate plate is drilled for a pin acting as a shaft for throttle pivot. The rear casting is unique to 914/6
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| Dr Evil |
May 14 2018, 12:16 PM
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#6
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Send me your transmission! Group: Members Posts: 23,034 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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The boss in the intermediate plate for the throttle bell crank is present on many tail shifters, just not drilled. The tail cone is unique and not the same as a tail shift 914/4. The gears will be different from a 914/4 as well.
Stock 914/4 is A, F, N, V, ZD Stock 914/6 is A, GA, O, V, ZA Sometimes, the holes in the top of the bell housing are round (early model 911, 914/6, some earlier 914/4) instead of square (later models). |
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| Dr Evil |
May 14 2018, 12:18 PM
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#7
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Send me your transmission! Group: Members Posts: 23,034 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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QUOTE(masriallan @ May 14 2018, 12:44 PM) QUOTE(Dr Evil @ May 14 2018, 11:36 AM) The numbers are located here rather than on the spine. Will look for the numbers thanks for your help, regarding the gearbox are they any different or just the same gearbox with different numbers?? This is my car kardex currently restoring Your transmission # is 7502662, and is a /6 box. Cool piece of history. |
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| gandalf_025 |
May 14 2018, 01:03 PM
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#8
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Senior Member Group: Members Posts: 1,473 Joined: 25-June 09 From: North Shore, Massachusetts Member No.: 10,509 Region Association: North East States |
shift linkage on the end of transmission looks like the top picture
and the end of the shift rod looks like the bottom picture. Minus dirt and grease of course.  |
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| mepstein |
May 14 2018, 01:27 PM
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#9
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914-6 GT in waiting Group: Members Posts: 19,649 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(gandalf_025 @ May 14 2018, 03:03 PM) shift linkage on the end of transmission looks like the top picture and the end of the shift rod looks like the bottom picture. Minus dirt and grease of course. the shift rod under the car is different as well. |
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| gms |
May 14 2018, 05:37 PM
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#10
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Advanced Member Group: Members Posts: 2,708 Joined: 12-March 04 From: Chicagoland Member No.: 1,785 Region Association: Upper MidWest
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QUOTE(Dr Evil @ May 14 2018, 11:36 AM) The numbers are located here rather than on the spine. The serial number is on the spine of the early 1970 914/6 transmissions, the change occurred somewhere between car 300 and 400 |
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| oldie914 |
May 15 2018, 01:55 AM
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#11
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Member Group: Members Posts: 107 Joined: 2-May 10 From: Germany Member No.: 11,680 Region Association: None |
Your transmission was built using the same casting as for the 1970-71 911 and the part number on the casting should be 911xxxxx. The casting differences Porsche made for the 911 are more reinforcing ribs inside the bellhousing, the tab on the outside of the bellhousing used to hold the 911 pull clutch cable and the serial number pad on the bottom.
The machining differences between the cases used for the 911 and 914/6 were the different locations for the vent on the top of the case and the location for clutch fork pivot inside the bellhousing. For the cases used for 911s, a steel reinforcement strip was installed inside the differential carrier to take the force of the pull clutch. I have seen two 914/4 transmissions built with 911 cases. Probably done to use extra castings that were not needed for 911 production. |
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