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Uni-joint tool

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Old Jul 28, 2022 | 10:42 PM
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In my rush to reassemble my trailing arms and put everything back on the car,
I forgot to take measurements of the half shaft flange sizes so i can make a holding fixture to press in the new joints when (if) I do my diff swap.
The existing joints felt fine when I had a feel of them, no noise or roughness in their movement, so they were left for now.

So can somebody please measure the following dimensions for me?

Bolt hole spacing -
Bolt hole diameter (yes i know it's 3/8"unf bolt, but clearance size) -
Diameter of main ring -

Yes i could buy something and ship it down here, but the weight makes it not an option....
and besides, I have access to lathes n mills in my job as toolmaker, could knock it up in my lunch break.

I found a 3D model online long time ago, but don't trust the sizes as the spindle mount model was wrong, bolt holes not correct.
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Old Jul 29, 2022 | 06:05 AM
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Will this help? I can get better pictures next week if needed. The depth of the center machined circle is 0.101




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Old Jul 29, 2022 | 08:17 AM
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You are overthinking this. Put the flange on the piece of stock you are fabricating and trace the 4 holes. Drill the holes 1/4” larger than the flange holes. Slip washers between the flange and the plate to fill the gap. Done.
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Old Jul 29, 2022 | 10:41 AM
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I made mine with the bolts are one a 3.750 bolt hole circle (or spaced at 2.652" apart, square, both the axis are the same distance)
The clearance counter-bore was 2.770" (2.750 would be fine) dia, .125 deep (.100 would be fine)
It uses 7/16 bolts, or at least mine does
HIH
M




Last edited by Mooser; Jul 29, 2022 at 11:11 AM.
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Old Jul 30, 2022 | 02:32 AM
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thank's Mooser, perfect, converted to normal units, metric....

had a brain fade on the bolt sizes, don't know what made me think they were 3/8".....




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Old Jul 30, 2022 | 10:49 AM
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I tapped my 3/8-16 and bored the face, works fine. Been using it for 20 years, I just burnt out joints from some 3" shafts.



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Old Jul 30, 2022 | 07:30 PM
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See, I wasn't going completely mad (this time anyway) about the bolt size,

must have read it on one of Gary's many posts about using a jig to stop them bending.

I'll end up using 10mm which is 20thou bigger than 3/8" and 40thou smaller than the 7/16" bolt, perfect place to be.

I like to have any tools and needed jigs ready to go when i start a job so i'm not getting held up and waiting around.

Thanks Gary for confirming my sanity is still there.

Last edited by riverracer au; Jul 30, 2022 at 07:37 PM. Reason: spelling
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