I don't have any experience with that brand but the pacbrake springs I had went in the trash. They wouldn't idle well and wouldn't run well over 3k. When I pulled them I actually measured them ,both springs od the same size should measure the same height , none of them were close. They should be ground to sit flat on the base, none of them did that. I bought some good springs from Farrell Diesel, set them up once and no more issues.
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1996 3500 4x4 5spd
1991 D350 5spd
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