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Calling Captain bondo - m90 gearbox mount

bugjam1999

Member
Joined
Aug 18, 2015
Hi - I'm working towards an m90 swap, one of the last pieces of the puzzle is the gearbox mount. I've seen two styles in pictures, a 940 gearbox mount welded into the top of an m47 gearbox crossmember and the so called captain bondo style mount which bolts onto the m47 gearbox cross member without modifying it.

Is the captain bondo style mount available to buy? Or if not are the specs/measurements of it available?

Thanks :)
 
Hello.

Where in the world are you?
Can you weld regular steel?
Are you at all interested in a do-it-yourself -solution, if the parts were pre-made?

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It would not be free, but it would not be expensive either. Postage might be though.
 
That is very cool and I'd be very interested.

I'm in the U.K., but my girlfriend is visiting her parents in Chicago from the 26th to the 30th of this month and I'm sure she'd just love to bring something volvo related back with her. Alternatively flat rate ups boxes aren't that bad.

Do you have those kits ready to go?

Cheers
 
Assuming this is for a 240, there are three ways I?ve seen this done:

1) Use the M90 bracket and rubber mount with the 240 cross-member modified to take the rubber mount. This is not the best solution as the engine mounts on a 240 are angled which puts a lot of shear force on the m90 rubber mount that it was not designed for.

2) Use a rectangular box section to space out the rear of the M90 gearbox to use the 240 angled bracket and rubber mount. The difference in length between a M47 and a M90 is ~45mm. This is probably the simplest to make, but bulky and finding the material in the right dimensions is remarkably difficult.

3) Fabricate an angled bracket to take the 240 rubber mount directly. I was just designing one of these myself to be laser cut, but I see that Wagner has done a much better job than I could have. Good work. This is definitely the best way to do the job.
 
For what it's worth, the difference in lenght is 50mm between M47 and M90. Just correcting it if someone sometime in the future googles for that.

Sort of.

The difference in length to the output flange of the box is 50mm. The M90 is shorter. So this is the length you need to add to your 240/M47 propshaft to make it reach the gearbox. The spacer linked by Idealgaslaw is the simple way of doing that.

The difference in length to the mounting face for the mount bracket is ~45mm. The M90 is 438mm from bellhousing face to bracket poistion, the M47 484mm. This is the length you need to add to the rear of the M90 to allow you to fit the standard 240/M47 gearbox rubber mount and bracket. Or just shrug your shoulders and use the closest available stock size (50mm).

That said, your solution is much more elegant.
 
Thanks all- I've been in contact with Wagner and have purchased one of his diy mount kits which looks great. As detailed above, this seems to be the best design of solution.

I'm not keen on the spacer idea, I'm going to have the propshaft lengthened and rebalanced- this is relatively simple and helped by me not needing the car daily, so I can measure and then send the propshaft off to be modified etc.

Cheers
 
Sort of.

The difference in length to the output flange of the box is 50mm. The M90 is shorter. So this is the length you need to add to your 240/M47 propshaft to make it reach the gearbox. The spacer linked by Idealgaslaw is the simple way of doing that.

The difference in length to the mounting face for the mount bracket is ~45mm. The M90 is 438mm from bellhousing face to bracket poistion, the M47 484mm. This is the length you need to add to the rear of the M90 to allow you to fit the standard 240/M47 gearbox rubber mount and bracket. Or just shrug your shoulders and use the closest available stock size (50mm).

That said, your solution is much more elegant.

Oh, ok. Didn't know that. Never looked into the box section thing. Just saw the length difference mentioned.

Hot tip for those using the M90: replace the Volvo guibo with a BMW E34 M5 guibo (flex disc). It is 5mm thicker and supposedly stronger than the original one. Bolt circle is the same. With that one you naturally extend the driveshaft less than with the stock one, 45mm.

Part number is 26112226527. Price for an OEM one is around 100 euros.

Apparently also used in BMW E46 M3 and in the BMW Z3M -cars.
 
Glad you found a solution, I'm not around much ;-)

Anything that uses a round mount with a centered stud sticking out the center of each side is a good solution Imo, since you can always find thicker/thinner /harder/softer mounts with that general shape.

I think I actually used a diesel motor mount in mine Becuase I had it laying around. I used an m5 guibo as well. I can't recall what I ended up doing driveshaft wise. I actually think I got away with a stock one, since while the transmission is shorter, in my case I had the white block mounted as far rearward as possible which cancelled out some or maybe all of the length difference. So not much help there but glad you have it sorted! The m90 is a great transmission.
 
Snap this piece out of a 940 mount

20141231_213909_zps2c3c2e5c.jpg



Cut from the 240 one also and test fit parts
20150101_001326_zpse39d8182.jpg


Weld and paint
20150101_012645_zps0dbbdd60.jpg


M47 drive shaft from a 740 is a pretty close to a bolt-on fit. Cant remember since I swapped mine a couple years ago.
 
What about the shifter bracket and shift arm? Did you cut some out and reweld both so the 940 M90 redblock 5 speed fits in the old junker 240? What about the tunnel, do you have to beat on your old junker 240 tunnel to make the m90 fit or not? I'm thinking I might put this spare m90 in my 77 242 if it fits without having to beat on my old 240 more then I want to.
 
Awesome mount/pictures

Way cool, super nice design!!


First I used the M90/AW7X rubber mount from the 940. Seemed to me it didnt work correctly due to the angled (backwards) engine mounts. Trans seemed to sag to the rear slightly.
I used some leftover piece of box-section. Was easy to adapt, the size I used combined with the M47 mount/holder and some industrial rubber mounts was spot on.

What about the shifter bracket and shift arm? Did you cut some out and reweld both so the 940 M90 redblock 5 speed fits in the old junker 240? What about the tunnel, do you have to beat on your old junker 240 tunnel to make the m90 fit or not? I'm thinking I might put this spare m90 in my 77 242 if it fits without having to beat on my old 240 more then I want to.

On my 1991 240 the M90 fits fine. It rubbed a bit on a cast boss of the transmission but that one was easy to grind off. Probably a remaining of casting sprue. No function.

I shortened the M90 stuff and used the 940 shifter with better sound insulation etc.
 
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