Loud bang happening sometimes, on truck

[Frylock]

Im getting a loud bang that I can feel with my 73 C20 that I cant pinpoint. Its coming toward the back like right under me. Could it be the leaf spring be doing it? usually does it while Im turning really hard and flexing a tiny bit, like going up the driveway. Everything looks perfect under the truck....

[chuckanut105]

Check your leaf spring bolts. The one in the middle of the leaf pack they do break once and awhile.

[Frylock]

thanks! will do.

Was redoing the fuel lines and found one leaf hanger had a bolt almost completely backed out. That wasnt the problem though cause its still doing it and I cranked them all down tight.

[chuckanut105]

[quote="Frylock"]thanks! will do.

Was redoing the fuel lines and found one leaf hanger had a bolt almost completely backed out. That wasnt the problem though cause its still doing it and I cranked them all down tight.[/quote]

Ya that could be your problem too.

[Desert Dog]

Do you have a locker in the rear?

Old Detroits (pre-2004 I believe) are brutal on the street.

Or worse, GM started using the dreaded "Gov Lock" in 73 trucks which were very bad about doing what you describe.

[confirmer]

I had the same problem before. And yes its was the leaf spring bolt that cam loose. After re tightening it strange sound disappeared. I also instead o sulee suspension cushion. It added more damping cushion to the leaf spring.