Mulestang

Coasting off throttle between 30-35 mph, if I tap the gas pedal, I hear a slight clunk coming from underneath the truck. Where should I start...U-joints?

bourgeois1269

Might be your slip-yoke that needs to be greased

Man from Mars

How many miles on your drivetrain? Could be u-joints.

bourgeois1269

Man from mars might be right about the Ujoints

Prof

What is a slip yoke and how does one grease it?

bourgeois1269

Do you have a one piece drive shaft ?

bourgeois1269

Just google it, how to grease slip yoke on (whatever yr,make and model)

screamineagle

This^. Google will tell you all you need to know, basically drop the driveshaft, apply grease to the splines and reinstall. It's a stupid easy procedure

Mulestang

Haven't gotten under the truck yet, but I did learn this: it only happens when I have my Edge set to level 2. When I return the truck to stock, it goes away. On level 2, the slightest touch on the accelerator instantly brings it out the clunk.