Transmission ID

Hi guys – was hoping that I could get some assistance in identifying the gear ratios in my transmission. After searching the topic in the archives it appears the cases were stamped 901/xx to designate the type – whilst the only markings I have found other than the part # (901.301.101.OR) is a stamping of 7/66. Any thoughts?

Regards,

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Paul
911T'69

Paul,

The serial number and type number should be stamped on the bottom rib, and assuming you have a five-speed, from the spec book, it could be 901/07 or 901/13, which both had the same gearsets: 4.429 (7:31) ring & pinion, and 1st - 3.091
(11:34); 2nd - 1.889 (18:34); 3rd - 1.318 (22:29); 4th - 1.040 (25:26); 5th - 0.793 (29:23)

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Warren Hall
1973 911S Targa

Paul,
The data I've found in Peter Morgan's book "Original Porsche 911" differ somewhat:
The 901/13 belongs to a 911 2.0S, the 901/07 to a '69 2.0E.
If your car is a US 2.0, it should have a 901/12 gearbox. A euro 69 911 T 2.0 should have a 901/06 box.
I couldn't find gear ratios, though.
The 7/66 number should be a date of the box case build date.
I wish I knew the truth...
GeorgeK

[This message has been edited by GeorgeK (edited 01-14-2001).]

George and Paul,

The 911T had the four-speed 901/06 and 901/12 transaxles as 'standard equipment,' but I believe Paul has a five-speed. That is why it is important to find the type number to clear up confusion.

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Warren Hall
1973 911S Targa

Thanks for the feed back guys, I obviously did not look hard enough so I’ll have another go at it tonight and see if I can find the id #. Warren you are right the box is a 5 speed.

I will probably have to replace the clutch later in the year (starting to make slipping noises – juddering slightly in reverse, smelling and is correctly adjusted) so while the whole lot is out of the car I am interested in changing out 5th gear for something that will give my car slightly longer legs. I would appreciate any thoughts on the practicality of this.

Another quick question… I will be attempting a break upgrade and calliper rebuild later in the year (vented rotors, ‘A’ callipers up front) and am turning my mind to collecting necessary parts and getting familiar with the job ahead. What is involved in changing the rotors? In searching the archives I didn’t find any reference to a procedure.

Regards,


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Paul
911T'69

[This message has been edited by Paul W (edited 01-15-2001).]

Paul,

As far as the brake upgrade goes, there's not much to it! You will, of course, have to change the front struts, and depending on just how much comes with the struts, just unbolt five M8 bolts, take off the old rotor, put the new one on, transfer the hub/rotor assembly to the new strut (if it doesn't already have hubs and rotors) ... install the rebuild 'A' calipers, and change out the new struts for the old ones! Changing the struts will be the biggest part of the project!

As far as taller gears, why don't you find a used 914 transaxle, and take out both 4th and 5th gearsets ... and put those in your 901 trans as part of a rebuild/refresh? The 4-banger 914s were geared taller because of the limited rev range of the VW Type 4 engine.

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Warren Hall
1973 911S Targa