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Pulsing Pulling a Load at 50 MPH, 2,000 RPM in 4th Gear
Whenever I'm going up hill or pulling a load, my truck pulses back and forth. It almost feels like it's missing, but the engine noise doesn't change and I'm almost positive it's transmission-related. The pulsing feeling is like driving on a bumpy road, but instead of an up-and-down motion, it's a foward-and-backward motion. It pulses fairly quickly; maybe 2 times per second.
It only happens in 4th gear at around 50 mph and 2,000 rpm when I'm going uphill or pulling a load. The bigger the load, the more it pulses.
I think that's when the torque converter is supposed to lockup, but i'm not sure.
I have a POS transmission from Phoenix Hard Parts that supposedly came with a heavy-duty TC, but who knows what I actually have. I only have maybe 5k on the new tranny.
Any ideas what could be causing the pulsing sensation?
2002 Ford F-350 4x4 Lariat Crew Cab 7.3 SRW 3.73 Long Bed 265/75/16 230,000 miles