angle on rear shackel

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I think that is all you can get with the Alterktion front suspension , shocks are very short. I have Rancho 9 way shocks , I set them at 9 , I have tried them at 7 when the track has bad traction.

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Have you taken a video to see whats happening... 3 1/2
is pretty short for a heavier car(not a tube chassis)

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When I have the rear tires of the ground I put an angle meter on the shackel and it is pointing 7* towards the front.

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Never have the rear shackle pointing to the front, that will pull the car down as it goes past the center of the upper hangars causing the car to porpoise. Can you move the rear hangar forward with spacers or make some longer hangars? Or is the rear springs moved into the frames? If so that makes a lot easier to move the rear hangar forward I like to see at least 30 degrees shacle angle to the rear (ear spring eye closer to the bumper than the upper hangar eye is), more if possible

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Tire pressure at that time was 18 lbs M/T street radials. After I lowered the rear I got the 1.44 60 ft . I believe on that run it was around 1.51.

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When you say "lowered" are you talking tire pressure
or you lowered the rear of the car... if you can lower
the rear of the car, that would help... but what is
the tire pressure now... have you tried even lower yet

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When I put the boxes in to move the springs into the frame rails I drilled two sets of holes for the front spring eye . one in the stock location , the other two are higher in the box , which allowed me to lower the back of the car.

I have tried air pressure from 11 lbs to 22 lbs , now it likes it at 21 lbs. In the last year the engine was down on power , just last week I did a leakdown test , the cylinders were down 23% ( 150 lbs cranking pressure. I just reringed it this past week , will be going to the track this weekend. Is it possible I am not getting any rotation because the angle on the shackel is towards the front. If so I have split mono leaf springs . I can drill a new hole for the center bolt on the rear leaf to change the angle towards the rear.

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As the pinion tries to rotate up its tilting down
on the rear of the spring.... as soon as the shackle
gets to vertical it pulls the body down(which is
pulling the axle up)... do you have clamps on the
rear of the springs... if so take 1 or 2 off
You want the front of the spring STIFF but you want
the rears fairly soft

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Should never go forward of vertical...

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Let me apologize for asking such a dumb question, but if you jack the car up like the OP said he did (and I am assuming he didn't jack it up under the diff, sorry if you did), what would prevent the shackle from pointing forward? If I put mine up on jack stands, under the frame in front of the tires, I'm positive my shackles point forward too. Wouldn't the weight of the diff, with tires off the ground, cause the springs to "bow" down, pulling the shackles forward?

I have the same set up as Caper, and am trying to get the most out of my set-up too.

Thanks

gary

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Should never go forward of vertical...

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Let me apologize for asking such a dumb question, but if you jack the car up like the OP said he did (and I am assuming he didn't jack it up under the diff, sorry if you did), what would prevent the shackle from pointing forward? If I put mine up on jack stands, under the frame in front of the tires, I'm positive my shackles point forward too. Wouldn't the weight of the diff, with tires off the ground, cause the springs to "bow" down, pulling the shackles forward?

I have the same set up as Caper, and am trying to get the most out of my set-up too.

Thanks

gary

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Should never go forward of vertical...

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Let me apologize for asking such a dumb question, but if you jack the car up like the OP said he did (and I am assuming he didn't jack it up under the diff, sorry if you did), what would prevent the shackle from pointing forward? If I put mine up on jack stands, under the frame in front of the tires, I'm positive my shackles point forward too. Wouldn't the weight of the diff, with tires off the ground, cause the springs to "bow" down, pulling the shackles forward?

I have the same set up as Caper, and am trying to get the most out of my set-up too.

Thanks

gary

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When you jack up the car(frame) both sides of the
spring bow... if you are under acceleration the front
segments are trying to tip up while tipping the rears
down(front is lifting the body but also pushing down
on the diff) and now the rear segments are trying to
pull the body back down but the difference is in the
shackle, its allowing the spring to basically move
forward till its vertical ... remember its trying
to pull pull down... once it gets to vertical its
the spring is just loading it harder... not letting
it go forward