Firming up ride

[88cscb]

Moog 5379 on the rear

 

[pontiacgp]

if you are going to stick with the double pig tail springs then I would go with the highest spring rating - moog 5391. I wanted a higher spring rate so I went with an open ended spring so I could trim the spring which raises the spring rate. I use the F body rear spring isolator to seat the open ended spring

 

[1979elky]

I used the Moog 5860 springs, cut a half a turn, it sat the same as the stock v-6 springs (now a 350 V-8) but rode a lot better, handled a ton better, no longer mushy or wandering all over the road. Best improvement I've made to my car so far.