rear suspension

[cudaClive]

What is the best way to lower the rear suspension on a '70 'cuda? My car sits a little to high at the back, I would like to lower it 2 or 3 inches. The rear suspension is all stock, at the moment. Any help would be appreciated.

[72bluNblu]

Welcome!

Based on how high the car is sitting in the back, I would have to say I doubt those are stock rear leaf springs. Maybe XHD's or super stocks, but not stock. Also, if the springs are new, they will settle in as the car is driven.

If the springs aren't new, the best way to lower the back of the car would be different rear springs. Hotchkis makes a rear leaf that lowers the car about ~1" in the back from stock (your car is sitting higher than stock!). ESPO makes springs to lower the car as well, the amount of drop can be specified.

[the_engineers]

If you're happy with the ride, add lowering blocks. Easier to fine tune the height...

[Tom Quad]

Lowering blocks are bad advice...but go ahead, it's your car.
Good leaf springs when new do not "settle".
De-arching the spring is not the best idea either.
Based on the photo it appears those tires will not fit in the wheel wells so there will be other issues. The tires should fit "in" the wheel wells unless you think it's still 1971.

You can replace the current springs with a flatter spring. If you decide to go with new springs call ESPO. Quality products great customer service at a reasonable price! If you go with the 6 leaf springs which come in at about 160lbs/inch static rate [which is very good for these cars] you will still need the adjustable front spring eye to get the car down on the tires where it belongs.  Lowering the back of the car increases the caster in a positive direction.

If the springs are in good shape and do not need new inner liners etc a better, less expensive idea is to buy the adjustable style front spring eye hanger from firm feel.     

Ideally the top of the tire will be 1/4 inch lower than the edge of the wheel well
As i said before it's your car so you get to choose what to do...but maybe now you have some better information to make a better choice.

[the_engineers]

What's wrong with lowering blocks? They allow precise selection of ride height and they allow you to fix/fine tune pinion angle.
Your advice has him buying another set that may or may not give him the same ride quality.

[heminut]

The original springs were designed to be flat or almost flat with the full weight of the car on them at normal ride height. If your springs have much curve to them when sitting on all 4 tires then you probably have XHD or S/S springs. I agree with 72blunblu, in the pic your car looks like it has non-stock springs.