Noise when accelerating?

So today I noticed when accelerating I hear what sounds like a quick rubbing noise from the middle of truck. It’s a 4 speed. Looked underneath don’t see anything leaking from trans or transfer case. Checked trans fluid was on the money. It only makes this rubbing noise when accelerating then goes away in a second.


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If you dont see anything obvious underneath, Grease your u-joints. Most likely cause of weird sounds on acceleration. Grease may be too late, though. You may need a new u-joint already

I just jumped my a&e terminals on the Tcm and I’m getting fault code 37 I believe. Flashes 1,2 3 times then 3,7 three times then 1,2 2 or 3 more times what needs to be replaced with a 37 fault code?


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Code 37 reads: "Torque Converter Clutch (TCC) brake switch stuck ON"

You want to get the troubleshooting manual, that is a great help with the 4L80:

4L80 Troubleshooting Manual

Dpas1973 said:

I just jumped my a&e terminals on the Tcm and I’m getting fault code 37 I believe. Flashes 1,2 3 times then 3,7 three times then 1,2 2 or 3 more times what needs to be replaced with a 37 fault code?


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Don't drive with your left foot on the brake pedal. Or make sure the brake lamp switch is properly adjusted.