When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I really need some help here... Just got done picking up a core, replacing all steels, frictions, molded pistons, seals, 3pc bearings, worn bushings etc... only modifications include internal dual feeding, converter drainback hole .25", line to lube hole .055", direct drum hole .060" extreme automatic's billet RMVB, Line pressure held constant at 185psi. Brand new Jake's Performance 4000 stall SDBC, converter clearance checked during installation. About 200 miles since installation, trans has yet to skip a beat. Shifts just as firm as I hoped, and lets you know when you put it in reverse and in gear. No gear slippage whatsoever. Only issue is this noise. Seems to get worse as trans gets up to temp, and doesn't seem to follow engine rpm, but vehicle speed. Completely gone when at a stop. Also, have had the transmission dipstick shoot me a few times when checking fluid level when hot. I have since removed some fluid and got level spot on when at 150 deg (Not brave enough to check level at 200 deg again). If anyone has any idea what this sound could be please help me out. Trans tunnel is gutted, making the noise very apparent. Seems to be coming from middle to back of trans.
Damn thats my fault, shoulda emphasized that this sound isn't apparent at WOT due to exhaust noise, but at part throttle/decel. After I give it the beans for a second, you can immediately hear a slight ticking noise/ mechanical whir for the rest of the duration of the video (I promise it is not header tick, but coming from the trans). Right before I come to a complete stop at the end of the video, the ticking slows down and begins to sound like rotational metal grinding around the 16 second mark, and that grinding/squeaking sound slows until it is completely gone when I come to a stop. I have yet to take it out of the garage after taking this video, but if y'all can't hear what I'm talking about still just let me know and ill get a better video showcasing the noise.
That’s a pretty good guess. The noise seems to follow output shaft speed. Firstly, how could I tell whether or not the pawl is loose (preferably by dropping the pan only)? I checked that the prawl engaged with the trans on the bench, and didn’t notice it dragging on the rear planet when spinning the output shaft in neutral, but definitely a possibility. If this and the driveshaft are not the culprit, can anyone list the components that follow the speed of the output shaft at all times off the top of their head? Noise does not change based on gear, only vehicle mph. By the way, I drove past a building, and could hear the sound extremely clearly, and it has gotten much louder over the last few miles, beginning to become concerned.
Last pic I got before putting the pan on btw (probably not helpful, but sure is pretty)
Update: After inspecting the driveline, my e-brake cable has been rubbing the driveshaft, with what seems to be with good amount of force. This should account for the low speed metal rubbing/grinding noise. Not only that, but the driveshaft balance weight also contacts the cable (I can see the paint coming off the corner), which should account for the ticking noise. I plan on going with a 15” wheel conversion soon to get the power to the ground better, so e-brake’s gotta go regardless. I’ll update thread to confirm that noise is gone and was not a transmission issue. Thanks for the help everyone!
4l80e Noise After Fresh Build (With Video) 
