knocking noise while drive

[H2Miami]

Hi guys

Ive notice a knocking noise , it comes from the floor underneath while drive , I was reading that may be the mounts for the exhaust are broken or a problem with the shaft .
It is intermittent , most common while passing around the 45-50 mpg range

I will check the exhaust
Please any advise how to check if there is a issue with the shaft before taking it to the dealer

Any other thing to check ?

Thank you all

[iwillnc]

Does it come about during High RPM?

Or over 50 mph it's constant?


I have a rattle in my passenger floorboard that sometimes sounds always above 4500 RPM.


If nothing else you can put the truck into neutral with the park brake engaged and try to shake the shafts.

In which direction does it sounds like it's coming from?
And your sure it's a knocking and not a clicking?

[H2Miami]

Originally Posted by iwillnc

Does it come about during High RPM?

Or over 50 mph it's constant?


I have a rattle in my passenger floorboard that sometimes sounds always above 4500 RPM.


If nothing else you can put the truck into neutral with the park brake engaged and try to shake the shafts.

In which direction does it sounds like it's coming from?
And your sure it's a knocking and not a clicking?

It is a knocking noise like bump,bump,bump ... as if something is knocking on the floor
it is intermittent around 45-50 mph but not always does it ...

I dont think it is related with stopping or accelerating , either with turning ...
Also I can feel the bumping in my foot ... The sequencing is around 3-4 bumps per second

I will try to do a shake test to the shaft

Thanks

[Easy Ed]

Body Mounts Maybe ?

http://www.elcovaforums.com/forums/s...ad.php?t=40794

Ed

[H2Miami]

HI Ed

I will check all the mounts , also the skid plate , I will post after the check

[HummerJim]

Originally Posted by Easy Ed

Body Mounts Maybe ?

http://www.elcovaforums.com/forums/s...ad.php?t=40794

Ed

+1 several early posts when the H2 came out of knocking noises under the floorboard and warranty fixes with new body mounts. I think AM General had two or three bad batches of them.

[BUNNY15]

I had the same issue and mine was the driver's side wheel hub...problem solved and haven't heard a peep since February.