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Old 10-30-2016, 12:45 AM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
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Default M21 rebuild questions.

I just noticed yesterday what seems to me to be excessive slop/backlash in the transmission. With the rear tires off the ground, if I put the thing in first or second gear (didn't think to try this on the other two gears) it just seems like I can twist the driveshaft back and forth an excessive amount of degrees rotation. There's also an audible clunk coming out of the case when it hits the end of the rotation slop. The transmission only has about 58k miles on it (it sat on the shelf for years while I was running the DN5spd), so I didn't think it would give me indications of needed repair. Questions:

How much rotational slop is "common"?

How do you take the slop out? These antique boxes don't have individually removable gears like my 5 speed, and I'm under the impression that the cluster gears are damn expensive.

Educate me a bit here. Thanks.
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Old 10-31-2016, 10:51 AM
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M22 is under $2000. You've got a BB, your old transmission is probably seen better days.

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Just the gears
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I think I paid $1700 10 years ago for an m22. No issues.

Since you are concerned about weight, you might want to rebuild. The super wee is probably a couple of lbs heavier.
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Old 11-02-2016, 12:44 AM
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OZgreen69 OZgreen69 is offline
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I've check the play on mine, a M20. I can turn the drive shaft a 3/8 of an inch. And with the drive shaft removed: still a 3/8 at the gear box but a touch more a the diff.
I did it like you, wheels of the ground and checked in all gears.
My "new" M22 on my other chassis as even less free play.
Hope this help.

As RTJ mentioned a look at Autogear or Medatronic web sites can be interesting!
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