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Old 01-18-2019, 01:48 PM   #1
oifish
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Default Where to measure driveshaft

I'm looking to replace my u-joints, and I'd like to get Moog parts (unless anyone has better options?). Moog has 2 selections 3.5" yoke OD (Part #280) and 3.25" yoke OD (part #344). Am I just measuring the driveshaft itself to get that measurement or is there somewhere else to get the correct diameter?
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Old 01-18-2019, 04:20 PM   #2
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We'll since they say the yoke size...

But I think the bigger around driveline takes the bigger u-joint. In a 240 anyway, you didn't say what car or year..
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Old 01-18-2019, 07:14 PM   #3
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There are really only three standard auto sized U-joints.



1210, 1310 and 1330

All volvos are either 1210 or 1310 and there is a pretty obvious difference.

One lesion I learned in my journey is that the circlips also come in 3 thicknesses at the drive shaft balance store. The ones that come with the joint will probably work fine but if the joint seems too tight there are thinner ones available.
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Old 01-19-2019, 12:21 PM   #4
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Quote:
Originally Posted by sbabbs View Post
We'll since they say the yoke size...

But I think the bigger around driveline takes the bigger u-joint. In a 240 anyway, you didn't say what car or year..
sorry, car is the 740 in my sig
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Old 01-19-2019, 12:36 PM   #5
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Quote:
Originally Posted by TestPoint View Post
There are really only three standard auto sized U-joints.



1210, 1310 and 1330

All volvos are either 1210 or 1310 and there is a pretty obvious difference.

One lesion I learned in my journey is that the circlips also come in 3 thicknesses at the drive shaft balance store. The ones that come with the joint will probably work fine but if the joint seems too tight there are thinner ones available.
My M47 driveshaft has 1300's on it except the end that has a 1330 that I had welded on
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Old 01-19-2019, 01:20 PM   #6
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Measure?

Buy 6 return 3, or two if a needle falls flat in the cup and gets squished.


[You'll thank me later.]
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how psi stock cna support?

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Old 01-20-2019, 02:37 PM   #7
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Measure?

Buy 6 return 3, or two if a needle falls flat in the cup and gets squished.


[You'll thank me later.]
ha fair enough. Advance auto is close by and sells Moog.
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Old 01-20-2019, 03:16 PM   #8
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And don't forget to smear some nasty black bearing grease on the rollers, so they don't drop out of their factory chicken fat 'grease', fall into the cup to be squished, flattened slightly and become a "maybe it's still good maybe it's not".



To answer your actual question since nobody seems to know:

As far as measuring it's a width or cup to cup measurement, you can zero your calipers on a couple small nuts set them on the cups [to clear the yoke] and then measure the difference without removing the U joint .

Last edited by Redwood Chair; 01-20-2019 at 05:34 PM..
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