Hello. My 1994 B4000 5 speed 4x4 single cab makes a consistent pop that seems to come from the back of the truck.

Whenever I take off in 1st there is a pop. When I shift through the gears every time I get back on the gas after shifting there is a pop. It is not immediate, the pop wont happen unless I press the throttle more than lightly.

The pop happens sometimes if I am slowing down with the brakes.

I have replaced the last ujoint, greased the driveshaft splines, and installed a new transmission mount. The pop is still present. I stopped using the parking break and it still makes the noise.

 

The noise is coming from the double cardan at the front of the rear driveshaft. Ordered parts to fix already. Should be fun.