901 Trans. questions,Please.
 

I've been lurking here for a few weeks and this board seems very informative.My question
is I just purchased a Porsche trans. Stamped on the bottom is 911/01 and 7700103 also on the cover over the shifter shaft is marked
901.301.301.1R I'm been told it is a 5-speed
around 1971 vintage and has first gear in top left position.Can anyone help me confirm this. Many Thanks in advance!

Top left is the normal position for first gear in a five speed, with the configuration looking like: 1-3-5
2-4

Top left is the normal position for first gear in a five speed, with the configuration looking like: 1-3-5
---------------2-4

Steve,

That is a 1970 model '911' variant of the five-speed 901 trans, the last producted for the 2.2 engine, and designed for the later 'pull-type' clutch and flat flywheel. The ratios equipped were: 11:34 (3.091), 18:32 (1.778), 23:28 (1.217), 27:25 (0.926), 29:22 (0.759) ... and the ring & pinion was 7:31 (4.429)

You have been misinformed about the shift pattern ... it is the same as all 914's: R-2-4 across the top, 1-3-5 at the bottom row!!! The 1-2 shift is a bit 'tricky' as a pause and dogleg motion is needed to avoid 'nicking' reverse! This is called the 'road racing pattern' among Europeans, because 1st gear is not considered as important as 2nd-5th. Cosequently, 1st and Reverse have a heavy spring-load to overcome, and the 2nd thru 5th are in the traditional 'H-pattern.'

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Warren Hall
1973 911S Targa

Early 911s had four and five speeds. Up till 1972 the five speed had first gear like the 914. Reverse at the top of the "H" with first over to the left and back.

In 73 the 901 trans was reconfigured for the 911 to have first at the top of the "H" with reverse all the way over to the right below fifth. The 914, 901 trans kept the old style shift pattern. The 901 trans in the 914 is the same with different numbers and flipped ring gear....

I don't have my book in front of me. But you will need to look up the trans number to see what year it is.

oops, Warren beat me to post by 2 minutes...

Hey,you guys are fast! Thanks very much.O.K. now the T/B fork issue.. is that going to hurt me when I install it in my 1967 912(sorry, thats all I could afford)when I bolt up either a built VW or 914 or a 912 motor and can the hubs on the diff are slightly larger O.D..... can they be swapped out for the 912 axle pattern and last but not least
I bought it rebuilt for $500 guarented,how did I do? Early_S_Man , you are correct about the shift pattern, I mis-understood the gentleman I purchased it from. Thanks again and I hope I didn't buy my self a lot of trouble.

Steve,

I suspect you may want to sell that transaxle as a rebuilt unit, you could very easily make $300-$500 on such a sale!

The biggest issue is coming up with a flywheel and clutch for a 912 or VW engine that would work. I haven't looked closely at my service manual to see if it is possible to convert the 911-style transaxle back to the 901-style clutch or not. Definitely a thorny issue there!!! The pull-type clutch is quite an entirely different linkage at the transaxle, compared to the older VW-style push-type clutch!

I don't know if the CV-joint flanges will interchange or not. You could easily remove one from each transaxle and compare! But, you should deal with

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Warren Hall
1973 911S Targa

http://www.kennedyeng.com/
These guys can make a conversion flywheel for any VW/Porsche combination. I used them for my 3.0 914/6 conversion flywheel and clutch package...