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Old 07-22-2010, 10:02 PM   #1
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Join Date: Jan 2009
Default AW-70 to AW-72 Swap: Possible in Earlier Cable-Speedo Cars?

I am in the continual process of improving my '84 245 and now I am looking at transmission options. I have the stock AW-70 in the car now and it does alright, but it leaks fluid badly and sometimes has a hard 1-2 shift at parking lot speeds. I got a quote from a reputable transmission shop for about $275 to repair all the leaks and flush the transmission. Not too bad in my opinion, but I still wonder about the 1-2 shift quality.
Today , I went to the local salvage yard and was looking at a '93 940 with an automatic transmission. The car was totaled when the passenger side front suspension collapsed at speed and crumpled into the footwell. I looked at the VIN plate and found this car has a lock-up AW transmission (code 6). Further research shows it has a AW-72, which has been recommended by members of this board for swapping into a 240.
Will this work on an earlier car that needs the extension housing for the speedometer cable drive? I have heard the extension housings are swappable from AW-70->71, but will they swap from 70/71 -> 72? Can the speedometer drive gear be driven onto the output shaft of an AW-72 transmission? Has anyone done this before?

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