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Old 11-23-2013, 08:08 AM
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welding new axle perches?

I have old rear (template). My new rear needs perches and shock mts. what would be the easiest to duplicate, out side by side or should I tack and install w/leafs etc? I have open rear and if I recall 3 degree to 7 degree angle.

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Old 11-23-2013, 08:13 AM
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Best way is to fit-up the brackets to the axle with the suspension bolted to the vehicle.

But that may not be the easiest.
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Old 11-23-2013, 10:21 AM
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If you have the original rear end and the pinion angle is correct when it is installed then use it as your guide. Take it out and set the pinion exactly horizontal. Then measure the angle of the spring perches and install the spring perches on the new rear end at the exact same angle. Same thing with the shock mounts. I have a note book full of angles and measurements that I have taken from many different rear ends so that I can build new rear ends and get them right the first time without having a rear end to measure off of.
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Old 11-23-2013, 11:18 AM
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like lakeroadster said bolt up your suspension, set the pinion angle and tack the perches.
you could weld them in the car, i removed my axle, finished welding them, cleaned up the welds and painted them

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Old 11-23-2013, 10:37 PM
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excellent job, yes me and my son (mech engineer) this week will duplicate to perfection. thanks for all the aevice.
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Old 11-24-2013, 08:12 AM
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But, one more vote for mocking it all up in position rather than exact duplication, with all due respect...reason being the variables often present in a hot-rod type vehicle. It would be your chance to be sure the trans output and the pinion shaft are pointed at each other at ride height (actually they should be "nearly" parallel with the deviation that the pinion points down a little so that it later lines up under power, and an inch or so out-of-plane w/ each other to give the u-joints just a little movement so the roller bearings don't groove in) and to do any other checking, such as seeing that the distance between the perches really is where the springs want to settle and the shock bolts are actually perpendicular to the line the shocks are on, etc.

I do hate getting something all welded up, and then bolting it in and finding that something's not right for what ever reason.
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