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Old 04-16-2017, 08:52 AM   #1
bugjam1999
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Default Calling Captain bondo - m90 gearbox mount

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
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Old 04-16-2017, 10:40 AM   #2
Wagner
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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?







It would not be free, but it would not be expensive either. Postage might be though.
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Old 04-16-2017, 10:41 AM   #3
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^^ That is really cool.

Last edited by Tfrasca; 04-17-2017 at 10:21 AM..
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Old 04-16-2017, 10:49 AM   #4
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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
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Old 04-16-2017, 11:52 AM   #5
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I'm in Europe as well. I'll send you a PM when i get home.
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Old 04-17-2017, 05:15 AM   #6
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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.
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Old 04-17-2017, 10:28 AM   #7
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Quote:
Originally Posted by crogthomas View Post
The difference in length between a M47 and a M90 is ~45mm..
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.
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Old 04-17-2017, 10:49 AM   #8
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http://www.retroturbo.com/?product=e...for-200-series
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Old 04-17-2017, 10:49 AM   #9
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http://www.retroturbo.com/?product=v...lvo-200-series
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Old 04-17-2017, 10:49 AM   #10
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look at both of those.
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Old 04-17-2017, 04:13 PM   #11
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Quote:
Originally Posted by Wagner View Post
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.
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Old 04-17-2017, 05:29 PM   #12
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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
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Old 04-18-2017, 12:13 PM   #13
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Quote:
Originally Posted by crogthomas View Post
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.
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Old 04-25-2017, 02:36 PM   #14
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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.
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Old 04-26-2017, 09:07 AM   #15
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Snap this piece out of a 940 mount




Cut from the 240 one also and test fit parts


Weld and paint


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.
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Old 04-26-2017, 02:42 PM   #16
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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.
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Old 04-26-2017, 03:55 PM   #17
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Quote:
Originally Posted by Wagner View Post
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.

Quote:
Originally Posted by sbabbs View Post
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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Old 04-26-2017, 04:38 PM   #18
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I got the retro turbo m90 mount, bottom one in the pic. Like stock but stiffer. I could do that mod the 240 trans crossmember to fit 940 mount.

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Old 04-27-2017, 09:22 AM   #19
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This is perfect! Can I get in on this?
I'm in the UK too
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Old 04-27-2017, 09:40 AM   #20
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Quote:
Originally Posted by Wagner View Post
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.
Pm'd you bud!
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Old 04-27-2017, 03:23 PM   #21
bugjam1999
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Interested re: the length of the 740 propshaft, I was lead to believe that the 240 one had to be lengthened as nothing stock was the correct length. Perhaps I'll get the m90 in place and measure things, then go junkyard shopping...
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Old 04-27-2017, 03:27 PM   #22
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On my car I used 740 M47 front piece.

The M90 is 50 mm shorter than the M47, as stated by Wagner.

I recall from memory that the driveshaft length differs 80mm between 240 and 740, when it has identical transmission installed (talking redblocks here!).

With my math a 740 M47 DS has to be shortened by 30mm.

Thats what I did. Shortening is easy, had it done by a shop last time, now I'd do it myself.
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Old 04-27-2017, 04:59 PM   #23
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Quote:
Originally Posted by JW240 View Post
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.
Do you remember which bit it was?
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Old 04-27-2017, 05:01 PM   #24
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Quote:
Originally Posted by crogthomas View Post
Do you remember which bit it was?
I'll take a look and pic in the next days, car is on the lift for rear axle swap anyway!
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Old 04-27-2017, 05:01 PM   #25
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Quote:
Originally Posted by JW240 View Post
On my car I used 740 M47 front piece.

The M90 is 50 mm shorter than the M47, as stated by Wagner.

I recall from memory that the driveshaft length differs 80mm between 240 and 740, when it has identical transmission installed (talking redblocks here!).

With my math a 740 M47 DS has to be shortened by 30mm.

Thats what I did. Shortening is easy, had it done by a shop last time, now I'd do it myself.
I suppose if you're shortening it anyway you may as well use the 940 shaft that was fitted to the M90 in the donor vehicle. Perhaps keep the whole shaft to benefit from the better centre bearing (with suitable modifications to fit the bearing to the chassis).
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