How do I accurately re-attach rear axle lower link upper mount?

[RidingDirty]

Hey I am doing some frame repair because the bottom half of my frame has severe rust on the inside. This has caused the bottom half of my frame rail to have areas that are fairly thin and has several small holes. I believe I need to remove the rear lower link upper mount to weld in new steel and then re-attach the link mount. I'm just uncertain of how to accurately re-attach the link mount so it aligns exactly as before. I'm worried it's going to be slightly off its original location and will cause my rear axle to not be completely straight. I understand that there are (3) axis to align to (X, Y, Z) and I'm starting to think I might ruin my rear axle alignment. The other (3) links will still be attached during this process, so maybe the axle won't move as much as I'm thinking and I can just swing the lower link in place, weld the link mount in and call it a day. I've called around to some local places that do frame repair and they have given me (2) basic recommendations.

1. Take some measurements and try your best.
2. Use a tram gauge.

However, none of the businesses have any availability at the time. So I'm thinking of calling a mobile welder to stop by my house. I'm thinking of buying a tram gauge and taking a bunch of measurements, but i think I'm psyching myself out and getting overwhelmed that I might screw it up. Has anyone had to re-attach that link? What was your method to re-align it to the correct position? Are there any tolerances? Please let me know. Any help will be appreciated. Thanks.

 

[NachesPass4x4]

I haven't worked with links before but I've moved alot of leaf spring mounts and shackle hangers.

Here is one method that might work for you.

Get a metal yard stick, measure from the edge of the bolt hole on the mount, to a convenient spot on the frame and scribe a mark. This makes for an easy and precise way to measure for placing the new mount. Yard sticks arnt very accurate, so use same side every time.

If the bolt isnt sloppy in the mount, you can but the yard stick up to the bolt, lining it up with the edge of the hole for you and making it even easier.

The bushings will allow for some error, 1/16" off wont hurt anything. How much you can go past that I dont know.

If you can make precise and repeatable measurement before moving the mount, you should be good.

 

[phattyduck]

These may also help:

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-Charlie