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Old 03-22-2016, 05:35 PM   #26
sbabbs
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Guy I got my m90 from told me they are the same as M56 transmissions and you could put the gears from the m56's in the m90's if you want. Not sure on that but if so then parts like syncros and bearings should be same then right?
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Old 03-24-2016, 09:01 AM   #27
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Most of the internals are the same, i used a syncro from an m56 when I broke the m90 third gear syncro. Just be sure to get the right type, m90's first came with single syncros and later three piece syncros.




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Old 03-24-2016, 09:05 AM   #28
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Do Volvo sell internal parts for the M56 `box? Thanks.
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Old 03-24-2016, 10:10 AM   #29
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Quote:
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Do Volvo sell internal parts for the M56 `box? Thanks.
no
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Old 04-10-2016, 12:14 AM   #30
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I figured why not have a pro welder weld it. Pics maybe video probabbsly showing how to take it apart coming or is it put it back together. Basically if you want to take it all the way out you gotta take out all the bolts out from the front of it, then there is a snap ring you gotta take out, then all the guts will fall out if you turn it upside down. Sort of how I did it.. That is the input shaft Eric is holding there in the pic above. Also the turd gear stop ring weld shaft. Same thing. Don't forget to take that bolt goes into shift rod in trans and drop out ball bearing first...

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Last edited by sbabbs; 08-07-2017 at 03:37 PM..
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Old 11-09-2017, 07:04 PM   #31
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Anyone has any info about setting up coutershaft axial clearances in these boxes? Just by curiosity...
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Old 11-09-2017, 08:00 PM   #32
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Anyone has any info about setting up coutershaft axial clearances in these boxes? Just by curiosity...
Oh well, it probably has a small preload, but how much, and where are the shims placed?
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Old 12-01-2017, 10:36 AM   #33
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Thanks to all the fine folks that posted here. You are a big help to me on my 740 Turbo cheapo endurance racing car, the Happy Moose Racing sedan. I have an M90 in it, sourced from a friend in UK, but I did not do the weld upgrade...yet. Seems a big job, but smart to protect my rare bird tranny. Even got lucky on the ratios, it is the closer ones, whew. No, we didn't know beforehand, he just had one and sent it, boom.
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