strange vibration

[WHITE LIGHTNIN]

truck is making strange vibration sound when it is on and is in drive, reverse, first and second gears. Cant hear it when im moving, only when im sitting still in the driveway or what not. It doesnt make this noise when truck is in neutral or park. You guys got any suggestions on what this is? It sounds like it is coming from the back of the truck. Any suggestions at all will be appreciated. Thanks.


White '94 #4000 of 4007

1.7 roller rockers
Mallory hyfire ignition
ASP underdrives
K&N filter
Bassani shorties
15.20 @ 88.76

 

[RTRUCK]

If it is intermitten and really loud, it could be the mufflers rattling. Mine has been doing it for 3 years!!!

Does it still have stock exhaust?

 

[MO351]

I'd check your heat sheilds on the exhaust. They like to vibrate. I cut a bunch of mine off that were vibrating. Also are your mufflers the original one? The baffles inside like to fall apart after quite a few miles.

 

[WHITE LIGHTNIN]

Yes I still have stock exhaust, and it probably is the pipes or mufflers rattling. Thanks guys. I worry too much!


1.7 roller r's
Mallory ignition
ASP underdrives
K&N filter
Bassani shorties
15.20 @ 88mph