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I'm looking for information on the possibility of swapping a bellhousing from an AW-55 / BW-55 to a AW-70 / AW-71. I know that the bolt patterns for the engine-to-bellhousing are the same, however, I need to know if the bolt patterns on the bellhousing-to-transmission are the same.
You're probably wondering why I'm asking such an unusual question, and here's the reason why (and the backstory).
A friend of mine on this board is in the process of converting his 740 Turbo Diesel to veggi-oil (WVO), and thus providing him with "free" gas, thanks to the abundant supply of waste vegatable oil from all the fast food resturants. He was almost done with the conversion, when the stock ZF4HP22 transmission blew up (I won't go into the details, but it's a very common problem on the ZF trannies).
All of the Red-Block gas engines in our Volvos have the same bolt pattern for the bellhousings to mate up to. However, the diesel engines have a different bolt pattern and this is because the Diesel engines were made by VW and purchased by Volvo for their passenger cars (a true Volvo diesel is huge and commonly used in semi tractors and large earth-moving equipment, so they bought the small "automotive sized" diesels from VW and put them in the 240/740 vehicles). The VW diesels that were installed in the 240 vehicles came mated to an AW-55 transmission, which is the older 3-speed version (commonly found in the '76-'80 240s) of the more common AW-70 and AW-71 (4-speed) transmissions that most of us have in our gas 240s.
Over in the 700 series lineup, the 740/760 Turbo Diesels were fitted with either an M-46 manual transmission, or a ZF4HP22 (4-speed) automatic transmission. My friend would like to avoid replacing his toasted ZF tranny with another ZF, and would prefer to have one of the more "bullet-proof" AW-70 or AW-71 transmissions. I've given him an AW-71 transmission to use, but the bellhousing on it is for the regular Red-Block gas engines (B230/B23/B21/etc).
Fortunately, a Michigan farmer has donated a rusted out '84 240 Diesel to the project (equipped with the VW Diesel and an AW-55 transmission). Unfortunately, the car is so rusted out, it can not be jacked up to remove the transmission easily. All of the jack points, cradles, crossmembers, etc, are so weak that they can not hold the weight of the vehicle when jacking it up, and they crush inwards like cheap pie crust. Before the project continues (extracting the AW-55 from it's rusted coffin), we would like to confirm that the bellhousing in the 240 will properly mate the AW-71 to the VW diesel in the 740. The bolt pattern will match on the engine side of the bellhousing, but we want to be sure that the bolt pattern on the AW-55 and the AW-71 boxes are the same.
If you have any information, part numbers of the bellhousing needed to accomplish the task, or thoughts on this subject, please feel free to post.
Thanks and God bless,
Fitz Fitzgerald.
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'87 Blue 240 Wagon, 261k miles.
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