2 questions:

I recently went off roading in my '04 FX4 in the So. Calif. desert. I noticed on several occasions a loud thunk from the rear of the truck. I suspect rear suspension bind.

1) Could this be a correct analysis/what else could it be?

2) Should I be concerned?

Thanks,
Tim

 

'rear suspension' consists of leaf springs and shocks. What exactly do you suspect to be binding?

 

were you turning in 4wd at slow speeds?

 

I don't know what, if any, mods you've made and how you were driving, but when I take mine to certain limits the front inboard tires tend to brush then bind on the inner fender when making a sharp turn under full compression at speed. Of course the 35" tires don't help with the OEM front suspension even w/ the Autospring leveler. The rears feel like they brush against the chassis, causing them to hop under the same conditions. When it happens I assume that the suspension has just reached its limit of travel due to my choice of tire size.

It's certainly not as bad as my Cobra's old OEM quadra-bind rear suspension.

 

Truck is totally stock. I assume the leafs may be binding due to over extension while traveling slowly over some whoops.

 

I had something similar. Ended up beinga loose body mount. JP

 

what exactly were you doing when this sound happened? could be about 36 different things...

 

Driving across the desert on uneven terrain. Couple of times on mogul type area couple of times crossing gullies.