Installing a new rear end and super stock springs in a 67 Barracuda. The axle seems to be rotated so its higher in the front than the rear. Shouldn't it be the other way? Did I somehow install the springs backward? It doesn't seem right.
Axle rotation
- Thread starter Orange67
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pishta
I know I'm right....
Looks way wrong unless the trans is pointing down the same amount (5 degrees more!) off horizontal Is should actually point down a little. Technically it should be about -5 degrees under the output shaft angle of the transmission so when the rear wraps up under load (pinion goes up), the pinion angle equals that of the trans output shaft. If your output shaft is down -3 degrees, your pinion should be down about -2 so when it wraps up under load, it ends up at +3...+3+(-3)=0. Note last part about preload.
super stock springs are more firm than stocker so this -5 may be a little generous.
super stock springs are more firm than stocker so this -5 may be a little generous.
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You can change the pinion angle with axle shims, easy fix.
DJM Suspension Pinion Angle Shims ACC-6PSK
DJM Suspension Pinion Angle Shims ACC-6PSK
Ok thanks. The Right Stuff brake instructions are not so great.
pishta
I know I'm right....
yeah, see if you can swap sides. I dont think the bleeder can accept the pressure line with that caliper. bummer
No, there's only one way to install them.
Have you tried the rear end without the lowering blocks? They might be causing your pinion angle to be off.
I'll take a look at that. It's just so much higher than I thought it would be. This pic is with the lowering blocks.
67Dart273
Well-Known Member
I'll tell ya something buddy. WHERE did you get those springs? Having high arched springs and then having to use that much lowering block is NO WAY to build a car. OldManMopar pointed this very thing out the other day.....lowering blocks create leverage against the spring, and torque on the axle is going to cause magnified rotation under power.
Where did you buy the springs and were they a b!tch to install?
Professor Fate
Push the button, Max...
Large lowering blocks can play hell with pinion angles and reaction distances, as well as movement. As the rear wraps up on launch, it can actually move rearwards- the pivot point is actually where it mounts to the spring, so when it tries to rotate it rotates around the axis of the mount; in this case the bottom of the lowering blocks; moving the whole axle housing rearwards. Along with the pinion rotation, this can effectively move your rear u joint backwards several inches. Housing movement can cause havoc with rear tire to wheel well clearance, especially if you factor in tire growth into the mix. Pinion/u joint movement can pull your slip yoke rearward, and if you have a couple inches of movement, I wouldn't trust slip joint engagement- especially if you get ANY amount of wheel hop. And the taller the blocks, the more exagerated the movement is.
You've gotta get that rear end under control to limit movement- snubber/bars whatever.
Ideally get some springs with less arch and dump the lowering blocks.
Well, I see 67Dart273 beat me to the punch- I type too slow...
What's the rear shackles look like?
Summit lists them as fitting a bodies?
Mopar Performance Competition Leaf Springs P3690461
Mopar Performance Competition Leaf Springs P3690461
Professor Fate
Push the button, Max...
Your first pic looks like you've got some frame rust issues to deal with before you go any further, too.
33IMP
Well-Known Member
Those springs have got to GO! (Are they both the same number?) And your disc calipers are on the wrong side, as said before. Air in a brake system floats to the top. You will NEVER bleed the air out with the bleeder on the bottom.
getting interesting now. need to pull them and measure
If you still have your old springs, measure the length on them. Compare to the new ones.
I bought them from another guy who had a Barracuda also...I looked up the number and other people seemed to have installed these in A bodies before so I thought it would be OK. Its just not right though and has taken me so much time to fit. It doesn't seem like they are long enough either. The rear shackles aren't at the right angle. Other people have said the springs will relax over time when I show them pics but I don't think so anymore. Anyone have some standard height springs they want to sell? Heh.
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