Would the 240 transmission crossmember be different for an auto, m47 , m46? Planning an auto to m46 conversion and have a few questions to resolve. Deceided to post the questions one at a time. thanks
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways

This probably doesn't make any difference in your case but I found that when I swapped from auto to M46 in our 83 Turbo the crossmembers were the same...

Justin B.

that's interesting. maybe the auto and m46 are the same but the m47 different or maybe its just on the older years that the m46 and auto are the same. trying to sort out my parts list and keep getting confused. thats why i'am trying to attack one item at a time.
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways

You would probably be better off finding a 240 donor with all the parts. If you collect all the parts separately you will probably end up paying more. I negotiated for all the parts I would need when I went from m47 to m46. I got mine for 150 bucks Canadian with the shifter, wiring harness, and driveshaft. The only thing I did not get the first time was the crossmember because I thought it was the same. I then ended up paying an extra 40 bucks for the right crossmember.
I am not sure about the auto crossmember, but the differences are subtle. You would have to put them all side by side to know for sure. But as I said you could probably make any of them work if you messed around with spacers.
Most of the M46 equipped 240s also have rectangular spacers between the crossmember and the frame. These are important to get the right clearance. The M47 crossmember does not have these.

Yes different crossmembers for all trannies. The M47 crossmember will work with an M46 with clearance issues. If you messed with washers you could probably solve them. I tried using a m47 crossmember with an M46 and the gearbox sat up too high causing vibrations. I solved this by getting the right crossmember and mount (m47 is rectangualr and m46 is round), but with some messing around I could have probably used the M47 parts.

Thanks for the response. My tranny is from a 1989 740 turbo. Would any crossmember from a m46 equiped 240 work? Just wondering if all m46's are basically the same.
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways

You are also going to need shift linkage from an M46 equipped 240, along with the driveshaft, and transmission output flange.

You will also need the 240 flywheel, clutch assembly, throwout arm, and clutch cable. The pivot point for the throwout arm will need to be moved, and you should change the ball stud to the correct 240 version. Use an OEM clutch cable. I have found the aftermarket ones give high pedal effort. A Sachs clutch kit will be fine on a freshly surfaced 240 flywheel. The flywheel you get will need to have the correct hole count for the fuel system on the car you have, and it will need to be indexed correctly. Don't forget to install a pilot bearing.

Don't forget the OD relay and wiring.

Your AW71L equipped car probably has a rear differential ratio of 3.91:1 or 3.73:1. M46 equipped NA cars had a rear differential ratio of 3.31:1.

The M46 from a 1989 740 turbo will have a P type overdrive, instead of the J type. It should outlast the rest of the car. M46s from from the late 70s had a different input spline, but the one on your 1989 740T M46 matches those for all 240s from 1979 on.

The 700 series uses a different transmission mount bracket which bolts to the transmission. Once again, you will need the proper 240 part.

The
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john

John,
thanks for the detailed response. it sounds like you got a bit of experience on this type. the parts list can be quite confusing and I was trying to attack it one item at a time crossmember first. jbowser did a conversion on a 1983 and indicated the the auto and m46 crossmembers where the same. Is this the same for my 1990? On the shifter will I need the shifter cage and linkage or just the linkage? Both my 1990 Sedan and the 1989 740 Turbo donor are LH2.4. doesn't this make the flywheel compatable? the 740 has a hydraulic clutch setup that I'm hoping to use. is the tranmission mount bracket your refering to the rubber tranny mounts that sell for around $10. is any part of the 740 driveshaft useable. Sorry about so many questions but i'm still very sketchy on my parts list.



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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways

I can't answer about the crossmember, but I suspect they are the same, just mounted to different points in the unibody.

The shifter "cage" is different. The 740 shifter is about 4" further back. You need 240 shift linkage, complete.

Yes, the flywheel will be compatible. The 740 hydraulic clutch will be a chore to adapt as there are no factory parts for a 240 hydraulic clutch. I would use the stock 240 cable actuated clutch and throwout arm.

The transmission mount bracket I am referring to is the part which bolts to the transmission. The round rubber mount bolts to it. You will need the 240 transmissionn mount bracket.

In order to use the 740 driveshaft you are going to spend some money at a driveshaft shop. A 240 driveshaft will bolt in, but you'll need to change the output flange on the OD. They are sealed (loctite) to the output drive shaft and you'll need a beefy puller to remove it after you take the large nut off. If you need a 240 output flange, I have one that you can have for the postage.
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john

John,

Might be starting to sort all this out. The 2 things I know for sure that I need are clutch/brake pedals and shifter cage/linkage. the crossmember and transmission mount I might sort out when everything is out. When I tested the 740 the hydraulic clutch felt really nice. I pulled everything off the 740(hose,cylinder,brake reservior) and it looked straight forward and my m46 clutch is allready setup this way. The driveshaft it sounds like I should go with a 240 one with 240 flange. Wonder why Volvo chose to use different flanges on 740/240. Thanks for the flange offer. Dpending how things turn out I might take your offer on this.
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1990 240 Sdn 277K,tach,strut brace,turbo sway 1990 240 Wgn M47II 157K,tach,strut brace,poly bushings,IPD sways