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Transmission Flange Questions


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Alright so the old 4 speed in my 1600 went out, and i picked up another 4 speed, because it was a good price. I'm now converting to the hydraulic pedal bucket and system, but my question is can the 3 bolt flange on my old transmission be switched out with the 4 bolt on my newer transmission?

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As long as they both have the same number of splines you should be OK. I am not familiar with 1600 transmissions (are they different than 2002). The other thing to check would be the overall depth. On 2002 and 320i transmissions some have coarse splines and some have fine splines. Best to just pull the flanges and compare spline count.

 

Fred '74tii & '69

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Coarse vs fine splines on 02 trannys:  Coarse splines were used up until sometime in early 1974.  There were some '73s that had poorly heat-treated output flanges that allowed the splines to wear away (happened to my Dec 72 production '73).  The fine splines last longer than the coarse splines. 

 

Chances are good that your '68 1600 has coarse splines, so you're gonna have to find a three ear output flange to match the corresponding flange on your driveshaft.  Might be hard to find if your new tranny has fine splines on the output shaft. 

 

I don't know if the 3 bolt flange from an E21 5 speed will work or fit...you may end up having to find another drive shaft.

 

cheers

mike

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