Juicifer21

The tapered ball joints on the cast aluminum and stamped steel are larger than the ball joints on the cast steel. You can buy adapter sleeves for the cast steel control arms ball joints to fit a cast aluminum/stamped steel truck’s knuckle (spindle) but it won’t work the other way around because the ball joints are bigger. The cast steel trucks have smaller holes on the knuckles for smaller ball joints. Though if you replace the large ball joint on a cast aluminum/stamped steel control arm with the smaller ones from the cast steel it will work if you’re trying to convert. So cast aluminum/stamped steel= big ball joint and big drilled tapered hole on knuckle, cast steel= small ball joints and holes.